Rohde & Schwarz Hameg HMO3522 User manual

350 MHz
Digital Oscilloscope
with FFT and mixed-signal (option)
HMO3522/3524
Manual
English

2Subject to change without notice
KONFORMITÄTSERKLÄRUNG
DECLARATION OF CONFORMITY
DECLARATION DE CONFORMITE
Hersteller HAMEG Instruments GmbH
Manufacturer Industriestraße 6
Fabricant D-63533 Mainhausen
Die HAMEG Instruments GmbH bescheinigt die Konformität für das Produkt
The HAMEG Instruments GmbH declares conformity of the product
HAMEG Instruments GmbH déclare la conformite du produit
Bezeichnung: Oszilloskop
Product name: Oscilloscope
Designation: Oscilloscope
Typ / Type / Type: HMO3524
mit / with / avec: HO720
Optionen / Options / Options: HO730, HO740
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
Angewendete harmonisierte Normen / Harmonized standards applied
Normes harmonisées utilisées:
Sicherheit / Safety / Sécurité:
EN 61010-1:2001 (IEC 61010-1:2001)
Messkategorie / Measuring category / Catégorie de mesure: I
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 / Imunitée: 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
01. 03. 2009
Unterschrift / Signature / Signatur
Holger Asmussen
Manager
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
emission 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 instrument 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 cable HZ72 from HAMEG is 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, 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 of 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 TFT, which is unavoidable. These effects can also be caused by direct
or indirect electrostatic discharge.
HAMEG Instruments GmbH
General information regarding the CE marking

3
Subject to change without notice
Contents
General information regarding the CE marking 2
350 MHz Digital Oscilloscope HMO3522 / HMO3524 4
Specifications 5
1 Installation and safety instructions 6
1.1. Setting up the instrument 6
1.2. Safety 6
1.3. Correct operation 6
1.4. Ambient conditions 6
1.5. Warranty and repair 6
1.6. Maintenance 7
1.7. CAT I 7
1.8. Mains voltage 7
2 Familiarize yourself with your new HAMEG
Digital Storage Oscilloscope 8
2.1. Front view 8
2.2. Control panel 8
2.3. Screen 9
2.4. Rear view 9
2.5. Options 9
2.6. General concept of instrument operation 9
2.7. Basic setting and integrated help 10
2.8. Firmware- and help updates 11
3 A quick introduction 12
3.1. Setting up and turning the instrument on 12
3.2. Connection of a probe and signal capture 12
3.3. Display of signal details 12
3.4. Cursor measurements 13
3.5. Automatic measurements 13
3.6. Mathematical functions 14
3.7. Storing data 14
4 Vertical system 15
4.1. Coupling 15
4.2. Sensitivity, Y-Positioning, and Offset 16
4.3. Bandwidth Limit and Signal Inversion 16
4.4. Probe attenuation selection 16
5 Horizontal System (Time Base) 17
5.1. Capturing modes RUN and STOP 17
5.2. Time base adjustments 17
5.3. Capture modes 17
5.4. ZOOM function 17
6 Trigger System 18
6.1. Trigger modes Auto, Normal, Single 18
6.2. Trigger sources 19
6.3. Slope trigger 19
6.4. Pulse trigger 19
6.5. Video trigger 20
7 Display of signals 20
7.1. Display settings 20
7.2. Use of the virtual screen area 20
7.3. Signal intensity and persistence functions 21
7.4. XY display 21
8 Measurements 22
8.1. Cursor measurements 22
8.2. Auto measurements 23
8.3. Quickview measurements 24
9 Analysis 24
9.1. Quick mathematics 24
9.2. Formula editor 25
9.3. Frequency analysis (FFT) 26
10 Documentation, storing and recalling 27
10.1. Instrument settings 27
10.2. References 28
10.3. Curves 28
10.4. Screen shots 29
10.5. Sets of formulas 29
10.6. Definition of the FILE/PRINT key 29
11 Mixed Signal Operation (optional) 30
11.1. Logic trigger 30
11.2. Display functions of the logic channels 30
11.3. Cursor measurements for the logic channels 31
12 Appendix 32

4Subject to change without notice
HMO3524
4GSa /s Real time, 50GSa/s Random sampling,
low noise flash A /D converter (reference class)
2MPts memory per channel, memory oom up to 100,000:1
MSO (Mixed Signal Opt. HO3508) with 8 /16 logic channels
Vertical sensitivity 1mV...5V/div. (into 1MΩ/50Ω)
Offset control ±0,2...±20V
12div. x-axis display range
Trigger modes: slope, video, pulsewidth, logic,
delayed, event
FFT for spectral analysis
6 digit counter, Autoset, automeasurement, formula editor
6.5” TFT VGA display, DVI output
3 x USB for mass storage, printer and remote ctrl.
optional IEEE-488 or Ethernet/USB
350MHz 2/4 Channel Digital Oscilloscope
HMO3522/HMO3524
HMO3524
NEW
The operating mode XYZ
Carrying Case HZ99
8 Channel
logic probe HO3508

