Hameg HM 1004-3 Series User manual

®
Instruments
Oscilloscope
HM 1004-3 .01/.02/.03
ENGLISH
MANUAL•HANDBUCH•MANUEL

MANUAL•HANDBUCH•MANUEL

3
Subject to change without notice
Table of contents
General information regarding the CE marking .......... 4
General Information ........................................................ 6
Symbols ......................................................................... 6
Use of tilt handle ............................................................ 6
Safety ............................................................................. 6
Intended purpose and operating conditions ................. 6
EMC ............................................................................... 7
Warranty......................................................................... 7
Maintenance .................................................................. 7
Protective Switch-Off .................................................... 7
Power supply ................................................................. 7
Type of signal voltage ..................................................... 8
Amplitude Measurements ............................................. 8
Total value of input voltage............................................ 9
Time Measurements ..................................................... 9
Connection of Test Signal ............................................ 10
Controls and Readout .................................................... 11
Menu ................................................................................ 21
First Time Operation ...................................................... 21
Trace Rotation TR ........................................................ 21
Probe compensation and use ...................................... 21
Adjustment at 1kHz ..................................................... 22
Adjustment at 1MHz ................................................... 22
Operating modes of the
vertical amplifiers in Yt mode ...................................... 23
X-Y Operation ............................................................... 23
Phase comparison with Lissajous figures .................. 23
Phase difference measurement
in DUAL mode (Yt) ....................................................... 24
Phase difference measurement in DUAL mode ........ 24
Measurement of amplitude modulation ..................... 24
Triggering and timebase .............................................. 25
Automatic Peak (value) -Triggering.............................. 25
Normal Triggering ......................................................... 25
Slope ...................................................................... 25
Trigger coupling ............................................................ 26
Triggering of video signals ........................................... 26
Line triggering (~) ........................................................ 26
Alternate triggering ...................................................... 27
External triggering ........................................................ 27
Trigger indicator “TR” .................................................. 27
HOLD OFF-time adjustment ....................................... 27
B-Timebase (2nd Timebase)/
Triggering after Delay .................................................. 28
Auto Set........................................................................... 28
St.190601-Hüb/tke
Component Tester .......................................................... 29
General ......................................................................... 29
Using the Component Tester ...................................... 29
Test Procedure ............................................................. 29
Test Pattern Displays ................................................... 29
Testing Resistors ......................................................... 29
Testing Capacitors and Inductors ................................ 29
Testing Semiconductors .............................................. 29
Testing Diodes ............................................................. 30
Testing Transistors ....................................................... 30
In-Circuit Tests ............................................................. 30
Adjustments.................................................................... 31
RS232 Interface - Remote Control ............................... 31
Safety ........................................................................... 31
Operation ..................................................................... 31
Baud-Rate Setting ........................................................ 31
Data Communication ................................................... 31
Front Panel HM1004-3 ................................................... 32

Subject to change without notice
4
Angewendete harmonisierte Normen / Harmonized standards applied / Normes
harmonisées utilisées
Sicherheit / Safety / Sécurité
EN 61010-1: 1993 / IEC (CEI) 1010-1: 1990 A 1: 1992 / VDE 0411: 1994
EN 61010-1/A2: 1995 / IEC 1010-1/A2: 1995 / VDE 0411 Teil 1/A1: 1996-05
Überspannungskategorie / Overvoltage category / Catégorie de surtension: II
Verschmutzungsgrad / Degree of pollution / Degré de pollution: 2
Elektromagnetische Verträglichkeit / Electromagnetic compatibility /
Compatibilité électromagnétique
EN 61326-1/A1
Störaussendung / Radiation / Emission: Tabelle / table / tableau 4; Klasse / Class /
Classe B.
Störfestigkeit / Immunity / Imunitee: Tabelle / table / tableau A1.
EN 61000-3-2/A14
Oberschwingungsströme / Harmonic current emissions / Émissions de courant
harmonique: Klasse / Class / Classe D.
EN 61000-3-3
Spannungsschwankungen u. Flicker / Voltage fluctuations and flicker /
Fluctuations de tension et du flicker.
Datum /Date /Date Unterschrift / Signature /Signatur
KONFORMITÄTSERKLÄRUNG
DECLARATION OF CONFORMITY
DECLARATION DE CONFORMITE
Instruments
Herstellers HAMEG GmbH
Manufacturer Kelsterbacherstraße 15-19
Fabricant D - 60528 Frankfurt
Bezeichnung / Product name / Designation:
Oszilloskop/Oscilloscope/Oscilloscope
Typ / Type / Type: HM1004-3
mit / with / avec: -
Optionen / Options / Options: -
mit den folgenden Bestimmungen / with applicable regulations / avec les
directives suivantes
EMV Richtlinie 89/336/EWG ergänzt durch 91/263/EWG, 92/31/EWG
EMC Directive 89/336/EEC amended by 91/263/EWG, 92/31/EEC
Directive EMC 89/336/CEE amendée par 91/263/EWG, 92/31/CEE
Niederspannungsrichtlinie 73/23/EWG ergänzt durch 93/68/EWG
Low-Voltage Equipment Directive 73/23/EEC amended by 93/68/EEC
Directive des equipements basse tension 73/23/CEE amendée par 93/68/CEE
27.03.2001
E. Baumgartner
Technical Manager /Directeur Technique
General information regarding the CE marking
HAMEG instruments fulfill the regulations of the EMC directive. The conformity test made by HAMEG is based on the actual generic- and product
standards. In cases where different limit values are applicable, HAMEG applies the severer standard. For emission the limits for residential,
commercial and light industry are applied. Regarding the immunity (susceptibility) the limits for industrial environment have been used.
The measuring- and data lines of the instrument have much influence on emmission and immunity and therefore on meeting the acceptance
limits. For different applications the lines and/or cables used may be different. For measurement operation the following hints and conditions
regarding emission and immunity should be observed:
1. Data cables
For the connection between instruments resp. their interfaces and external devices, (computer, printer etc.) sufficiently screened cables must be
used. Without a special instruction in the manual for a reduced cable length, the maximum cable length of a dataline must be less than 3 meters
and not be used outside buildings. If an interface has several connectors only one connector must have a connection to a cable.
Basically interconnections must have a double screening. For IEEE-bus purposes the double screened cables HZ72S and HZ72L from HAMEG are
suitable.
2. Signal cables
Basically test leads for signal interconnection between test point and instrument should be as short as possible. Without instruction in the manual
for a shorter length, signal lines must be less than 3 meters and not be used outside buildings.
Signal lines must screened (coaxial cable - RG58/U). A proper ground connection is required. In combination with signal generators double
screened cables (RG223/U, RG214/U) must be used.
3. Influence on measuring instruments.
Under the presence of strong high frequency electric or magnetic fields, even with careful setup of the measuring equipment an influence of such
signals is unavoidable.
This will not cause damage or put the instrument out of operation. Small deviations of the measuring value (reading) exceeding the instruments
specifications may result from such conditions in individual cases.
4. RF immunity of oscilloscopes.
4.1 Electromagnetic RF field
The influence of electric and magnetic RF fields may become visible (e.g. RF superimposed), if the field intensity is high. In most cases the
coupling into the oscilloscope takes place via the device under test, mains/line supply, test leads, control cables and/or radiation. The device under
test as well as the oscilloscope may be effected by such fields.
Although the interior of the oscilloscope is screened by the cabinet, direct radiation can occur via the CRT gap. As the bandwidth of each amplifier
stage is higher than the total –3dB bandwidth of the oscilloscope, the influence RF fields of even higher frequencies may be noticeable.
4.2 Electrical fast transients / electrostatic discharge
Electrical fast transient signals (burst) may be coupled into the oscilloscope directly via the mains/line supply, or indirectly via test leads and/or
control cables. Due to the high trigger and input sensitivity of the oscilloscopes, such normally high signals may effect the trigger unit and/or may
become visible on the CRT, which is unavoidable. These effects can also be caused by direct or indirect electrostatic discharge.
HAMEG GmbH