5
Subject to change without notice
Technische Daten
350 MHz 2 [4] Channel Digital Oscilloscope
HMO3522 [HMO3524]
All data valid at 23 °C after 30 minute warm-up
Display
Display: 6,5” VGA Color TFT
Resolution: 640 x 480 Pixel
Backlight: LED 400cd/m2
Display area for curves:
without menu 400 x 600 Pixel (8 x 12 div.)
with menu 400 x 500 Pixel (8 x 10 div.)
Color depth: 256 colors
Intensity steps per channel: 0…31
Vertical System
Channels:
DSO mode CH1, CH2 [CH1...CH4]
MSO mode CH1, CH2 LCH 0...15 (logic channels)
with 2 x Option HO3508
Auxiliary input: Frontside [Rear side]
Function Ext. Trigger
Impedance 1MΩ || 13pF ± 2pF
Coupling DC, AC
Max. input voltage 100V (DC + peak AC)
XYZ-mode: All analog channels on individual choise
Invert: CH 1, CH 2 [CH1...CH4]
Y-bandwidth (-3dB):350MHz (5mV...5V)/div.
100MHz (1mV, 2mV)/div.
Lower AC bandwidth: 2Hz
Bandwidth limiter
(switchable): approx. 20MHz
Rise time (calculated):‹ 1ns
DC gain accuracy 2%
Input sensitivity: 12 calibrated steps
CH1, CH2 [CH1...CH4] 1mV/div.…5V/div. (1-2-5 Sequence)
Variable Between calibrated steps
Inputs CH1, CH2 [CH1…CH4]:
Impedance 1MΩ II 13pF ± 2pF (50Ω switchable)
Coupling DC, AC, GND
Max. input voltage 200V (DC + peak AC), 50Ω ‹5Vrms
Measuring circuits: Measuring Category I (CAT I)
Position range ± 10Divs
Offset control:
1mV, 2mV ±0,2V
5mV…50mV ±1V
100mV…5V ±20V
Logic channels With Option HO3508
Select. switching thresholds TTL, CMOS, ECL, 2 x User -2V…+8V
Impedance 100kΩ || ‹ 4pF
Coupling DC
Max. input voltage 40V (DC + peak AC)
Triggering
Analog channels:
Automatic: Linking of peakdetection and triggerlevel
Min. signal height 0.8div; 0.5div typ.
Frequency range 5Hz…400MHz
Level control range From peak- to peak+
Normal (without peak):
Min. signal height 0.8div; 0.5div typ.
Frequency range 0…400MHz
Level control range –10div....+10div.
Operating modes: Slope/Video/Logic/Pulse
Slope: Rising, falling, both
Sources: CH1, CH2, Line, Ext., LCH0…15
[CH1...CH4, Line, Ext., LCH0…15]
Coupling: AC: 5Hz...400MHz
DC: 0...400MHz
HF: 30kHz...400MHz
LF: 0...5kHz
Noise rejection: 100MHz LPF switchable
Video: Pos./neg. sync. impulse
Standards 525 Line/60Hz systems
625 Line/50Hz systems
Fields Field 1, field 2, both
Line All, selectable line number
Source CH1, CH2, Ext. [CH1...CH4]
Logic: AND, OR, TRUE, FALSE
Source LCH0…15
State LCH0…15 X, H, L
Indicator for trigger action: LED
Ext. Trigger via: Auxiliary input [Aux. input at rear side]
0,3V…10Vss
2nd Trigger:
Slope Rising, falling, both
Accessories supplied: Line cord, Operating manual, 2 [4] Probes, 10:1 with
attenuation ID (HZ350), Dual-Interface USB/RS-232 (HO720), CD
Optional accessories:
HO730 Dual-Interface Ethernet/USB
HO740 Interface IEEE-488 (GPIB) galvanically isolated
HZ46 4RU 19'' Rackmount Kit
HZ355 Slimline Probe 10:1 with automatically identification
HO3508 8 Channel Logic Probe
Min. signal height 0.8div; 0.5div typ.
Frequency range 0…400MHz
Level control range –10div....+10div.
Operating modes:
after time 20ns…0.1s
after incidence 1…216
Horizontal System
Domain representation: Time, Frequency (FFT), Voltage (XY)
Representation Time Base: Main-window, main- and zoom-window
Memory Zoom: Up to 100.000:1
Accuracy: 15ppm
Time Base:
Refresh operating modes 1ns/ div.…20ms/div.
Roll operating modes 50ms/div.…50s/div.
Digital Storage
Sampling rate (real time):2x2GSa/s, 1x4GSa/s
[4 x 2GSa/s, 2 x 4GSa /s]
Logic channels: 16 x 1GSa/s
Sampling rate (random):50GSa /s (n/a to logic channels)
Memory: 2 x2MPts [4 x 2MPts]
Operation modes: Refresh, Average, Envelope, Peak-Detect
Roll: free run/triggered, Smooth
Resolution (vertical) 8Bit
Resolution (horizontal)
Yt Mode (50 Pts./div.)
XY Mode 8Bit
Interpolation: Sinx/x (CH1...CH4), Pulse (LCH0...15)
Persistence: Off, 50ms...∞
Delay pretrigger: 0...2 Million x (1/samplerate)
posttrigger: 0...8 Million x (1/samplerate)
Display refresh rate: Up to 2500 waveforms/ s
Display: Dots, vectors (interpolation), ‘persistence’
Reference memories: typ. 10 Traces
Operation / Measuring / Interfaces
Operation: Menu-driven (multilingual), Autoset,
help functions (multilingual)
Save / Recall memories: typ. 10 complete instrument parameter
settings
Frequency counter:
0.5Hz...350MHz 6 Digit resolution
Accuracy 15ppm
Auto measurements: Frequency, Period, pulse count, UDC, Upp,
Up+, Up-, URMS, UAvg, tRise, tFall
Cursor measurements: ΔV, Δt, 1/Δt (f), V to Gnd, Vtrelated to Trigger
point, ratio X and Y, pulse count, peak to
peak, peak+, peak-
Interface: Dual-Schnittstelle USB/RS-232 (HO720)
USB-Stick (frontside)
USB-Printer (rear side) with SW V2.0
DVI for ext. monitor
Optional: IEEE-488, Ethernet/USB
Mathematic functions
Number of formula sets: typ. 10 formula sets with up to 5 formulas each
Sources: All channels and math. memories
Targets: Math. memories
Functions: ADD, SUB, 1/X, ABS, MUL, DIV, SQ,
POS, NEG, INV
Display: Up to 4 math. memories
General Information
Probe ADJ Output: 1kHz/1MHz square wave signal ~0.2Vpp
(ta ‹ 4ns)
Internal RTC (Realtime clock):Date and time for stored data
Line voltage: 105...253V, 50/60Hz, CAT II
Power consumption: Max. 70Watt at 230V, 50Hz
Protective system: Safety class I (EN61010-1)
Operating temperature: +5°C...+40°C
Storage temperature: -20°C...+70°C
Rel. humidity: 5%...80% (non condensing)
Dimensions (W x H x D):285x175x220mm
Weight: 3.6kg
Dual-Interface USB/RS-232 (HO720)

6Subject to change without notice
Installation and safety instructions
1 Installation and safety instructions
1.1. Setting up the instrument
As can be seen from the figures, the handle can be set into
different positions:
A and B = carrying
C = horizontal operating
D and E = operating at different angles
F = handle removal
G = operating using the feet‘s, batch use and for shipping in
original packaging
STOP
Attention!
When changing the handle position, the instrument
must be placed so that it cannot fall (e.g. placed on
a table). Then the handle locking knobs must be
simultaneously pulled outwards and rotated to the
required position. Without pulling the locking knobs
they will latch in into the next locking position.
Removal/fitting of the handle: The handle can be removed in
position F, pulling the side parts outside the housing. Adding
the handle works vice versa.
1.2. Safety
The instrument fulfils the VDE 0411 part 1 regulations for
electrical measuring, control and laboratory instruments and
was manufactured and tested accordingly. It left the factory in
perfect safe condition. Hence it also corresponds to European
Standard EN 61010-1 and International Standard IEC 1010-1.
In order to maintain this condition and to ensure safe opera-
tion the user is required to observe the warnings and other
directions for use in this manual. Housing, chassis as well as
all measuring terminals are connected to safety ground of the
mains. All accessible metal parts were tested against the mains
with 2200VDC. The instrument conforms to safety class I. The
oscilloscope may only be operated from mains outlets with a
safety ground connector. The mains plug has to be installed
prior to connecting any signals. It is prohibited to separate the
safety ground connection. If suspected that safe operation may
not be guaranteed do not use the instrument any more and lock
it away in a secure place.
Safe operation may be endangered if any of the following was
noticed:
– in case of visible damage.
– in case loose parts were noticed
– if it does not function any more.
– after prolonged storage under unfavourable conditions (e.g.
like in the open or in moist atmosphere).
– after any improper transport (e.g. insufficient packing not
conforming to the minimum standards of post, rail or trans-
port firm)
1.3. Correct operation
Please note: This instrument is only destined for use by person-
nel well instructed and familiar with the dangers of electrical
measurements. For safety reasons the oscilloscope may only
be operated from mains outlets with safety ground connector.
It is prohibited to separate the safety ground connection. The
plug must be inserted prior to connecting any signals.
The oscilloscope is destined for operation in industrial, business,
manufacturing, and domestic sites.
1.4. Ambient conditions
Operating ambient temperature: +5 °C to +40 °C. During trans-
port or storage the temperature may be –20 °C to +70°C. Please
note that after exposure to such temperatures or in case of
condensation, proper time must be allowed until the instrument
has reached the permissible temperature, and until the con-
densation has evaporated before it may be turned on! Ordinarily
this will be the case after 2 hours. The oscilloscope is destined
for use in clean and dry environments. Do not operate in dusty
or chemically aggressive atmosphere or if there is danger of
explosion. The any operating position may be used, however,
sufficient ventilation must be ensured. Prolonged operation
requires the horizontal or inclined position.
STOP
Do not obstruct the ventilation holes!
Specifications are valid after a 30 minute warm-up period at 23
degr. C (tolerance ±2 degr. C). Specifications without tolerances
are average values.
1.5. Warranty and repair
HAMEG instruments are subjected to a strict quality control.
Prior to leaving the factory, each instrument is burnt in for 10
hours. By intermittent operation during this period almost all
defects are detected. Following the burn in, each instrument is
tested for function and quality, the specifications are checked
Carrying positionsOperating positions
Removing the handle (Pos. F)
Stacking positions
E
D
C
A
B
A
B
C
D
E
F
G
Positions of the instrument
G

7
Subject to change without notice
Installation and safety instructions
in all operating modes; the test gear is calibrated to national
standards.
The warranty standards applicable are those of the country
in which the instrument was sold. Reclamations should be
directed to the dealer.
Only valid in EU countries
In order to speed claims, customers in EU countries may also
contact HAMEG directly. Also, after the warranty expired, the
HAMEG service will be at your disposal for any repairs.
Return material authorization (RMA):
Prior to returning an instrument to HAMEG, ask for a RMA
number either by internet (http://www.hameg.com) or fax (+49
(0) 6182 800 501). If you do not have an original shipping carton,
you may obtain one by calling the HAMEG service dept (+49 (0)
6182 800 500) or by sending an email to [email protected].
1.6. Maintenance
Clean the outer case using a dust brush at regular intervals.
Dirt can be removed from housing, handle, all metal and plastic
parts using a cloth moistened with water and 1 % detergent.
Greasy dirt may be removed with benzene (petroleum ether) or
alcohol. Thereafter wipe the surfaces with a dry cloth. Plastic
parts should be treated with a suitable antistatic solution. No
fluid may enter the instrument. Do not use other cleansing
agents as they may adversely affect the plastic or lacquered
surfaces.
1.7. CAT I
This oscilloscope is destined for measurements in circuits not
connected to the mains or only indirectly. Direct measurements,
i.e. with a galvanic connection to circuits corresponding to the
categories II, III, or IV are prohibited! The measuring circuits
are considered not connected to the mains if a suitable isolation
transformer fulfilling safety class II is used. Measurements
on the mains are also possible if suitable probes like current
probes are used which fulfill the safety class II. The measure-
ment category of such probes must be checked and observed.
The measurement categories were derived corresponding to
the distance from the power station and the transients hence to
be expected. Transients are short, very fast voltage or current
excursions which may be periodic or not.
Measurement CAT IV: Measurements close to the power station,
e.g. on electricity meters
Measurement CAT III: Measurements in the interior of buildings
(power distribution installations, mains outlets, motors which
are permanently installed).
Measurement CAT II: Measurements in circuits directly con-
nected to the mains (household appliances, power tools etc).
Measurement CAT I: Electronic instruments and circuits which
contain circuit breakers or fuses.
1.8. Mains voltage
The instrument has a wide range power supply from 105 to
253V, 50 or 60 Hz ±10%. There is hence no line voltage selector.
The line fuse is accessible on the rear panel and part of the line
input connector. Prior to exchanging a fuse, the line cord must
be pulled out. Exchange is only allowed if the fuse holder is
undamaged. It can be taken out using a screwdriver put into the
slot. The fuse can be pushed out of its holder and exchanged.
The holder with the new fuse can then be pushed back in place
against the spring. It is prohibited to ”repair“ blown fuses or to
bridge the fuse. Any damages incurred by such measures will
void the warranty.
Type of fuse:
Size 5 x 20 mm; 250V~, C; IEC 127, Bl. III; DIN 41 662 (or DIN 41
571, Bl. 3). Cut off: slow blow (T) 2A.
Fuse Mains input connector Interface
Type of fuse