5
Subject to change without notice
Accessories supplied:
Line Cord, Operators Manual on CD-ROM, 2 Probes 10:1
Analog Oscilloscope HM1004-3 (100MHz)
Autoset, Save / Recall, Readout / Cursor and RS-232 Interface
Specifications
Vertical Deflection
Operating modes: Channel I or II separate,
Channel I and II: alternate or chopped
Chopper Frequency: approx. 0.5MHz
Sum or difference: from CH I and CH II
Invert: both channels
XY-Mode: via channel I (Y) and channel II(X)
Frequency range: 2x DC to 100MHz (-3dB)
Risetime: <3.5ns
Overshoot: ≤1%
Deflection coefficients: 14 calibrated steps
1mV to 2mV/div.: ±5% (DC – 10MHz (-3dB))
5mV/div. to 20V/div.: ±3% in 1-2-5 sequence,
with variable 2.5:1 up to 50V/div.
Input impedance: 1MΩII 15pF.
Input coupling: DC-AC-GD (ground).
Input voltage: max. 400V (DC + peak AC).
Delay line: approx. 70ns
Triggering
Automatic (peak to peak): ≤20Hz-200MHz (≥0.5div.)
Normal with level control:DC-200MHz (
≥
0.5div.)
Indicator for trigger action: LED
Slope: positive or negative
Sources: Channel I or II,
line and external.
ALT. Triggering: CH I/CH II (≥0.8div.)
Coupling:
AC (10Hz – 200MHz),
DC (0 to 200MHz), HF (50kHz – 200MHz),
LF (0 to 1.5kHz), NR(noise reject):0-50MHz (
≥
0.8div.)
Triggering time base B:normal with level
control and slope selection (0 – 200 MHz)
Active TV Sync. Separator: field & line, +/ –
External: ≥0.3Vpp (0 – 100MHz)
Horizontal Deflection
Time base A: 22 calibrated steps (±3%)
from 0.5s/div. – 50ns/div. in 1-2-5 sequence
variable 2.5:1 up to 1.25s/div.,with
X-Mag. x10: 5ns/div. (±5%)
Holdoff time: variable to approx. 10:1
Time base B: 18 calibrated steps (±3%)
from 20ms/div. to 50ns/div. in 1-2-5 sequence
Operating modes: A or B, alternate A/B
Bandwidth X-amplifier: 0 to 3MHz (-3dB)
Input X-amplifier: via Channel II
Sensitivity: see Ch II
X-Y phase shift: <3° below 220kHz.
Operation / Control
Manual (front panel switches)
Auto Set (automatic parameter selection)
Save/Recall: 9 user-defined parameter settings
Readout: Display of parameter settings
Cursor measurement: ∆V, ∆t or ∆1/t (frequ.)
Remote control: with built in RS-232 interface
Component Tester
Test voltage: approx. 7Vrms (open circuit).
Test current: approx. 7mArms (shorted).
General Information
CRT: D14-375GH, 8x10div., internal graticule
Acceleration voltage: approx 14kV
Trace rotation: adjustable on front panel
Calibrator:
0,2V ±1%, ≈ 1kHz/1MHz (t
r
<4ns)
Line voltage: 100-240V AC ±10%, 50/60Hz
Power consumption: approx. 38 Watt at 50Hz
Min./Max. ambient temperature: 0°C...+40°C
Protective system: Safety class I (IEC1010-1)
Weight: approx. 5.9kg. Color: techno-brown
Cabinet: W 285, H 125, D 380 mm
Subject to change without notice. 08/00
This microprocessor controlled oscilloscope has been designed for a wide
multitude of applications in service and industry. For ease of operation the
„Autoset“ function allows for signal related automatic setup of measuring
parameters. On screen alphanumeric readout and cursor functions for
voltage, time and frequency measurement provide extraordinary operational
convenience. Nine different user defined instrument settings can be saved and
recalled without restriction. The built-in RS-232 serial interface allows for
remote controlled operation by a PC .
The outstanding features of the HM1004-3 include two vertical input channels
and the second time base with the ability to magnify, over 1000 times, extremely
small portions of the input signal. The second time base has its own triggering
controls, including level and slope selection,to allow a stable and precisely
referenced display of asynchronous or jittery signal segments. The trigger circuit
is designed to provide reliable triggering to over 200MHz at signal levels as low
as 0.5div.. An active TV Sync Separator for TV-signal tracing ensures accurate
triggering even with noisy signals. Signals are solid and distortion free even at
the upper frequency limit. The built in Y delay line allows for leading edge display
of even low repetition rate signals, supported by the 14kV CRT with its high
intensity. Both instruments are equipped with a built in COMPONENT TESTER.
Because it is so important to be able to trust the accuracy of the display when
viewing pulse or square signals, the HM1004-3 has a built-in switchable
calibrator, which checks the instrument’s transient response characteristics -
from probe tip to CRT screen. The essential high frequency compensation of
wide band probes can be performed with this calibrator, which features a rise
time of less than 4ns.
The instrument offers the right combination of triggering control, frequency
response, and time base versatility to facilitate measurements in a wide range
of applications - in laboratory as well as in field service use. It is another example
of HAMEG’s dedication to engineering excellence.
2 Channels, 1mV – 20V/div, Delay Line, 14kV CRT
Time Base A: 0.5s – 5ns/div., B: 20ms–5ns/div. , 2nd Trigger
Triggering DC–200MHz, Automatic Peak to Peak,
Alternate Trigger, Calibrator and Component Tester

Subject to change without notice
6
General Information
This oscilloscope is easy to operate. The logical arrangement
of the controls allows anyone to quickly become familiar with
the operation of the instrument, however, experienced users
are also advised to read through these instructions so that all
functions are understood.
Immediately after unpacking, the instrument should be
checked for mechanical damage and loose parts in the
interior. If there is transport damage, the supplier must be
informed immediately. The instrument must then not be put
into operation.
Symbols
ATTENTION - refer to manual
Danger - High voltage
Protective ground (earth) terminal
Use of tilt handle
To view the screen from the best angle, there are three
different positions (C, D, E) for setting up the instrument. If
the instrument is set down on the floor after being carried, the
handle automatically remains in the upright carrying position
(A). In order to place the instrument onto a horizontal surface,
the handle should be turned to the upper side of the oscillo-
scope (C). For the D position (10° inclination), the handle
should be turned to the opposite direction of the carrying
position until it locks in place automatically underneath the
instrument. For the E position (20° inclination), the handle
should be pulled to release it from the D position and swing
backwards until it locks once more. The handle may also be
set to a position for horizontal carrying by turning it to the
upper side to lock in the B position. At the same time, the
instrument must be lifted, because otherwise the handle will
jump back.
Safety
This instrument has been designed and tested in accordance
with IEC Publication 1010-1 (overvoltage category II, pollu-
tion degree 2), Safety requirements for electrical equipment
for measurement, control, and laboratory use. The CENELEC
regulations EN 61010-1 correspond to this standard. It has left
the factory in a safe condition. This instruction manual con-
tains important information and warnings which have to be
followed by the user to ensure safe operation and to retain the
oscilloscope in a safe condition.
The case, chassis and all measuring terminals are connected
to the protective earth contact of the appliance inlet. The
instrument operates according to Safety Class I (three-
conductor power cord with protective earthing conductor and
a plug with earthing contact).
The mains/line plug shall only be inserted in a socket outlet
provided with a protective earth contact. The protective
action must not be negated by the use of an extension cord
without a protective conductor.
The mains/line plug must be inserted before connec-
tions are made to measuring circuits.
The grounded accessible metal parts (case, sockets, jacks)
and the mains/line supply contacts (line/live, neutral) of the
instrument have been tested against insulation breakdown
with 2200V DC.
Under certain conditions, 50Hz or 60Hz hum voltages can
occur in the measuring circuit due to the interconnection with
other mains/line powered equipment or instruments. This can
be avoided by using an isolation transformer (Safety Class II)
between the mains/line outlet and the power plug of the
device being investigated.
Most cathode-ray tubes develop X-rays. However, the dose
equivalent rate falls far below the maximum permissible
value of 36pA/kg (0.5mR/h).
Whenever it is likely that protection has been impaired, the
instrument shall be made inoperative and be secured against
any unintended operation. The protection is likely to be
impaired if, for example, the instrument
• shows visible damage,
• fails to perform the intended measurements,
• has been subjected to prolonged storage under unfavour-
able conditions (e.g. in the open or in moist environments),
• has been subject to severe transport stress (e.g. in poor
packaging).
Intended purpose and operating conditions
This instrument must be used only by qualified experts who
are aware of the risks of electrical measurement.
The instrument is specified for operation in industry, light
industry, commercial and residential environments.
Due to safety reasons the instrument must only be connected
to a properly installed power outlet, containing a protective
earth conductor. The protective earth connection must not be
broken. The power plug must be inserted in the power outlet
while any connection is made to the test device.
The instrument has been designed for indoor use. The
permissible ambient temperature range during operation is
+10°C (+50°F) ... +40°C (+104°F). It may occasionally be
subjected to temperatures between +10°C (+50°F) and -10°C
(+14°F) without degrading its safety. The permissible ambi-
ent temperature range for storage or transportation is -40°C
(-40°F) ... +70°C (+158°F). The maximum operating altitude is
up to 2200m (non-operating 15000m). The maximum relative
humidity is up to 80%.
If condensed water exists in the instrument it should be
acclimatized before switching on. In some cases (e.g. ex-
tremely cold oscilloscope) two hours should be allowed
before the instrument is put into operation. The instrument
should be kept in a clean and dry room and must not be
operated in explosive, corrosive, dusty, or moist environ-
ments. The oscilloscope can be operated in any position, but
the convection cooling must not be impaired. The ventilation
General Information

7
Subject to change without notice
holes may not be covered. For continuous operation the
instrument should be used in the horizontal position, prefer-
ably tilted upwards, resting on the tilt handle.
The specifications stating tolerances are only valid if
the instrument has warmed up for 30minutes at an
ambient temperature between +15°C (+59°F) and +30°C
(+86°F). Values without tolerances are typical for an
average instrument.
EMC
This instrument conforms to the European standards regard-
ing the electromagnetic compatibility. The applied standards
are: Generic immunity standard EN50082-2:1995 (for indus-
trial environment) Generic emission standard EN50081-1:1992
( for residential, commercial und light industry environment).
This means that the instrument has been tested to the
highest standards.
Please note that under the influence of strong electro-
magnetic fields, such signals may be superimposed on
the measured signals.
Under certain conditions this is unavoidable due to the
instrument’s high input sensitivity, high input impedance and
bandwidth. Shielded measuring cables, shielding and earthing
of the device under test may reduce or eliminate those effects.
Warranty
HAMEG warrants to its Customers that the products it
manufactures and sells will be free from defects in materials
and workmanship for a period of 2 years. This warranty shall
not apply to any defect, failure or damage caused by improper
use or inadequate maintenance and care. HAMEG shall not be
obliged to provide service under this warranty to repair
damage resulting from attempts by personnel other than
HAMEG representatives to install, repair, service or modify
these products.
In order to obtain service under this warranty, Customers
must contact and notify the distributor who has sold the
product. Each instrument is subjected to a quality test with 10
hour burn-in before leaving the production. Practically all early
failures are detected by this method. In the case of shipments
by post, rail or carrier the original packing must be used.
Transport damages and damage due to gross negligence are
not covered by the guarantee.
In the case of a complaint, a label should be attached to the
housing of the instrument which describes briefly the faults
observed. If at the same time the name and telephone number
(dialing code and telephone or direct number or department
designation) is stated for possible queries, this helps towards
speeding up the processing of guarantee claims.
Maintenance
Various important properties of the oscilloscope should be
carefully checked at certain intervals. Only in this way is it
largely certain that all signals are displayed with the accuracy
on which the technical data are based. Purchase of the
HAMEG scope tester HZ 60, which despite its low price is
highly suitable for tasks of this type, is very much
recommended. The exterior of the oscilloscope should be
cleaned regularly with a dusting brush. Dirt which is difficult
to remove on the casing and handle, the plastic and aluminium
parts, can be removed with a moistened cloth (99% water
+1% mild detergent). Spirit or washing benzine (petroleum
ether) can be used to remove greasy dirt. The screen may be
cleaned with water or washing benzine (but not with spirit
(alcohol) or solvents), it must then be wiped with a dry clean
lint-free cloth. Under no circumstances may the cleaning fluid
get into the instrument. The use of other cleaning agents can
attack the plastic and paint surfaces.
Protective Switch Off
This instrument is equipped with a switch mode power supply.
It has both over voltage and overload protection, which will
cause the switch mode supply to limit power consumption to
a minimum. In this case a ticking noise may be heard.
Power supply
The instrument operates on mains/line voltages between
100VAC and 240VAC. No means of switching to different input
voltages has therefore been provided.
The power input fuse is externally accessible. The fuse holder
and the 3 pole power connector is an integrated unit. The
power input fuse can be exchanged after the rubber connector
is removed. The fuse holder can be released by lever action
with the aid of a screwdriver. The starting point is a slot located
on contact pin side. The fuse can then be pushed out of the
mounting and replaced.
The fuse holder must be pushed in against the spring pressure
and locked. Use of patched fuses or short circuiting of the fuse
holder is not permissible; HAMEGHAMEG
HAMEGHAMEG
HAMEG assumes no liability
whatsoever for any damage caused as a result, and all warranty
claims become null and void.
Fuse type:
Size 5x20mm; 0.8A, 250V AC fuse;
must meet IEC specification 127,
Sheet III (or DIN 41 662
or DIN 41 571, sheet 3).
Time characteristic: time lag.
Attention!
There is a fuse located inside the instrument within the
switch mode power supply:
Size 5x20mm; 0.8A, 250V AC fuse;
must meet IEC specification 127,
Sheet III (or DIN 41 662
or DIN 41 571, sheet 3).
Time characteristic: fast (F).
The operator must not replace this fuse!
General Information