8Subject to change without notice
Introduction
SCALE
VOLTS / DIV
Y-POSITION
CHANNEL CONTROL
FINE
6
2
-
K
3
0
4
-
1
1
5
0
-
1
.
0
MENU
CH1
CH2
CH3
POD1
MATH
REF
X Y
CH4
POD2
18
B
19
20
22
23
24
21
25
26
27
CURSOR/MENU ANALYZE GENERAL
CURSOR
SELECT
CURSOR
MODE
AUTO
MEASURE
SCROLL
BAR
CURSOR
MEASURE
FFT
QUICK
VIEW
DISPLAY
AUTO
SET
SETUP HELP
SAVE
RECALL
INTENS
PERSIST
FILE
PRINT
3
A
5
15 16
811 14
910
6712 13 4
17
HMO 3524
350 MHz / 4 GSa / 2MB DIGITAL OSCILLOSCOPE
SCALE
VOLTS / DIV
SCALE
TIME / DIV
LEVELY-POSITION X-POSITION
CHANNEL CONTROL HORIZONTALTRIGGER
CURSOR/MENU ANALYZE GENERAL
TRIG’d SLOPE
USB STICK LOGIC CHANNELS REM CH 1 CH 2 CH 3 CH 4
1MΩ II 13pF
max.
200 Vp
1MΩ II 13pF
max.
200 Vp
1 kHz / 1 MHz
ca. 0.2 Vpp
PROBE ADJUST
TB/ZFINE
POD 2 (15..8) POD 1 (7..0)
CAT I
!
Use recommended probes only!
!!
Made in
Germany
50Ω
≤5V RMS
M
E
M
O
R
Y
6
2
-
K
3
0
4
-
1
1
5
0
-
1
.
0
HMO 3524
350 MHz / 4 GSa / 2MB DIGITAL OSCILLOSCOPE
MENU
CURSOR
SELECT
CURSOR
MODE
AUTO
MEASURE
SCROLL
BAR
CURSOR
MEASURE
FFT
QUICK
VIEW
DISPLAY
AUTO
SET
CH1
CH2
CH3
POD1
MATH
REF
AUTO
NORM
X Y MENU
TYPE
SOURCE FILTER
SLOPE
ACQUIRE
SINGLE RUN
STOP
SET
CLR
SETUP HELP
SAVE
RECALL
INTENS
PERSIST
CH4
POD2
FILE
PRINT
49
1
48 47 46 4550515253
2
54 A
B C D
2 Familiarize yourself with your new HAMEG
Digital Storage Oscilloscope
2.1. Front view
The following controls and inputs/outputs are located on the
front: Power switch
1
, the control panel
2
,
A
,
B
,
C
,
D
, the BNC
connectors of the analog inputs
45
to
48
, the probe adjustment
output
50
, the connectors for the optional logic probes HO3508
51 52
, a USB port for USB sticks
53
, the TFT screen
54
and the
LED
49
for showing activity on the remote interface.
STOP
Please note, the connectors for the active logic
probes HO3508
51 52
are solely for theses probes.
Connecting anything else could destroy the inputs!
2.2. Control panel
The controls on the front panel allow direct access to the most
important functions; all extended functions are available via the
menu structure by using the grey soft keys. The power switch
1
is clearly set apart by its red colour. The most important
controls are backlighted by coloured LEDs in order to imme-
diately indicate the actual settings. The panel is subdivided in
these four areas:
Area
A
Fig. 2.1: Frontview of the HMO3524
This area encompasses these three portions: CURSOR/MENU
– ANALYZE – GENERAL.
In the portion CURSOR/MENU you find the cursor functions
6 8
, the general cursor select and adjustment knob
4
, the
Intensity/Persistence key
7
, and the key for the selection of
virtual screen.
The portion ANALYZE allows direct selection of FFT
9
displays,
the Quick-view mode
10
(all important parameters of the ac-
tual signal display), and the „Automeasure“ function
11
for the
automatic measurement of parameters.
The portion headed GENERAL comprises the following keys:
SAVE/RECALL
12
for saving and recalling instrument settings,
reference signals, signals, screen displays, and sets of for-
mulae, HELP
16
, DISPLAY
14
for access to the general display
settings, AUTOSET
15
, SETUP
13
for access to the general
settings (e.g. the language), FILE/PRINT
17
.
Area
B
:
In the portion CHANNEL CONTROL
you find all controls of the analog
channels such as the position con-
trol knob
18
, the XY mode select
key
19
, the vertical gain adjustment
knob
20
, the extended menu func-
tions key
21
, the channel select keys
22
to
25
, (the two-channel version
HMO3522 has only
22 23
) which
also serve as the selection keys for
Fig. 2.3: Area B of the
control panel.
Fig. 2.2:
Area A of the
control panel.