Subject to change without notice
8
Type of signal voltage
tions in oscilloscope measurements, the peak-to-peak volt-
age (Vpp) value is applied. The latter corresponds to the real
potential difference between the most positive and most
negative points of a signal waveform.
If a sinusoidal waveform, displayed on the oscilloscope screen,
is to be converted into an effective (rms) value, the resulting
peak-to-peak value must be divided by 2x√2 = 2.83. Con-
versely, it should be observed that sinusoidal voltages indi-
cated in Vrms (Veff) have 2.83 times the potential difference
in Vpp. The relationship between the different voltage
magnitudes can be seen from the following figure.
Voltage values of a sine curve
Vrms = effective value; Vp = simple peak or crest value;
Vpp = peak-to-peak value; Vmom = momentary value.
The minimum signal voltage which must be applied to the Y input
for a trace of 1div height is 1mVpp (± 5%) when this deflection
coefficient is displayed on the screen (readout) and the vernier
is switched off (VAR-LED dark). However, smaller signals than
this may also be displayed. The deflection coefficients are
indicated in mV/div or V/div (peak-to-peak value).
The magnitude of the applied voltage is ascertained by
multiplying the selected deflection coefficient by the vertical
display height in div. If an attenuator probe x10 is used, a
further multiplication by a factor of 10 is required to ascertain
the correct voltage value.
For exact amplitude measurements, the variable control
(VAR) must be set to its calibrated detent CAL position.
With the variable control activated the deflection sensitivity
can be reduced up to a ratio of 2.5 to 1 (please note “controls
and readout”). Therefore any intermediate value is possible
within the 1-2-5 sequence of the attenuator(s).
With direct connection to the vertical input, signals up
to 400Vpp may be displayed (attenuator set to 20V/
div, variable control to 2.5:1).
With the designations
H= display height in div,
U= signal voltage in Vpp at the vertical input,
D= deflection coefficient in V/div at attenuator switch,
the required value can be calculated from the two given
quantities:
However, these three values are not freely selectable. They
have to be within the following limits (trigger threshold,
accuracy of reading):
Type of signal voltage
The oscilloscopes HM1004-3 and HM1505-3 allow examina-
tion of DC voltages and most repetitive signals in the fre-
quency range up to at least 100MHz (-3dB) in case of
HM1004-3 or 150MHz for the HM1505-3.
The vertical amplifiers have been designed for minimum over-
shoot and therefore permit a true signal display. The display of
sinusoidal signals within the bandwidth limits causes no prob-
lems, but an increasing error in measurement due to gain
reduction must be taken into account when measuring high
frequency signals. These errors become noticeable at approx.
40MHz (HM1004-3) or 70MHz (HM1505-3). At approx. 80
MHz (HM1505-3: 110 MHz) the reduction is approx. 10% and
the real voltage value is 11% higher. The gain reduction error
can not be defined exactly as the -3dB bandwidth of the
amplifiers differ between 100MHz and 140MHz (HM1004-3);
and 150MHz and 170MHz (HM1505-3).
For sine wave signals the -6dB limits are approx.
160MHz for the HM1004-3 and 220MHz in the case of
the HM1505-3.
When examining square or pulse type waveforms, attention
must be paid to the harmonic content of such signals. The
repetition frequency (fundamental frequency) of the signal
must therefore be significantly smaller than the upper limit
frequency of the vertical amplifier.
Displaying composite signals can be difficult, especially if they
contain no repetitive higher amplitude content which can be
used for triggering. This is the case with bursts, for instance.
To obtain a well-triggered display in this case, the assistance
of the variable holdoff function or the second timebase may
be required. Television video signals are relatively easy to
trigger using the built-in TV-Sync-Separator (TV).
For optional operation as a DC or AC voltage amplifier, each
vertical amplifier input is provided with a DC/AC switch. DC
coupling should only be used with a series-connected
attenuator probe or at very low frequencies or if the measure-
ment of the DC voltage content of the signal is absolutely
necessary.
When displaying very low frequency pulses, the flat tops may
be sloping with AC coupling of the vertical amplifier (AC limit
frequency approx. 1.6 Hz for 3dB). In this case, DC operation
is preferred, provided the signal voltage is not superimposed
on a too high DC level. Otherwise a capacitor of adequate
capacitance must be connected to the input of the vertical
amplifier with DC coupling. This capacitor must have a suffi-
ciently high breakdown voltage rating. DC coupling is also
recommended for the display of logic and pulse signals,
especially if the pulse duty factor changes constantly. Other-
wise the display will move upwards or downwards at each
change. Pure direct voltages can only be measured with DC-
coupling.
The input coupling is selectable by the AC/DC pushbutton.
The actual setting is displayed in the readout with the “= “
symbol for DC- and the “~ “symbol for AC coupling.
Amplitude Measurements
In general electrical engineering, alternating voltage data
normally refers to effective values (rms = root-mean-square
value). However, for signal magnitudes and voltage designa-

9
Subject to change without notice
Type of signal voltage
Hbetween 0.5 and 8div, if possible 3.2 to 8div,
Ubetween 0.5mVpp and 160Vpp,
Dbetween 1mV/div and 20V/div in 1-2-5 sequence.
Examples:
Set deflection coefficient D= 50mV/div 0.05V/div,
observed display height H= 4.6div,
required voltage U= 0.05x4.6 = 0.23Vpp.
Input voltage U = 5Vpp,
set deflection coefficient D= 1V/div,
required display height H= 5:1 = 5div.
Signal voltage U= 230Vrmsx2
√
2 = 651Vpp
(voltage > 160Vpp, with probe 10:1: U= 65.1Vpp),
desired display height H= min. 3.2div, max. 8div,
max. deflection coefficient D= 65.1:3.2 = 20.3V/div,
min. deflection coefficient D= 65.1:8 = 8.1V/div,
adjusted deflection coefficient D= 10V/div.
The previous examples are related to the crt graticule reading.
The results can also be determined with the aid of the ∆V
cursor measurement (please note “controls and readout”).
The input voltage must not exceed 400V, independent from
the polarity.
If an AC voltage which is superimposed on a DC voltage is
applied, the maximum peak value of both voltages must not
exceed + or -400V. So for AC voltages with a mean value of
zero volt the maximum peak to peak value is 800Vpp.
If attenuator probes with higher limits are used, the
probes limits are valid only if the oscilloscope is set to
DC input coupling.
If DC voltages are applied under AC input coupling conditions
the oscilloscope maximum input voltage value remains 400V.
The attenuator consists of a resistor in the probe and the 1MΩ
input resistor of the oscilloscope, which are disabled by the
AC input coupling capacity when AC coupling is selected. This
also applies to DC voltages with superimposed AC voltages.
It also must be noted that due to the capacitive resistance of
the AC input coupling capacitor, the attenuation ratio depends
on the signal frequency. For sinewave signals with frequen-
cies higher than 40Hz this influence is negligible.
With the above listed exceptions HAMEG 10:1 probes can be
used for DC measurements up to 600V or AC voltages (with
a mean value of zero volt) of 1200Vpp. The 100:1 probe HZ53
allows for 1200V DC or 2400Vpp for AC.
It should be noted that its AC peak value is derated at higher
frequencies. If a normal x10 probe is used to measure high
voltages there is the risk that the compensation trimmer
bridging the attenuator series resistor will break down caus-
ing damage to the input of the oscilloscope.
However, if for example only the residual ripple of a high
voltage is to be displayed on the oscilloscope, a normal x10
probe is sufficient. In this case, an appropriate high voltage
capacitor (approx. 22-68nF) must be connected in series with
the input tip of the probe. With Y-POS. control (input coupling
to GD) it is possible to use a horizontal graticule line as
reference line for ground potential before the measure-
ment. It can lie below or above the horizontal central line
according to whether positive and/or negative deviations
from the ground potential are to be measured.
Total value of input voltage
The dotted line shows a voltage alternating at zero volt level.
If superimposed on a DC voltage, the addition of the positive
peak and the DC voltage results in the max. voltage (DC +
ACpeak).
Time Measurements
As a rule, most signals to be displayed are periodically
repeating processes, also called periods. The number of
periods per second is the repetition frequency. Depending on
the timebase setting (TIME/DIV.-knob) indicated by the
readout, one or several signal periods or only a part of a period
can be displayed. The time coefficients are stated in ms/div,
µs/div or ns/div. The following examples are related to the
crt graticule reading. The results can also be determined with
the aid of the ∆T and 1/∆T cursor measurement (please note
“Controls and Readout”).
The duration of a signal period or a part of it is determined by
multiplying the relevant time (horizontal distance in div) by the
(calibrated) time coefficient displayed in the readout .
Uncalibrated, the timebase speed can be reduced until a
maximum factor of 2.5 is reached. Therefore any intermedi-
ate value is possible within the 1-2-5 sequence.
With the designations
L= displayed wave length in div of one period,
T= time in seconds for one period,
F= recurrence frequency in Hz of the signal,
Tc = time coefficient in ms, µs or ns/div and the relation
F= 1/T, the following equations can be stated:
However, these four values are not freely selectable. They
have to be within the following limits:
Lbetween 0.2 and 10div, if possible 4 to 10div,
Tbetween 5ns and 5s,
Fbetween 0.5Hz and 100MHz,
Tc between 50ns/div and 500ms/div in 1-2-5 sequence
(with X-MAG. (x10) inactive), and
Tc between 5ns/div and 50ms/div in 1-2-5 sequence
(with X-MAG. (x10) active).
Examples:
Displayed wavelength L = 7div,
set time coefficient Tc = 100ns/div,
required period T = 7x100x10-9 = 0.7µs
required rec. freq. F = 1:(0.7x10-6) = 1.428MHz.
Signal period T = 1s,

Subject to change without notice
10
Type of signal voltage
set time coefficient Tc = 0.2s/div,
required wavelength L = 1:0.2 = 5div.
Displayed ripple wavelength L = 1div,
set time coefficient Tc = 10ms/div,
required ripple freq. F = 1:(1x10x10-3) = 100Hz.
TV-Line frequency F = 15625Hz,
set time coefficient Tc = 10µs/div,
required wavelength L = 1:(15 625x10-5) = 6.4div.
Sine wavelength L = min. 4div, max. 10div,
Frequency F = 1kHz,
max. time coefficient Tc = 1:(4x103) = 0.25ms/div,
min. time coefficient Tc = 1:(10x103) = 0.1ms/div,
set time coefficient Tc = 0.2ms/div,
required wavelength L = 1:(103x0.2x10-3) = 5div.
Displayed wavelength L = 0.8div,
set time coefficient Tc = 0.5µs/div,
pressed X-MAG. (x10) button: Tc = 0.05µs/div,
required rec. freq. F = 1:(0.8x0.05x10-6) = 25MHz,
required period T = 1:(25x106) = 40ns.
If the time is relatively short as compared with the complete
signal period, an expanded time scale should always be applied
(X-MAG. (x10) active). In this case, the time interval of interest
can be shifted to the screen center using the X-POS. control.
When investigating pulse or square waveforms, the critical
feature is the risetime of the voltage step. To ensure that
transients, ramp-offs, and bandwidth limits do not unduly
influence the measuring accuracy, the risetime is generally
measured between 10% and 90% of the vertical pulse height.
For measurement, adjust the Y deflection coefficient using its
variable function (uncalibrated) together with the Y-POS.
control so that the pulse height is precisely aligned with the
0% and 100% lines of the internal graticule. The 10% and
90% points of the signal will now coincide with the 10% and
90% graticule lines. The risetime is given by the product of the
horizontal distance in div between these two coincident
points and the calibrated time coefficient setting. The fall time
of a pulse can also be measured by using this method.
The following figure shows correct positioning of the oscillo-
scope trace for accurate risetime measurement.
With a time coefficient of 5ns/div (X x10 magnification active),
the example shown in the above figure results in a total
measured risetime of
ttot = 1.6div x 5ns/div = 8ns
When very fast risetimes are being measured, the risetimes
of the oscilloscope amplifier and of the attenuator probe has
to be deducted from the measured time value. The risetime
of the signal can be calculated using the following formula.
tr= √ttot2- tosc2- tp2
In this ttot is the total measured risetime, tosc is the risetime
of the oscilloscope amplifier (HM1004-3 approx. 3.5ns) and tp
the risetime of the probe (e.g. = 2ns). If ttot is greater than
34ns, then ttot can be taken as the risetime of the pulse, and
calculation is unnecessary.
Calculation of the example in the figure above results in a
signal risetime
tr= √82- 3,52- 22 = 6,9ns
The measurement of the rise or fall time is not limited to the
trace dimensions shown in the above diagram. It is only
particularly simple in this way. In principle it is possible to
measure in any display position and at any signal amplitude.
It is only important that the full height of the signal edge of
interest is visible in its full length at not too great steepness
and that the horizontal distance at 10% and 90% of the
amplitude is measured. If the edge shows rounding or over-
shooting, the 100% should not be related to the peak values
but to the mean pulse heights. Breaks or peaks (glitches) next
to the edge are also not taken into account. With very severe
transient distortions, the rise and fall time measurement has
little meaning. For amplifiers with approximately constant
group delay (therefore good pulse transmission performance)
the following numerical relationship between rise time tr(in
ns) and bandwidth B (in MHz) applies:
Connection of Test Signal
In most cases briefly depressing the AUTO SET causes a
useful signal related instrument setting. The following expla-
nations refer to special applications and/or signals, demand-
ing a manual instrument setting. The description of the
controls is explained in the section “controlsand readout”.
Caution:
When connecting unknown signals to the oscilloscope
input, always use automatic triggering and set the
input coupling switch to AC (readout). The attenuator
should initially be set to 20V/div.
Sometimes the trace will disappear after an input signal has
been applied. Then a higher deflection coefficient (lower input
sensitivity) must be chosen until the vertical signal height is
only 3-8div. With a signal amplitude greater than 160Vpp and
the deflection coefficient (VOLTS/DIV.) in calibrated condi-
tion, an attenuator probe must be inserted before the vertical
input. If, after applying the signal, the trace is nearly blanked,
the period of the signal is probably substantially longer than
the set time deflection coefficient (TIME/DIV.). It should be
switched to an adequately larger time coefficient.
The signal to be displayed can be connected directly to the Y-
input of the oscilloscope with a shielded test cable such as
HZ32 or HZ34, or reduced through a x10 or x100 attenuator
probe. The use of test cables with high impedance circuits is
only recommended for relatively low frequencies (up to
approx. 50kHz). For higher frequencies, the signal source
must be of low impedance, i.e. matched to the characteristic
resistance of the cable (as a rule 50Ω). Especially when
transmitting square and pulse signals, a resistor equal to the
characteristic impedance of the cable must also be connected
across the cable directly at the Y-input of the oscilloscope.
When using a 50Ωcable such as the HZ34, a 50Ωthrough
termination type HZ22 is available from HAMEG. When
transmitting square signals with short rise times, transient
phenomena on the edges and top of the signal may become

11
Subject to change without notice
Controls and Readout
visible if the correct termination is not used. A terminating
resistance is sometimes recommended with sine signals as
well. Certain amplifiers, generators or their attenuators main-
tain the nominal output voltage independent of frequency only
if their connection cable is terminated with the prescribed
resistance. Here it must be noted that the terminating resistor
HZ22 will only dissipate a maximum of 2Watts. This power is
reached with 10Vrms or at 28.3Vpp with sine signal. If a x10
or x100 attenuator probe is used, no termination is necessary.
In this case, the connecting cable is matched directly to the high
impedance input of the oscilloscope. When using attenuators
probes, even high internal impedance sources are only slightly
loaded (approx. 10MΩII 12pF or 100MΩII 5pF with HZ53).
Therefore, if the voltage loss due to the attenuation of the
probe can be compensated by a higher amplitude setting, the
probe should always be used. The series impedance of the
probe provides a certain amount of protection for the input of
the vertical amplifier. Because of their separate manufacture,
all attenuator probes are only partially compensated, therefore
accurate compensation must be performed on the oscillo-
scope (see Probe compensation ).
Standard attenuator probes on the oscilloscope normally
reduce its bandwidth and increase the rise time. In all cases
where the oscilloscope bandwidth must be fully utilized (e.g.
for pulses with steep edges) we strongly advise using the
probes HZ51 (x10) HZ52 (x10 HF) and HZ54 (x1 and x10). This
can save the purchase of an oscilloscope with larger band-
width.
The probes mentioned have a HF-calibration in addition to low
frequency calibration adjustment. Thus a group delay correc-
tion to the upper limit frequency of the oscilloscope is possible
with the aid of an 1MHz calibrator, e.g. HZ60.
In fact the bandwidth and rise time of the oscilloscope are not
noticably changed with these probe types and the waveform
reproduction fidelity can even be improved because the probe
can be matched to the oscilloscopes individual pulse re-
sponse.
If a x10 or x100 attenuator probe is used, DC input
coupling must always be used at voltages above 400V.
With AC coupling of low frequency signals, the atte-
nuation is no longer independent of frequency, pulses
can show pulse tilts. Direct voltages are suppressed
but load the oscilloscope input coupling capacitor
concerned. Its voltage rating is max. 400 V (DC + peak
AC). DC input coupling is therefore of quite special
importance with a x100 attenuation probe which usu-
ally has a voltage rating of max. 1200 V (DC + peak AC).
A capacitor of corresponding capacitance and voltage
rating may be connected in series with the attenuator
probe input for blocking DC voltage (e.g. for hum
voltage measurement).
With all attenuator probes, the maximum AC input voltage
must be derated with frequency usually above 20kHz. There-
fore the derating curve of the attenuator probe type con-
cerned must be taken into account.
The selection of the ground point on the test object is
important when displaying small signal voltages. It should
always be as close as possible to the measuring point. If this
is not done, serious signal distortion may result from spurious
currents through the ground leads or chassis parts. The
ground leads on attenuator probes are also particularly critical.
They should be as short and thick as possible. When the
attenuator probe is connected to a BNC-socket, a BNC-
adapter, should be used. In this way ground and matching
problems are eliminated. Hum or interference appearing in
the measuring circuit (especially when a small deflection
coefficient is used) is possibly caused by multiple grounding
because equalizing currents can flow in the shielding of the
test cables (voltage drop between the protective conductor
connections, caused by external equipment connected to the
mains/line, e.g. signal generators with interference protec-
tion capacitors).
Controls and Readout
The following description assumes that the instru-
ment is not set to “COMPONENT TESTER”mode.
If the instrument is switched on, all important settings are
displayed in the readout. The LED´s located on the front panel
assist operation and indicate additional information. Incorrect
operation and the electrical end positions of control knobs are
indicated by a warning beep.
Except for the power pushbutton (POWER), the calibrator
frequency pushbutton (CAL. 1kHz/1MHz), the focus control
(FOCUS) and the trace rotation control (TR) all other controls
are electronically selected. All other functions and their set-
tings can therefore be remote controlled and stored.
The front panel is subdivided into sections.
On the top, immediately to the right of the CRT screen,
the following controls and LED indicators are placed:
(1) POWER - Pushbutton and symbols for ON (I) and OFF
(O).
After the oscilloscope is switched on, all LEDs are lit and
an automated instrument test is performed. During this
time the HAMEG logo and the software version are
displayed on the screen. After the internal test is com-
pleted succesfully, the overlay is switched off and the
normal operation mode is present. Then the last used
settings become activated and one LED indicates the ON
condition.
Some mode functions can be modified (SETUP) and/or
automated adjustment procedures (CALIBRATE) can be
called if the “MAIN MENU”is present. For further
information please note “MENU”.
(2) AUTO SET -
Briefly depressing this pushbutton (please note “AUTO
SET”) automatically selects Yt mode. The instrument is
set to the last used Yt mode setting (CH I, CH II or DUAL).
Even if alternating timebase mode or B timebase mode
was active before, the instrument is switched automati-
cally to A timebase mode. Please note “AUTO SET”.
Automatic CURSOR supported voltage measurement
If CURSOR voltage measurement is present, the CUR-
SOR lines are automatically set to the positive and
negative peak value of the signal. The accuracy of this
function decreases with higher frequencies and is also
influenced by the signal‘s pulse duty factor.