9
Subject to change without notice
Introduction
LEVEL
TRIGGER
TRIG’d SLOPE
AUTO
NORM
TYPE
SOURCE FILTER
SLOPE
SINGLE
28
C
29
30
33
31
34
35
36
32
SCALE
TIME / DIV
X-POSITION
HORIZONTAL
TB/Z
M
E
M
O
R
Y
MENU
ACQUIRE
RUN
STOP
SET
CLR
37
D
38
37
41
39
42
43
44
40
the optional logic probes
24 25
. There are also the mathematics
function key
26
and the reference signal settings key
27
.
Area
C
:
This area TRIGGER of the control
panel offers all functions for the
adjustment of the trigger level
28
, the selection of auto or normal
trigger
29
, the trigger type
31
, the
trigger source
32
, single sweep
33
, the trigger slope
34
, the trigger
signal filters
36
. In addition, the-
re are status indicators showing
whether a signal fulfills the trigger
conditions
30
and which slope was
selected
34
.
Area
D
:
The keys
37 38 39
on this control
panel area HORIZONTAL allow to
shift the trigger position horizontal-
ly, either step-by-step or using the
smaller one of the knobs. The back-
lighted key
39
controls the run or
stop modes; the key will light up red
in stop mode. The key
40
activates
the zoom function, the key
44
the
selection of the acquisition modes,
the key
42
the access to the time
base menus. The knob
43
allows to
adjust the time base speed.
To the left of the control panel there
are the soft keys
2
which control the
menu functions.
2.3. Screen
The HMO is equipped with a 6.5“
(16.5 cm) LED backlighted colour
TFT display with VGA resolution (640
x 480 pixels). In normal mode (no menus shown) there are 12
divisions in X direction. If menus are shown, this will be redu-
ced to 10 divisions. On the left of the screen area little arrows
[1] indicate the reference potentials of the channels. The line
above the graticule contains status and settings information
such as the time base speed, the trigger delay and other trigger
conditions, the actual sampling rate, and the acquisition mode
[2]. On the right of the graticule a short menu is shown which
Fig. 2.4: Area C of the
control panel
Fig. 2.5: Area D
of the control panel
contains the most important settings of the channel actually
being displayed; these may be selected using the soft keys [3].
Below the graticule, measurement results of parameters and
cursors, the settings of the activated vertical channels, of the
reference signal, and of the mathematically derived curves [4]
are shown. Within the graticule, the signals of the selected chan-
nels are displayed. Normally, 8 vertical divisions are shown; it
can be virtually extended to 20 divisions which can be displayed
using the SCROLL BAR knob
5
.
2.4. Rear view
On the rear panel there are the mains connector [1], the re-
ceptacle for the interface modules [2] (USB / RS-232, Ethernet,
IEEE-488), the standard DVI connector [3] for the connection
of external monitors and projectors, the BNC connector for
the Y output [4] (of the channel selected for triggering) and the
external trigger input [5]. With the two-channel models this
connector is located on the front panel.
Fig. 2.7: Rear panel of the HMO3524
2.5. Options
The HMO352x series instruments offer some options which
allow you to extend the areas of application considerably. The
following interface modules are available and may be installed
by the customer in the rear receptacle:
– HO740 (IEEE-4888, GPIB, galvanically isolated)
– HO730 (combination of Ethernet and USB with integrated
web server)
All HMO 352x series instruments are prepared for mixed-
signal operation and have the appropriate connectors on the
front panel. Each of these connectors can be connected to an
8-channel logic probe HO3508, hence a maximum of 16 logic
channels is possible. More available options are the passive
500MHz slimline10:1 probes HZ355, the 19inch rack kit HZ46
and the carrying bag HZ99.
2.6. General concept of instrument operation
HAMEG oscilloscopes are renowned for easy operation, based
on a few basic principles which repeat with the diverse settings
and functions.
– Such keys which do not open a soft menu (e.g. Quickview)
switch a function on, pushing the key again will switch the
function off.
– Such keys which call a specific function (e.g. FFT) which
in turn can call or require more settings will activate the
function upon the first touch. Pushing the key a second time
will call the soft menu (sub menu) for the settings. Pushing
the key a third time will deactivate the function.
[1] [2] [2]
[5] [4] [3]
Fig. 2.6: Screen

10 Subject to change without notice
– Such keys which open a soft menu upon the first touch will
close it upon pushing a second time.
– The universal knob is used in the diverse menus either for
selecting numbers or submenus.
– The key MENU OFF below the soft menu keys closes the
present menu or it switches to the next higher level.
– If a channel is deactivated, pushing the respective channel
key will switch it on. If a channel was already activated
earlier, selecting another channel will change operation
to the channel whose key was pushed (its LED lights up). If
a channel is already selected, pushing its lighted key will
deactivate the channel and select the next channel according
to this sequence: CH1 >CH2 >CH3 >CH4.
– If cursor measurements are activated, the „CURSOR SE-
LECT“ key will select the cursor which can be moved with
the universal knob. In all menus for alpha-numeric inputs
and at the filemanager the knob is used to select or confirm
entries.
The following describes some frequently used navigation ele-
ments in the soft menus.
In the Fig. 2.8 there are two basic soft menu elements for choosing
something are shown. To select from the first three you just need
to press the soft key beside and the element is active (shown as
blue color). A second kind of selecting is shown on the lower two
menu entries. Pressing the respective soft key toggles between
the two choices, again the active selection is marked blue.
The menus are used as shown in Fig. 2.9 if they concern func-
tions which have either to be switched on or where values have
to set. The choice is between OFF and the value presented. The
round arrow in the right corner of the menu window points to
the universal knob which is to be used for selecting the value. If
there is a lower menu level, this will be indicated by a small tri-
angle in the right lower corner of the respective menu point.
If there are further pages on the same level, the lowest menu
point will be used for navigation. It shows the number of menu
pages on this level as well as the activated number of pages.
Pushing the respective soft menu key will advance by one page,
after the last page the first one will follow.
2.7. Basic setting and integrated help
Basic settings like language for user interface and help, mis-
cellaneous settings and interface settings can be set using
the menu which opens after pressing the SETUP key in the
GENERAL area of the control panel
Fig. 2.10: Menu for basic settings
On the first page you can set the user interface and help langu-
age by pressing the soft key LANGUAGE and select German or
English. (Complete support for French and Spanish for the help
function will be implemented latest in firmware 2.0.)
The soft key beside MISC opens a menu with the following
selections:
– MENU OFF (choose manual or automatic with time limit of
4s up to 30 s for closing soft menus)
– TIME REFERENCE (position for reference of the trigger time,
choose from -5/DIV up to +5/DIV, 0/DIV is in the middle of
the screen and set as standard)
– DATE & TIME (opens menu to set date and time)
– SOUND (opens menu to set any combination of beep for
control, error and/or trigger)
– DEVICE NAME (menu to set a name for the HMO352x, ma-
ximum of 19 characters are allowed, the name will appear
in Screenshot‘s)
– DEVICE INFOS (opens a window with detailed information
about hardware and software of your HMO352x)
The next menu entry INTERFACE lets you select the interface
you are using (USB and RS-232 are standard) and possible
settings for that interface.
The last menu entry PRINTER shows all settings for postscript
printer; beginning with firmware 2.0 there will be also support
for other compatible printer.
At the second page of the basic menu you find the menu for
firmware and help update, which is explained in detail in the
next chapter. The last menu item is the PROBE ADJUST.
Pressing the soft key leads you to the menu where you can set
whether the probe adjust output generates a rectangular signal
with 1kHz or 1MHz frequency. There is a setting AUTOMATIC
which means, that for timebase settings up to and including
50μs/DIV the probe adjust output is 1MHz, from 100 μs/DIV on
it is switched to 1kHz.
The integrated help function can be activated by pressing the
key HELP in the GENERAL area of the control panel. A window
will open and the text inside is dynamically updated depending
Fig. 2.8: Selection of basic soft
menu elements
Fig. 2.9: Basic soft menu
elements for settings and
navigation
Introduction

11
Subject to change without notice
on the key (including softmenu key’s) you are pushing or the
knob you are turning. If you do not need the help anymore, you
can switch off the help window by pushing the “HELP” key. The
backlight of the key and the text window will be switched off.
2.8. Firmware- and help updates
The HMO352x series is being improved continuously. You are
invited to download the most recent firmware under www.
hameg.com/hmo3524. Firmware and help are packed into one
ZIP data packet. After downloading the ZIP data unpack it into
an USB stick’s basic directory. Thereupon insert the stick into
the USB port of the oscilloscope and push the key SETUP in the
GENERAL area of the front panel. Choose page 2 in the menu,
if this has not been opened already. Here you shall find the
menu item UPDATE. After selecting this menu item a window
will open which displays the actual firmware version indicating
the version number, the date and build information.
Fig: 2.11: Updating menu and information window
Now choose which to update: the firmware or the help function.
If both are to be updated it is recommended to first update the
firmware. After you selected firmware updating by pushing
the appropriate key the respective date will be searched on
the stick, the information of the firmware to be updated from
the stick will be displayed below the line NEW. In case the new
firmware should be identical to the existing one, the number
of the version will be shown in red, otherwise it will be shown
in green; only then should you activate the updating by pushing
the soft key EXECUTE.
Fig. 2.12: Menu and information display of the help updating
If you intend to update the help function or add a help language
choose HELP in the updating menu.
The information window will now display the languages instal-
led, the date, and the information about the languages available
on the stick. With the soft menu, languages may be added,
removed or updated. Please note the format of the date:YYYY-
MM-DD according to the multi language norm of ISO 8601.
Introduction

12 Subject to change without notice
A quick introduction
3 A quick introduction
The following chapter is intended to introduce you to the most
important functions and settings of your new HAMEG HMO352x
oscilloscope in order to allow you to use the instrument im-
mediately. The internal calibrator signal output is used as the
signal source, so you will not need any additional instruments
for the first steps.
3.1. Setting up and turning the instrument on
Position the handle so the display will be inclined slightly up-
wards. (See chapter 1.2 for positioning of the handle.) Plug the
power cord into the rear panel connector. The instrument will
be turned on by pushing the red key On/Off
1
on the front panel.
After a few seconds the display appears, and the oscilloscope
is ready for measurements. Now press the key AUTOSET
15
for at least 3 seconds.
CURSOR/MENU ANALYZE GENERAL
CURSOR
SELECT
CURSOR
MODE
AUTO
MEASURE
SCROLL
BAR
CURSOR
MEASURE
FFT
QUICK
VIEW
DISPLAY
AUTO
SET
SETUP HELP
SAVE
RECALL
INTENS
PERSIST
FILE
PRINT
3
A
5
15 16
811 14
910
6712 13 4
17
Fig. 3.1: Control panel HMO352x
3.2. Connection of a probe and signal capture
Take one of the probes HZ350 delivered with the instrument,
the ground cable and the probe tip.
STOP
The passive probes should be calibrated before
first use. Please follow the instruction of the probe
manual. Please use the shortest ground connection
possible to the PROBE ADJUST output.
Connect the ground cable to the probe and the tip to the top of
the probe. Now connect the compensation box BNC connector
to the input connector of channel 1 and secure it by turning it
CW until it latches. Connect the ground cable to the left output
jack and hold the tip to the right jack of PROBE ADJUST. The
following display should be visible.
Fig. 3.2: Screen display after connection of the probe
On the right hand side of the screen you will see a short menu of
channel 1, the soft keys allow you to select frequently used settings.
Press the top soft key once to change the input coupling to DC.
STOP
The actual settings are marked by underlying blue
fields, repeated pressing of the keys will alternate
between the settings.
Fig. 3.3: Screen display after changing to DC coupling
Now press the AUTOSET key
15
once shortly, after a few seconds
the oscilloscope will have automatically selected appropriate
vertical, horizontal time base and trigger settings. You will see
now a square wave signal.
Fig. 3.4: Screen display after Autosetup
3.3. Display of signal de-
tails
With the knob
43
you can change
the displayed time window: turning
it CCW will slow the time base. The
memory depth of 2MB per channel
allows you to capture wide time win-
dows with high resolution. Continue
to turn the knob CCW until you read
„TB:5ms“ in the top left corner. Now
press the ZOOM key
40
.
Fig. 3.5: Area of the control panel
containing the ZOOM knob
SCALE
TIME / DIV
X-POSITION
HORIZONTAL
TB/Z
M
E
M
O
R
Y
MENU
ACQUIRE
RUN
STOP
SET
CLR
37
D
38
37
41
39
42
43
44
40

13
Subject to change without notice
A quick introduction
You see now a two-window display: the display will show in
the top area the complete captured signal, below an enlarged
portion. Use the time base knob to select the zoom factor and
the small knob for horizontal positioning.
Fig. 3.6: ZOOM function
By pressing the ZOOM key
40
again the zoom mode be will be
deactivated.
3.4. Cursor measurements
After displaying the signal and its details we now proceed to
measuring it using the cursor functions. Press again shortly
AUTOSET
15
and then the CURSOR/MEASURE key
8
. Now
the cursor menu will open up, and you can select the kind of
cursor. Press the top soft key in order to open the appropriate
menu. Use the knob in the CURSOR/MENU area for the selec-
tion by turning it CCW until the V-marker is underlined, press
the CURSOR SELECT key or wait for some seconds in order
to accept the selection. Now two cursors will be displayed
along with the signal, and the measurement results in the
right bottom area of the screen. Select the active cursor with
the SELECT key
3
and position it with the knob.
Fig. 3.7: Cursor measurements
The cursor measurement results will be displayed in the left
bottom corner of the screen. In this case the „V cursor“ has se-
lected the voltages at the two cursor positions, their difference,
and the time difference between the positions will be shown. The
cursors will be switched off by pressing the CURSOR/MEASURE
key and the associated CURSORS OFF soft key.
3.5. Automatic measurements
In addition to cursor measurements the most important signal
parameters can be displayed. Your HAMEG oscilloscope offers
these possibilities:
– the definition of the display of 2 parameters which may come
from different sources
– a quick view of all important parameters of one source using
the QUICK VIEW function.
Please change the time base now to 100 μs/div. and press the
QUICK VIEW key.
10
.
Fig. 3.8: Quick View parameter measurement
Here you see the most important parameters of a signal dis-
played:
– positive and negative – rise and fall times
peak voltages – mean voltage
In the right bottom corner of the screen 4 more parameters
are shown:
– rms value – peak-to-peak voltage
– frequency – period
Thus by simply pressing a key you see 9 parameters at a glance
which characterize the signal. This function applies always to
the acutal active channel.
You may also display two parameters of two different signals. In
order to achieve this deactivate the QUICK VIEW function by pres-
sing the key again, then activate channel 2 by pressing the CH2 key.
Open the following menu by pressing AUTOMEASURE
11
:
Fig. 3.9:
AutoMeasure
menu