Subject to change without notice
12
Controls and Readout
In DUAL mode the CURSOR lines are related to the signal
which is used for internal triggering.
If the signal height is insufficient, the CURSOR lines do
not change.
(3) RM -
The remote control mode can be switched on or off via
the RS232 interface. In the latter case the “RM”LED is
lit and the electronically selectable controls on front panel
are inactive. This state can be left by depressing the
AUTO SET pushbutton provided it was not deactivated
via the interface.
(4) INTENS - READOUT
Knob with associated pushbutton and LEDs.
This control knob is for adjusting the A and B traces and
readout intensity. Turning this knob clockwise increases
and turning it counterclockwise decreases the intensity.
The READOUT pushbutton below is for selecting the
function in two ways.
Depending on the actual timebase mode and with the
readout (RO) not switched off, briefly pressing the
READOUT pushbutton switches over the INTENS knob
function indicated by a LED in the sequences:
A - RO - A in condition A timebase,
A - RO - B - A if alternate timebase mode is present and
B - RO - B in condition B timebase.
XY mode: A - RO - A.
Component Test: A - RO - A.
Pressing and holding the READOUT pushbutton switches
the readout on or off. In readout off condition the INTENS
knob function can consequently not be set to RO. Briefly
pressing the pushbutton causes the following sequences:
condition sequence
A timebase A - A
Alternate A/B A - B - A
B timebase B - B
XY mode A - A
Component Test A - A
Switching the readout off, may be required if interference
is visible on the signal(s). Such interference may also
originate from the chopper generator if the instrument is
operated in chopped DUAL mode.
With the exception of the letters “CT”all other READ-
OUT information is switched off in COMPONENT TEST
mode.
All INTENS settings are stored after the instrument is
switched off.
The AUTOSET function switches the readout on and
selects A timebase mode (A-LED lit). The INTENS setting
for each function is automatically set to the mean value,
if less intensity was previously selected.
(5) TR
The trace rotation control can be adjusted with a small
screwdriver (please note “trace rotation TR”)
(6) FOCUS
This control knob effects both the trace and the readout
sharpness.
(7) SAVE / RECALL
The instrument contains 9 non volatile memories. These
can be used by the operator to save instrument settings
and to recall them. This relates to all settings with the
exception of FOCUS, TR (trace rotation) and the calibrator
frequency pushbutton.
Press the SAVE pushbutton briefly to start the save
procedure. The readout then indicates the letter “S”
followed by a cipher between 1 and 9, indicating the
memory location. If the instrument settings stored in this
memory location must not be overwritten, briefly press
the SAVE or the RECALL pushbutton to select another
memory location. Each time the SAVE pushbutton is
briefly pressed the memory location cipher increases
until the location number 9 is reached. The RECALL
pushbutton function is similar but decreases the memory
location cipher until 1 is reached. Press and hold SAVE for
approx. 3 seconds to write the instruments settings in the
memory and to switch the associated readout informa-
tion (e.g. “S8”) off.
To recall a front panel setup, start that procedure by
briefly pressing the RECALL pushbutton. The readout
then indicates the letter “R”and the memory location
number. If required, select a different memory location as
described above. Recall the settings by pressing and
holding the RECALL pushbutton for approx. 3 seconds.
Attention:
Make sure that the signal to be displayed is similar to
the one that was present when the settings were
stored. If the signal is different (frequency, amplitude)
to the one during storage then a distorted display may
result.
If the SAVE or the RECALL pushbutton was depressed
inadvertently, briefly press both pushbuttons at the same
time or wait approx. 10 seconds without pressing either
pushbutton to exit that function.
Switching the instrument off automatically stores the
actual settings in memory location 9, with the effect that
different settings previously stored in this location get
lost. To prevent this, RECALL 9 before switching the
instrument off.
Attention!
Both pushbuttons have a second function if the
instrument is switched to menu operation. Please
note "MENU".
The setting controls and LED’s for the Y amplifiers,
modes, triggering and timebases are located under-
neath the sector of the front panel described before.

13
Subject to change without notice
Controls and Readout
(8) TRS
The instrument contains a trace separation function which
is required in the alternate timebase mode to separate
the B timebase trace from the A timebase in Y direction.
Consequently this function is only available in alternate
timebase mode. After the TRS pushbutton was pressed
once the LED related to that pushbutton is lit.
The Y-POS. I control knob is then operative as vertical
position control for the trace of the B timebase. The
maximum position shift is approx. +/- 4 div. Without a
change of the Y-POS. I control the trace separation
function is switched off automatically after approx. 10
seconds. The trace separation function can also be left by
pressing the TRS pushbutton.
(9) Y-POS. I - Control knob with a double function.
Y-Position channel I:
The vertical trace position of channel I can be set with this
control knob. In ADD (addition) mode both (Y-POS. I and
Y-POS. II) control knobs are active.
Y-Position B-trace in alternate timebase mode:
In alternate timebase mode, this control knob can be
used to separate the B timebase trace from the A
timebase trace. Please note TRS (8).
DC voltage measurement:
If no signal is applied at the INPUT CHI (27), the vertical
trace position represents 0 Volt. This is the case if INPUT
CHI (27) or in addition (ADD) mode, both INPUT CHI (27)
and INPUT CHII (31), are set to GD (ground) and auto-
matic triggering (AT (11)) is present to make the trace
visible. The trace then can be set to vertical position
which is suited for the following DC voltage measure-
ment.
After switching GD (ground) off and selecting DC input
coupling, a DC signal applied at the input changes the
trace position in vertical direction. The DC voltage then
can be determined by taking the deflection coefficient,
the probe factor and the trace position change in respect
to the previous 0 Volt position into account.
”0 Volt”Symbol:
The determination of the ”0 Volt”position is not neces-
sary if the readout is switched on and the software
setting ”DC Ref. = ON”is selected in the ”SETUP”
submenu ”Miscellaneous”. Then the ”⊥⊥
⊥⊥
⊥”symbol to the
left of the screen‘s vertical center line always indicates
the ”0 Volt”trace position in CHI and DUAL mode.
The ”0 Volt”position symbol (⊥⊥
⊥⊥
⊥) will not be displayed in
XY and ADD (addition) mode.
(10)Y-POS. II - Control knob.
The vertical trace position of channel II can be set with
this control knob. In ADD (addition) mode both (Y-POS. I
and Y-POS. II) control knobs are active. If the instrument
is set to XY mode this control knob is inactive and the X-
POS. knob must be used for a horizontal position shift.
DC voltage measurement:
If no signal is applied at the INPUT CHII (31), the vertical
trace position represents 0 Volt. This is the case if INPUT
CHII (31) or in addition (ADD) mode, both INPUT CHI (27)
and INPUT CHII (31), are set to GD (ground) and auto-
matic triggering (AT (11)) is present to make the trace
visible. The trace then can be set to vertical position
which is suited for the following DC voltage measure-
ment.
After switching GD (ground) off and selecting DC input
coupling, a DC signal applied at the input changes the
trace position in vertical direction. The DC voltage then
can be determined by taking the deflection coefficient,
the probe factor and the trace position change in respect
to the previous 0 Volt position into account.
”0 Volt”Symbol:
The determination of the ”0 Volt”position is not neces-
sary if the readout is switched on and the software
setting ”DC Ref. = ON”is selected in the ”SETUP”
submenu ”Miscellaneous”. Then the ”⊥⊥
⊥⊥
⊥”symbol to the
left of the screen‘s vertical center line always indicates
the ”0 Volt”trace position in CHI and DUAL mode.
The ”0 Volt”position symbol (⊥⊥
⊥⊥
⊥) will not be displayed in
XY and ADD (addition) mode.
(11)NM - AT - (SLOPE)
Pushbutton with a double function and associated NM-
LED.
NM - AT selection:
Press and hold the pushbutton to switch over from
automatic (peak value) to normal triggering (NM LED
above the pushbutton lit) and vice versa. If the LED is
dark, automatic (peak value) triggering is selected. Whether
the peak value detection in automatic trigger mode is
automatically activated or not, depends on the trigger
coupling setting (TRIG.MODE). The way the trigger point
symbol in the readout responds on different LEVEL
control knob settings indicates the situation:
1. If the trigger symbol can not be shifted in the vertical
direction when a signal is not applied or the signal
height is not sufficient, the peak value detection is
active.
2. Under the condition that the trigger point symbol
cannot be shifted in such a way that it leaves the signal
display on the screen, the peak value detection is
active.
3. The peak value detection is switched off if the trigger
point can be set outside the maximum peak values of
the signal, thus causing an untriggered signal display.
Slope selection:
Briefly pressing this pushbutton selects which slope of
the signal is used for triggering the timebase generator.

Subject to change without notice
14
Controls and Readout
Each time this pushbutton is briefly pressed, the slope
direction switches from falling edge to rising edge and
vice versa.
The current setting is displayed in the readout under item
“TR: source, SLOPE, coupling”. The last setting in A
timebase mode is stored and still active if the alternate (A
and B) or B timebase are selected. This allows for a
different slope setting regarding the B timebase if the
DEL. TRIG. function is active. The slope direction chosen
for the B timebase is indicated in the readout under “DTr:
SLOPE, coupling”.
(12)TR - Trigger indicator LED.
The TR LED is lit in Yt mode if the triggering conditions are
met. Whether the LED flashes or is lit constantly depends
on the frequency of the trigger signal.
(13)LEVEL - Control knob.
Turning the LEVEL knob causes a different trigger point
setting (voltage). The trigger unit starts the timebase
when the edge of a trigger signal (voltage) crosses the
trigger point. In most Yt modes the trigger point is
displayed in the readout by the symbol on the left vertical
graticule line. If the trigger point symbol would overwrite
other readout information or would be invisible when
being set above or below the screen, the symbol changes
and an arrow indicates in which vertical direction the
trigger point has left the screen.
The trigger point symbol is automatically switched off in
those modes where there is no direct relation between
the trigger signal and the displayed signal. The last setting
in A timebase mode is stored and still active if alternate
(A and B) or B timebase mode are selected.
This allows for a different level setting for the B timebase
if the DEL. TRIG. function is active. Under this condition
the letter “B”is added to the trigger point symbol.
(14)X-POS. - Control knob.
This control knob enables an X position shift of the
signal(s) in Yt and XY mode. In combination with X
magnification x10 this function makes it possible to shift
any part of the signal on the screen.
(15)X-MAG. x10 - Pushbutton and LED.
Each time this pushbutton is pressed the x10 LED located
above is switched on or off. If the x10 LED is lit, the signal
display in all Yt and timebase modes is expanded 10 fold
and consequently only a tenth part of the signal curve is
visible. The interesting part of the signal can be made
visible with aid of the X-POS. control. As the X expansion
results in a higher timebase speed (lower time deflection
coefficient), all time and frequency relevant information in
the readout is switched over.
Please note that in alternate timebase mode the inten-
sified sector may become invisible due to the X posi-
tion setting.
This pushbutton is not operative in XY mode.
(16) VOLTS/DIV.
This control knob for channel I has a double function.
The following description relates to the input attenuator
function (VAR LED dark).
Turning the control knob clockwise increases the sensi-
tivity in a 1-2-5 sequence and decreases it if turned in the
opposite direction (ccw.). The available range is from
1mV/div up to 20V/div. The knob is automatically switched
inactive if the channel related to it is switched off, or if the
input coupling is set to GD (ground).
The deflection coefficients and additional information
regarding the active channels are displayed in the readout,
e.g. “Y1: deflection coefficient, input coupling”. The “:”
symbolizes calibrated measuring conditions and is re-
placed by the “>”symbol in uncalibrated conditions.
(17)CH I - VAR. - Pushbutton with several functions.
CH I mode:
Briefly pressing the CHI button sets the instrument to
channel I (Mono CH I) mode. The deflection coefficient
displayed in the readout indicates the current conditions
(“Y1...”). If neither external nor line (mains) triggering
was active, the internal trigger source automatically
switches over to channel I (“TR:Y1...”). The last function
setting of the VOLTS/DIV (16) knob remains unchanged.
All channel I related controls are active if the input (27) is
not set to GD (29).
VAR.:
Pressing and holding this pushbutton selects the VOLTS/
DIV. (16) control knob function between attenuator and
vernier (variable). The current setting is displayed by the
VAR-LED located above the knob.
After switching the VAR-LED (16) on, the deflection
coefficient is still calibrated. Turning the VOLTS/DIV.
(16) control knob counter clockwise reduces the signal
height and the deflection coefficient becomes
uncalibrated.
The readout then displays e.g. “Y1>...”indicating the
uncalibrated condition instead of “Y1:...”. Pressing and
holding the CHI pushbutton again switches the LED off,
sets the deflection coefficient into calibrated condition
and activates the attenuator function. The previous ver-
nier setting will not be stored.
The CHI pushbutton can also be pressed simultaneously
with the DUAL(18) button. Please note item (18).
(18)DUAL - XY - Pushbutton with multiple functions.
DUAL mode:
Briefly pressing this button switches over to DUAL mode.

15
Subject to change without notice
Controls and Readout
Both deflection coefficients are then displayed. The pre-
vious trigger setting stays as it was, but can be changed.
All controls related to both channels are active, if the
inputs (27) and (31) are not set to GD (29) (33).
Whether alternated or chopped channel switching is
present depends on the actual timebase setting, and is
displayed in the readout.
ALT
displayed in the readout, indicates alternate channel
switching. After each timebase sweep the instrument
internally switches over from channel I to channel II and
vice versa. This channel switching mode is automatically
selected if any time coefficient from 200µs/div to 50ns/
div is active.
CHP
indicates chopper mode, whereby the channel switching
occurs constantly between channel I and II during each
sweep. This channel switching mode occurs when any
timebase setting between 500ms/div and 500µs/div has
been chosen.
The actual channel switching can be changed to the
opposite mode by briefly pressing both CHI (17) and
DUAL (18) simultaneously. If afterwards the time coef-
ficient is changed, the channel switching is automatically
set to the time coefficient related mode.
ADD mode:
Addition mode can be selected by briefly pressing the
DUAL (18) and CHII (21) buttons simultaneously. Whether
the algebraic sum (addition) or the difference (subtrac-
tion) of both input signals is displayed, depends on the
phase relationship and the INV (29) (33) setting(s). As a
result both signals are displayed as one signal. For correct
measurements the deflection coefficients for both chan-
nels must be equal.
Please note “Operating modes of the vertical amplifiers
in Yt mode”.
The readout indicates this mode by a “+”sign located
between both channel deflection coefficients. While the
trigger mode is not affected, the trigger point symbol is
switched off. The Y-position of the signal can be influ-
enced by both Y-POS controls (9) and (10).
XY mode:
This mode can be switched on or off by pressing and
holding the DUAL button (18).
In XY mode the deflection coefficients are displayed as
“Y...”for channel I and “X...”for channel II, followed by
“XY”. Except the cursor lines which may be active, all
other readout information including the trigger point
symbol are switched off. In addition to all trigger and
timebase related controls, the Y-POS. II (10) knob and
INV (33) button are deactivated. For X position alteration,
the X-POS. (14) knob can be used.
(19)TRIG.
Pushbutton with double function for trigger source selec-
tion and associated LEDs.
The button and the LEDs are deactivated if line (mains)
triggering is selected or XY operation is chosen.
With the aid of this button, the trigger source can be
chosen. There are three trigger sources available:
channel I, channel II (both designated as internal trigger
sources) and the TRIG. EXT. (34) input for external
triggering.
The availability of the internal sources depends on the
actual channel mode. The actual setting is indicated by
the associated LED(s).
Briefly pressing the button switches over in the following
sequence:
I - II - EXT - I in DUAL and ADD (addition) mode,
I - EXT - I if mono channel I is present,
II - EXT - II under mono channel II conditions.
Each condition is indicated by the associated LED and
displayed by the readout (“TR:Y1...”, “TR:Y2...”and
“TR:EXT...”). The trigger point symbol is switched off in
external trigger condition.
ALT:
Pressing and holding the button selects alternate trigger-
ing in DUAL mode. Under these conditions both I and II
LEDs are lit and the readout displays “TR:ALT...”. As
alternate triggering requires alternate channel operation,
alternate channel switching is set automatically. A change
of the time coefficient then has no affect regarding the
channel switching mode. In addition to the deflection
coefficients display, “ALT”is displayed by the readout
instead of “CHP”.
In alternate trigger mode the trigger point symbol is
switched off.
Alternate triggering is not available or automatically
switched off under the following conditions:
ADD (addition) mode,
alternate (A & B) timebase mode,
B timebase mode,
TVL, TVF and line (mains) trigger coupling.
(20) VOLTS/DIV. -
This control knob for channel II has a double function.
The following description relates to the input attenuator
function (VAR LED dark).
Turning the control knob clockwise increases the sensi-
tivity in a 1-2-5 sequence and decreases it if turned in the
opposite direction (ccw.). The available range is from

Subject to change without notice
16
Controls and Readout
1mV/div up to 20V/div. The knob is automatically switched
inactive if the channel related to it is switched off, or if the
input coupling is set to GD (ground).
The deflection coefficients and additional information
regarding the active channels are displayed in the readout,
e.g. “Y2: deflection coefficient, input coupling”. The “:”
symbolizes calibrated measuring conditions and is re-
placed by the “>”symbol in uncalibrated conditions.
(21)CH II - VAR. - Pushbutton with several functions.
CH II mode:
Briefly pressing the button sets the instrument to channel
II (Mono CH II) mode. The deflection coefficient displayed
in the readout indicates the current conditions (“Y2...). If
neither external nor line (mains) triggering was active, the
internal trigger source automatically switches over to
channel II (“TR:Y2...). The last function setting of the
VOLTS/DIV (20) knob remains unchanged.
All channel related controls are active if the input (31) is
not set to GD (33).
VAR.:
Pressing and holding this pushbutton selects the VOLTS/
DIV. (20) control knob function between attenuator and
vernier (variable). The current setting is displayed by the
VAR-LED located above the knob.
After switching the VAR-LED (20) on, the deflection
coefficient is still calibrated. Turning the VOLTS/DIV.
(20) control knob counter clockwise reduces the signal
height and the deflection coefficient becomes
uncalibrated.
The readout then displays “Y2>...”indicating the
uncalibrated condition instead of “Y2:...”. Pressing and
holding the CHII pushbutton again switches the LED off,
sets the deflection coefficient into calibrated condition
and activates the attenuator function. The previous ver-
nier setting will not be stored.
The CHII pushbutton can also be pressed simultaneously
with the DUAL (18) button. Please note item (18).
(22)TRIG. MODE - Pushbuttons and indicator LEDs.
Pressing the upper or lower button selects the trigger
coupling. The actual setting is indicated by a LED and by
the readout (“TR: source, slope, AC”).
Each time the lower TRIG. MODE pushbutton is pressed
the trigger coupling changes in the sequence:
AC (DC content suppressed),
DC (peak value detection inactive),
HF (high-pass filter cuts off frequencies below
approx. 50kHz), trigger point symbol switched off
NR (high frequency noise rejected),
LF (low-pass filter cuts off frequencies above
approx. 1.5kHz),
TVL (TV signal, line pulse triggering)
trigger point symbol switched off,
TVF (TV signal, frame pulse triggering)
trigger point symbol switched off.
~(line/mains triggering) trigger point symbol
and TRIG. LED (19) are switched off.
Please note:
In delay trigger mode (B timebase) the instrument is
automatically set to normal triggering mode and DC
trigger coupling. Neither setting is indicated by the
NM- (11) or the “DC”TRIG. MODE-LED. The previous
trigger settings regarding the A timebase remain un-
changed and are indicated by the LEDs (11) and (22).
In some trigger modes such as alternate triggering, some
trigger coupling modes are automatically disabled and
can not be selected.
(23)DEL.POS. - HO
Control knob with a double function and associated LED.
This control knob has two different functions depending
on the timebase mode.
A timebase:
In A timebase mode, the control knob applies to the hold
off time setting. If the HO-LED associated with the knob
is dark, the hold off time is set to minimum.
Turning the control knob clockwise switches the LED on
and extends the hold off time until the maximum is
reached (please note “Hold Off-time adjustment”).
The hold off time is automatically set to minimum (LED
dark), if the A timebase setting is changed. The (A) hold
off time setting is stored and active if alternate (A and B)
or B timebase mode is selected.
Alternate (A and B) and B timebase:
In alternate (A and B) and B timebase modes, the knob
controls the delay time setting.
Under alternate timebase mode conditions, the delay
time is visible on the A trace, beginning at the trace start
and ending at the start of the intensified sector. In the free
run condition (delay trigger not active) of the timebase, an
approximate delay time value is displayed in the readout
(“∆∆
∆∆
∆t:...”). This is an aid to find the position of the
intensified sector which may be very small.
If only the B timebase is being operated, the delay time
can also be varied, but there is no intensified sector as the
A trace is not visible.
(24)TIME/DIV. - The control knob has a double function.
The following description applies to the timebase switch
function (VAR LED dark).
Timebase Switch:
Turning the control knob clockwise reduces the deflec-
tion coefficient in a 1-2-5 sequence and increases it if
turned in the opposite direction (ccw.). The time coef-
ficient(s) is (are) displayed in the readout.