14 Subject to change without notice
The two parameters are displayed in the right bottom corner of
the screen. You may define the parameter measurement using
this menu. After switching on MEASURE 1 and MEASURE 2 with
the appropriate softkey’s the parameter measurements are
displayed in the right bottom corner of the screen. If you press
the softkey beside TYPE you can choose the parameter you want
from the list using the general knob. This procedure is used in
all menus where choices are available. Please press the key
TYPE and choose risetime.
Fig. 3.10: Selection of parameters
Now use soft key next to Source 2 in order to select this menu item
and thus channel 2. Now the rise time of channel 1 and the mean
value of channel 2 are shown. After the menu has been closed,
the parameters can be identified by the colours of the respective
channels, (here yellow for channel 1 and blue for channel 2.)
Fig. 3.11: Measuring the parameters of two sources
3.6. Mathematical functions
In addition to cursor and parameter measurements your HMO
can also apply mathematical functions to the signals. By pres-
sing the MATH key a short menu will open which allows you to
select one or two predefined mathematical functions. A quick
setting of mathematical functions is possible by selecting the
menu item at the bottom. This mode allows you to select the
addition or subtraction of two activated sources. The formula
editor allows to predefine 5 possible mathematical functions,
it is called by pressing the MATH key (which lights up red) and
the MENU key
21
.
Fig. 3.12: Formula editor
In order to change the settings use the soft keys and the universal
knob . Here you can program and store the formulae most used.
As mentioned earlier these formulae can be quickly switched on
and off by pessing the MATH key
26
and using the appropriate
short soft menue.
3.7. Storing data
Your HMO352x can store 5 different kinds of data:
– Instrument settings
– Reference signals
– Signals
– Screen displays
– Sets of formulae.
Signals and screen displays can only be stored on USB sticks.
All other data can be stored either on a USB stick or in the
instrument’s non-volatile memories. In order to store data you
have to define the kind of data and the destination. First attach
a USB stick to the front panel connector. Press SAVE/RECALL
12
in order to call the respective menu.
Fig. 3.13: Save/Recall menu
Select the kind of data by pressing the respective soft key (in
this example SCREENSHOTS) in order to access the settings
menu.
A quick introduction

15
Subject to change without notice
Fig. 3.14: Menu SCREENSHOTS
Please verify that the USB connector into which you plugged the
USB stick (front or rear) is written in the top soft menue (You
can change the destination by opening the respective menu if
you press the softkey next to STORAGE). You can now save a
Screenshot if you press the softkey next to SAVE using the pre-
defined name written in the menu below FILE NAME. You may
name the destination memory with up to 8 characters; in order
to do this select the menu item FILE NAME and define the name
by using the universal knob and the CURSOR SELECT key.
Fig. 3.15: Defining a file name
After the soft key next to Accept was pressed the oscilloscope
will have stored the name and return to the settings menu. Here
you can now store the actual screen display by pressing the
STORE soft key. Alternatively, you can return to a lower menu
level (by pressing the lowest Menu OFF key) and select the
menu item key FILE/PRINT. In the following menu press the soft
menu key next to SCREENSHOTS: this will assign the function
Screen Shot to the key FILE/PRINT with the settings chosen.
This enables you to store a bit map file on your USB stick by just
pressing FILE/PRINT
17
at any time and in any menu.
4 Vertical system
For the vertical settings there are
the knobs for the vertical position
and the sensitivity, an always vi-
sible short menu and an extended
menu.
Fig. 4.1: Front panel area with
vertical system controls
SCALE
VOLTS / DIV
Y-POSITION
CHANNEL CONTROL
FINE
6
2
-
K
3
0
4
-
1
1
5
0
-
1
.
0
MENU
CH1
CH2
CH3
POD1
MATH
REF
X Y
CH4
POD2
18
B
19
20
22
23
24
21
25
26
27
By pushing the respective key the channel will be selected for
which these controls will be activated, this will be indicated by
the key lighting up in the color of the channel. Additionally, the
channel number on the screen will be framed and displayed
lighter than the channels not activated. The appropriate short
menu is always visible, the extended menu will be shown upon
pushing the key MENU
21
.
Fig. 4.2: Short menu for the vertical settings
4.1. Coupling
The first item to be selected is the input impedance: 1MΩ or
50Ω.
STOP
Do not connect the 50 Ω inputs to effective voltage
higher than 5 volts!
The 50 Ω input impedance should only be selected if the si-
gnal source is 50Ω, such as a generator with a 50 Ω output
where the termination within the scope is to be used. In all
other cases 1 MΩ is to be selected. Next DC or AC coupling
has to be selected: with DC coupling all components of the
signal will be displayed, with AC coupling the DC content will
be removed, the lower bandwidth is 2 Hz. Up to 250 Vrms may
be applied directly to the vertical inputs if 1 MΩ is selected.
Higher voltages can be measured with probes (up to 40 KVp).
For general applications the probes HZ350 (10:1, 10 MΩ II 12pF,
max. 400 Vp) supplied with the instrument will be used. They
are specified for the 1 MΩ input; the probe factor will be read
from the probe and factored in; they feature a 10 MΩ impedance
at low frequencies.
Vertical system