17
Subject to change without notice
Controls and Readout
In A timebase mode, time deflection coefficients be-
tween 500ms/div and 50ns/div can be chosen in 1-2-5
sequence, if the X-MAG. x10 function is not activated.
During alternate (A and B) and B timebase operation, the
control knob changes the B timebase setting in 1-2-5
sequence. The available deflection coefficient range is
from 20ms/div up to 50ns/div (without X-MAG. x10) but
the availability depends on the A timebase setting. The
internal control of the oscilloscope prevents the B time
deflection coefficient from becoming higher than the A
deflection coefficient, as such an operation condition
would make no sense.
If the A timebase setting is 200µs/div the B timebase
range from 20ms/div up to 500µs/div is not available and
the maximum time deflection coefficient for B would be
200µs/div. In the last named condition the change of the
A timebase from 200µs/div to 100µs/div switches the B
timebase also to 100µs/div. However the B timebase
setting remains unchanged if the A timebase is set to
500µs/div.
As already mentioned under DUAL (18) the channel
switching depends on the time deflection coefficient
setting. In the timebase ranges from 500ms/div to 500µs/
div chopped (CHP) channel switching is automatically
selected, through which the switching occurs constantly
during the timebase sweeps. Alternate (ALT) channel
switching is automatically used in all other time deflection
coefficient settings (200µs/div - 50ns/div). In the latter
case the active channel is switched off and the previously
inactive channel is switched on after the completion of
each timebase sweep. To avoid interference in chopped
mode, or to make both channels appear simultaneously
visible, the actual setting (ALT or CHP) displayed in the
readout can be overwritten and changed to the opposite
mode. This is carried out by simultaneously pressing and
holding the CHI (17) and the DUAL (18) pushbuttons.
(25)A/ALT - B - Pushbutton for timebase mode selection.
The instrument contains two timebases designated A
and B. With the aid of the B timebase, signal parts
displayed by the A timebase can be expanded in X-
direction. The expansion ratio depends on the time de-
flection coefficient ratio of both timebases (e.g. “A:
100µs”, “B:1µs”= 100). With higher expansion ratios the
B timebase trace intensity reduces.
Each time the A/ALT pushbutton is briefly pressed, the
timebase mode changes in the sequence A - alternate A
and B - A. The actual setting is displayed in the readout.
A:
In A timebase mode the TIME/DIV. (24) control knob is
operative only for this timebase. The readout then only
displays the A time coefficient. The timebase settings for
this condition are stored if the timebase mode is changed.
ALT:
If alternate (A and B = ALT) timebase mode is selected,
the TIME/DIV (24) knob only controls the B timebase
switch or vernier function. The alternate timebase mode
is a subfunction of the B timebase mode where both
timebase traces are displayed. Consequently the readout
displays both time deflection coefficients (e.g. “A:100µs
B:1µs”). Unlike the former A timebase mode, an intensi-
fied sector is also visible on the A trace. This sector
indicates the signal part which is displayed by the B
timebase.
The intensified segment can be shifted horizontally by the
DEL. POS. (23) control knob continuously (if the B
timebase is operated in free run conditions). The differ-
ence between the start of the A timebase trace and the
beginning of the intensified sector shows the delay time.
This information is also displayed in the readout as an
approximative value (e.g. “∆t:2.5ms”) related on the
calibrated A time coefficient (uncalibrated e.g.
“∆t>2.5ms”). The width of the segment decreases when
the B time coefficient is set to a lower value (higher time
deflection speed).
For better reading, the vertical position of the B trace
position can be shifted (please note “TRS”(8)).
Alternate timebase mode causes the display to alter
between A and B timebase after each sweep. In alternate
DUAL mode the sequence is channel I with A timebase,
channel I with B timebase, channel II with A timebase and
channel II with B timebase.
B:
Pressing and holding this button switches over from A or
alternate timebase mode to B timebase mode. If B
timebase mode is selected, pressing and holding selects
alternate timebase mode. Briefly pressing this button
switches over from B timebase mode to A timebase
mode.
In B timebase mode the display of the A trace(s), the
intensified sector(s) and the A time coefficient display in
the readout are disabled. As the trace separation (TR) is
no longer required under this circumstances, this func-
tion is switched off too. Consequently only the B time
coefficient is displayed by the readout.
If after switching on the B timebase (alternate or only B)
whether free run or triggered B operation is present
depends on the previous setting.
(26) DEL.TRIG. - VAR. - Pushbutton with two functions.
DEL. TRIG.:
Each time the pushbutton is briefly pressed, the instru-
ment switches between free run (untriggered) and trig-
gered B timebase, if alternate (A and B) or B timebase
mode is present.
The actual setting is displayed in the readout. Instead of
the approximate delay time (“∆∆
∆∆
∆t:...”) in free run mode,
the readout displays “∆∆
∆∆
∆Tr: slope, DC (trigger coupling)”

Subject to change without notice
18
Controls and Readout
in triggered delay mode. In this mode, the former A
timebase trigger settings regarding the trigger mode
(automatic or normal), -coupling, -slope and -level set-
tings are stored but still active. With the activated delay
trigger the instrument is automatically set to normal
trigger mode and DC trigger coupling for the B timebase.
As the instrument contains a separate trigger unit for the
B timebase, the trigger level and slope can be set
independently using the same controls used for the A
timebase trigger setting. The trigger point is indicated
again but has the added letter B in the readout.
In delay trigger mode, the delay time must first elapse.
Then the next suitable signal slope (direction and height)
starts the B timebase. If those basic requirements are not
met, there will be no B trace visible. Under the condition
that the signal contains several suitable slopes after the
delay time, it can be seen in alternate timebase mode that
the delay time setting (DEL. POS.) now causes the
intensified sector to jump from one slope to the other.
VAR.:
Pressing and holding the DEL.TRIG. - VAR. pushbutton
selects the TIME/DIV. (24) control knob function be-
tween timebase switch and vernier (variable). The cur-
rent setting is displayed by the VAR-LED located above
the knob.
The variable function can be activated for the A timebase
or the B timebase, the settings are stored separately. As
alternate timebase mode is a B timebase sub mode, only
the B timebase is affected in this condition.
A Timebase.
After switching the VAR-LED on, the time deflection
coefficient is still calibrated until further adjustments are
made. Turning the TIME/DIV. (24) control knob counter
clockwise increases the time deflection coefficient (re-
duces the deflection speed) and the deflection coefficient
becomes uncalibrated. Instead of e.g. “A:10µs”, the
readout then displays “A>10µs”indicating the uncalibrated
condition. This setting is stored if the instrument is
switched to alternate (A and B) or B timebase mode.
Pressing and holding the DEL.TRIG. - VAR. pushbutton
again in A timebase mode switches the LED off, the
timebase switch function on, and sets the time deflection
coefficient back into the calibrated condition.
B and Alternate Timebase.
In alternate (A and B) as well as in B timebase mode,
pressing and holding the DEL.TRIG. - VAR. pushbutton
selects the TIME/DIV. knob function between B timebase
switch and B vernier (VAR -LED on). In the latter case the
TIME/DIV. knob can be used in the same way as de-
scribed before under A timebase condition.
Underneath the front panel sector described above,
the BNC sockets and four pushbuttons are located.
(27)INPUT CH I - BNC socket.
This BNC socket is the signal input for channel I. In XY
mode, signals at this input are used for the Y deflection.
The outer (ground) connection is galvanically connected
to the instrument ground and consequently to the safety
earth contact of the line/mains plug.
(28)AC / DC - Pushbutton with two functions.
Input coupling:
Briefly pressing this pushbutton switches over from AC
(~ symbol) to DC (= symbol) input coupling and vice versa.
The setting is displayed in the readout with the deflection
coefficient.
Probe factor:
Pressing and holding the pushbutton selects the indi-
cated deflection coefficient of channel I displayed in the
readout, between 1:1 and 10:1. In condition 10:1 the
probe factor is thus indicated by a probe symbol displayed
by the readout in front the channel information (e.g.
“probe symbol”, Y1...). In the case of cursor voltage
measurement, the probe factor is automatically included.
Please note:
The symbol must not be activated unless a x10 (10:1)
attenuator probe is used.
(29)GD - INV. - Pushbutton with two functions.
GD:
Each time this pushbutton is pressed briefly, the input is
switched from active to inactive and vice versa. It is
displayed in the readout as an earth (ground) symbol
instead of the deflection coefficient and the ~ (AC) or =
(DC) symbol.
The GD setting disables the input signal, the AC/DC (28)
pushbutton and the VOLTS/DIV (16) knob. In automatic
trigger mode the undeflected trace is visible representing
the 0 Volt trace position.
The ”0 Volt”position is indicated by a ”⊥”symbol in the
readout. Please note Y-POS. I (9).
INV.:
Pressing and holding this pushbutton switches the chan-
nel I invert function on or off. The invert “on”condition
is indicated by the readout with a horizontal bar above
“Y1”(Yt mode) or “Y”(XY mode). The invert function
causes the signal display of channel I to be inverted by
180°.
(30)Ground socket - 4mm banana socket
galvanically connected to safety earth.
This socket can be used as reference potential connec-
tion for DC and low frequency signal measurement
purposes and in COMPONENT TEST mode.
(31)INPUT CH II - BNC socket.
This BNC socket is the signal input for channel II. In XY
mode, signals at this input are used for the X deflection.
The outer (ground) connection is galvanically connected
to the instrument ground and consequently to the safety
earth contact of the line/mains plug.
(32)AC / DC - Pushbutton with two functions.

19
Subject to change without notice
Controls and Readout
Input coupling:
Briefly pressing this pushbutton switches over from AC
(~ symbol) to DC (= symbol) input coupling and vice versa.
The setting is displayed in the readout with the deflection
coefficient.
Probe factor:
Pressing and holding the pushbutton selects the indi-
cated deflection coefficient of channel II displayed in the
readout, between 1:1 and 10:1. In condition 10:1 the
probe factor is thus indicated by a probe symbol displayed
by the readout in front the channel information (e.g.
“probe symbol”, Y2...). In the case of cursor voltage
measurement, the probe factor is automatically included.
Please note:
The symbol must not be activated unless a x10 (10:1)
attenuator probe is used.
(33)GD - INV. - Pushbutton with two functions.
GD:
Each time this pushbutton is pressed briefly, the input is
switched from active to inactive and vice versa. It is
displayed in the readout as an earth (ground) symbol
instead of the deflection coefficient and the ~ (AC) or =
(DC) symbol.
The GD setting disables the input signal, the AC/DC (32)
pushbutton and the VOLTS/DIV (20) knob. In automatic
trigger mode the undeflected trace is visible representing
the 0 Volt trace position.
The ”0 Volt”position is indicated by a ”⊥”symbol in the
readout. Please note Y-POS. II (10).
INV.:
Pressing and holding this pushbutton switches the chan-
nel II invert function on or off. The invert “on”condition
is indicated by the readout with a horizontal bar above
“Y2”(Yt mode). The invert function causes the signal
display of channel II to be inverted by 180°.
In XY mode the invert function of channel II is auto-
matically switched off.
(34)TRIG. EXT.
This BNC socket is the external trigger signal input. Briefly
pressing the TRIG. (19) pushbutton, until the information
“TR:EXT, slope, coupling”is visible in the readout and
the TRIG. “EXT”-LED is lit, switches the input active. The
outer (ground) connection is galvanically connected to the
instrument ground and consequently to the safety earth
contact of the line/mains plug.
Below the CRT there are the controls for the readout,
the component tester and the squarewave calibrator
with their outputs.
Please note:
The following description of the cursor related con-
trols assumes that the readout is visible and the
component tester is switched off.
(35) MENU - Pushbutton
Pressing and holding the pushbutton activates the display
of the MAIN MENU. It contains the submenus SETUP
and CALIBRATE.
Once a menu is displayed, the following pushbuttons are
of importance:
1. SAVE and RECALL (7) pushbutton.
Briefly pressing selects the submenu or an item within
the submenu.
2. SAVE (7) pushbutton SET function.
Pressing and holding the SAVE (7) pushbutton calls (sets)
the menu or the previously selected item. In those cases
where the item is marked ON/Off the setting changes
from ON to OFF or vive versa.
If "PRESS SECURITY KEY" is displayed, this function is
available only for HAMEG authorized workshops. Press
AUTOSET (3) to switch back to the menu.
3. AUTOSET (3) pushbutton.
Each time the AUTOSET pushbutton is pressed the
menu switches back one step until MAIN MENU is
displayed. Then pressing the AUTOSET pushbutton again
switches the menu operation off and AUTOSET is set to
the normal function.
(36)ON/OFF - CHI/II - 1/∆∆
∆∆
∆t
This pushbutton has several functions.
ON/OFF:
Pressing and holding the pushbutton switches both cur-
sor lines on or off. As the cursor lines are part of the
readout, they are visible only if the readout is switched on.
CHI/II:
This function
is required and available only in DUAL
and XY
mode
in combination with ∆∆
∆∆
∆V (38)
measurement. Briefly pressing the button switches
between channel I and channel II and vice versa.
In DUAL mode the measured result is displayed by the
readout with
“∆∆
∆∆
∆V1: ...”
or
“∆∆
∆∆
∆V2: ...”providing the
deflection coefficient is calibrated. The settings of the
cursors must relate to the signal of the selected channel.
In XY mode the instrument is automatically set to ∆∆
∆∆
∆V
measurement. In this mode two signals are normally
applied causing an X and a Y deflection. The deflection
coefficient selected for each channel may be different,
thus as in
DUAL
mode the ∆∆
∆∆
∆Vcursor measurement
requires a channel selection. Under channel I (Y signal)
measuring condition the cursor lines are displayed as
horizontal lines and the readout displays “∆∆
∆∆
∆VY: ...”
(calibrated). Briefly pressing the pushbutton changes to
channel II (X signal) voltage measurement. Then the cursor
lines are displayed as vertical lines and the readout
indicates
“∆∆
∆∆
∆VX> ...”
(uncalibrated).
In CH I or CH II mono mode, only one deflection coeffi-
cient is present and there is no requirement to select

Subject to change without notice
20
Controls and Readout
between different deflection coefficients. Consequently
the pushbutton is inactivated in combination with ∆V
measurements.
1/∆∆
∆∆
∆t:
If the ∆V function is not present, briefly pressing the
button selects between time and frequency measure-
ment which is not available in XY mode. The vertical
cursor lines and the measurement result apply to the
active timebase (A or B, resp. B in alternate timebase
mode).
In calibrated timebase condition the readout displays
“∆∆
∆∆
∆t:...”if time measurement is chosen. After switching
over to 1/∆t (frequency) “f:...”is displayed. If the timebase
is uncalibrated the readout displays “∆∆
∆∆
∆t>...”or “f<...”.
(37) TRK - CURSOR-Track function.
Briefly pressing simultaneously both buttons ON/OFF -
CHI/II - 1/∆∆
∆∆
∆t (36) and I/II - ∆∆
∆∆
∆V/∆∆
∆∆
∆t (38) switches over from
single cursor line operation to track mode and vice versa.
In TRK (track) mode both cursor lines are indicated as
active (both dotted lines uninterrupted).
(38) I/II - ∆∆
∆∆
∆V/∆∆
∆∆
∆t - Pushbutton with two functions.
I/II:
Briefly pressing this button changes the active (controlla-
ble) cursor in the sequence I - II - I, if TRK (track) mode is
not active. The active cursor is indicated by a continuously
dotted line. An interrupted dotted line indicates the
inactive cursor.
∆∆
∆∆
∆V/∆∆
∆∆
∆t:
Pressing and holding this pushbutton changes from volt-
age to time (or frequency) measurement and vice versa.
In XY mode the instrument is automatically set to ∆V.
∆∆
∆∆
∆V:
Please note!
In all
∆∆
∆∆
∆
V (voltage) measurement conditions, the divi-
sion ratio of the probe(s) must be taken into account.
The voltage value displayed in the readout must be
multiplied by 100 if e.g. a x100 (100:1) probe is used. In
case of x10 (10:1) probes, the probe factor can be
automatically included (see item (28) and (32)).
item 1: Timebase mode.
(CH I or CH II single channel mode, DUAL and ADD)
In the voltage measurement condition, the cursors are
displayed as horizontal lines and the result is displayed in
the readout.
Single channel mode (channel I or channel II).
The ∆V measuring result is automatically related to the
deflection coefficient of the active channel. The readout
displays “∆∆
∆∆
∆V1...”or “∆∆
∆∆
∆V2...”.
Dual mode.
The CURSOR lines must be set on the channel I or
channel II signal. As the deflection coefficients may be
different, it will be required to select between the deflec-
tion coefficients of channel I and II. Please note item (36)
CHI/II.
Addition (ADD) mode.
In ADD (addition) mode normally two input signals are
displayed as one signal (sum or difference). As the result
can only be determined if both (calibrated) deflection
coefficients are equal, the CHI/II (36) selection function
is deactivated. In that case the readout indicates “∆∆
∆∆
∆V...”
without any additional channel information. Different
deflection coefficient settings or uncalibrated deflection
coefficient(s) are indicated in the readout as “Y1<>Y2”.
item 2: XY mode.
In XY mode the instrument is automatically set to ∆∆
∆∆
∆V
measurement. The deflection coefficient selected for
each channel may be different, thus as in DUAL mode the
∆∆
∆∆
∆Vcursor measurement requires a channel selection.
Under channel I (Y signal) measuring condition the cursor
lines are displayed as horizontal lines and the readout
displays “∆∆
∆∆
∆VY...”. The cursor lines are displayed as
vertical lines and the readout indicates “∆∆
∆∆
∆VX...”if the
channel II deflection coefficient is chosen.
∆∆
∆∆
∆t:
In time or frequency measurement condition two vertical
cursor lines are displayed. The measurement result is
indicated as “∆∆
∆∆
∆t...”(time measurement) or “f...”(fre-
quency measurement). Please note item (36) 1/
∆∆
∆∆
∆
t.
NOTE:
For frequency measurement, the distance between
the cursors must equal exactly one signal period.
In XY mode the timebase is switched off. Conse-
quently time or frequency measurement is disabled.
(39)CURSOR - Center biased lever.
The active cursor line (in track mode: both lines) can be
shifted in the required direction, until the graticule limits
are reached. The directions are marked on the front panel
and depend on the selected measurement (∆U, ∆t or 1/
∆t). Which of two shift speeds is used, depends on how
far the CURSOR knob is pressed. With slight knob
pressure the cursor line(s) moves slowly. If the knob is
pressed to the full extent the cursor moves fast. If the
knob is released it automatically reverts to the center
position and the cursor shift stops.
(40)CAL. - Pushbutton and concentric socket.
A squarewave signal of 0.2Vpp ±1% is available from the
socket for probe adjustment purposes. The signal fre-
quency depends on the pushbutton setting. If the
pushbutton is released it is approx. 1kHz and can be
switched over (depressed) to approx. 1MHz. The pulse
duty factor may deviate from 1:1 and the frequency is not
calibrated.
(41)CT - Pushbutton and banana jack.
Pressing the pushbutton switches the instrument over
from oscilloscope to component test mode and vice
versa.
In component test mode, all controls are deactivated with
the exception of the CT button, AUTO SET (2) and
INTENS (4). All LEDs except “A”or “RO”(associated
with the INTENS knob) are dark. The readout displays only
“CT”in this condition.
One test lead is connected to the CT socket. The second
This manual suits for next models
3
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