16 Subject to change without notice
Vertical system
STOP
The passive probes must be adjusted to the inputs
to which they are connected. See the probe manual
for the adjustment procedure. The PROBE ADJUST
output is only usable for 1:1 and 10:1 probes, for
100:1 or 1000:1 probes special external genera-
tors with a perfect step response have to be used.
Please use the shortest possible ground connec-
tion.
The coupling is selected in the short menu: by just pushing the
appropriate key the coupling is chosen, also the signal may be
inverted. The menu is valid for the activated channel as indicated
by the channel key light up. The channel number will be shown
in the top of the menu. By pushing the respective key of another
channel the menu will transfer to this channel.
4.2. Sensitivity, Y-Positioning, and Offset
The sensitivity of the analog inputs can be selected with the large
knob in the CHANNEL CONTROL section of the front panel in
1-2-5 steps from 1mV/div to 5V/div independent of the 50Ω or
1MΩ selection. The knob is associated with the channel selected
by pushing the respective key. The sensitivity can be changed
to continuous control by pushing the knob once. The smaller
one of the knobs is used for vertical positioning.
By pushing the MENU key the extended menu is called. On page
2 of this menu a DC offset can be added to the signal. In order
to switch this offset in the respective soft key must be pushed.
The settings window will be backlit in blue, and the activity
indicator next to the general knob will light up; the offset can
now be adjusted with the knob. The offset voltage will be added
to the signal at the vertical amplifier input offsetting it by that
amount from the zero position. The possible amount of offset
depends on the Volts/div setting chosen. The offset function
being activated will be indicated by two channel markers on
the left of the display, also visible if the menu was closed. One
marker indicates the position, the other the offset (refer to Fig.
4.3). The offset is individually adjustable for each channel.
Each analog channel may also be shifted in time by ±15 ns. This
adjustment is selected in the same menu and according to the
same method as the DC offset; it is used for compensating for
the different signal delays of voltage and current probes and
different cable lengths.
4.3. Bandwidth Limit and Signal Inversion
An analog 20MHz low pass can be inserted in the signal path
in either the short or extended menu. This will eliminate all
higher frequency interference. The filter is activated in the
short menu by pushing the respective soft key; the information
field will be backlit in blue, BW will be displayed in the channel
information window.
Signal inversion is available in the short and the extended me-
nus. If it is activated the information field will be backlit in blue,
and there will be a bar above the channel number.
4.4. Probe attenuation selection
The HZ350 probes supplied with the instrument will be re-
cognized by the instrument which automatically selects the
appropriate factor. If any other probe without automatic recog-
nition of the attenuation ratio or just a cable is connected to the
instrument, the attenuation factor can be set manually in the
extended menu. This is possible for x 1, x 10, x 100 x 1000 or as
defined by the user from x 0.001 to x 1000.
Fig. 4.3: Vertical offset in the extended menu

17
Subject to change without notice
Horizontal System (Time Base)
SCALE
TIME / DIV
X-POSITION
HORIZONTAL
TB/Z
M
E
M
O
R
Y
MENU
ACQUIRE
RUN
STOP
SET
CLR
37
D
38
37
41
39
42
43
44
40
5 Horizontal System (Time Base)
As well as time base settings, the
horizontal system comprises the
selection of the trigger position, the
zoom functions and the available
modes of signal capture. The knobs
are used for the adjustment of the
time base speed and the trigger po-
sition. The signal capture modes are
selected in the respective menus.
There is a key provided for activating
the zoom function.
Fig. 5.1: Control panel of the
horizontal system
5.1. Capturing modes RUN and STOP
The capturing modes can be selected with the key RUN/STOP.
In RUN mode signals will be continuously captured; depending
on the trigger conditions selected, and displayed, erasing the
previously captured ones. If it is desired to store and further
analyze a signal and to prevent it being overwritten, capture
must be stopped by pushing the RUN/STOP key. While in STOP
mode capture is disabled and the key will light up red.
5.2. Time base adjustments
The large knob in the HORIZONTAL section of the control panel
is used for the selection of the time base speed. The time base
speed is displayed in the upper left hand corner above the
graticule. (e.g. „TB:500ns“) To the right there is the display of
the trigger time position with respect to the normal position.
The normal trigger position is in the center of the graticule
such that 50 % of the signal display is before and 50 % is after
this trigger position. The X POSITION knob allows continuous
adjustment of the X position. The available maximum values
depend on the time base setting. By pushing the key SET/CLR
the value will be reset to its reference position. The arrow keys
37
allow you to change the X position by a fixed amount of
5 divisions in the respective direction. The key MENU opens
a menu which allows you to set the X position to its minimum
and maximum positions by just a key touch. In addition, there
is a submenu NUMER.INPUT which allows entry of an arbitrary
X position.
5.3. Capture modes
The capture modes are selected by pushing the key ACQUIRE,
this opens a display menu which offers the 5 basic modes of
capture:
– Normal:
In this mode the signals are captured and displayed.
– Roll:
This is a mode especially useful for very slow signals: the
signal „rolls“ slowly untriggered from right to left over the
screen (signals must be slower than 200kHz).
– Envelope:
In this mode the signal will be displayed as in NORMAL,
but its minimum and maximum excursions will also be
displayed such that, with time, an envelope of the signal
will be displayed.
– Average:
Functions only with repetitive signals. The universal knob in
the CURSOR/MENU section of the front panel is used to set
the number of signal periods for averaging, this is possible
in powers of 2 from 2 to 256. Please note: Averaging reduces
the bandwidth.
– Smoothing:
In this mode continuous averaging is used which allows in-
crease of the vertical resolution at the expense of bandwidth
reduction.
The second menu page is accessed by pushing the soft key
next to the menu „Page 1/2“, here, extended functions are
available:
– RANDOM SAMPL:
For very fast signals displayed with the fastest sweep speeds
it can be advantageous to switch the instrument to Random
Sampling mode; in this mode very many signal periods are
used to generate a high resolution picture, provided the
signal does not change its shape. This is equivalent to a
sampling rate of approx. 50GSa/s. The oscilloscope will
not automatically enter this mode, however, it is possible to
select automatic switching to Random sampling >20 ns/div..
The mode can be disabled by pushing the soft key.
– PEAK VALUE:
At very slow sweep speeds fast signal details will not be
visible. By selecting this mode peaks will be detected. This
function can be switched on or off in the menu, it is also
possible to select automatic switching in.
All the preceding functions are normally off. The lowest item in
the soft menu allows you to select the preferred signal capturing
repetition rate, there are 3 options:
– MAX. REP RATE:
In this mode an optimum combination of sampling rate and
memory length used will be selected automatically such that
the signal capturing rate will be maximized.
– MAX. SAMPL. RATE:
In this mode the maximum possible sampling rate will be
used.
– AUTOMATIC:
This mode is the standard mode: the instrument always
selects the optimum combination of capturing and sampling
rates (full memory length used).
5.4. ZOOM function
The HMO352x oscilloscope features a memory depth of 2 MB
per channel, this allows you to record long complex signals
which can be analyzed in detail with the ZOOM function. Push
the ZOOM key to activate this function. The screen will be par-
titioned into two graticule areas: the top one displays the whole
time base window; the lower one displays the zoomed portion of
it. The zoomed portion will be indicated in the upper display by
two blue cursors. With multi channel displays all channels will
be zoomed by the same factor and on the same portion.
In Fig. 5.2 a signal was recorded for 12ms, the zoom window
is shown with a time scale of 100μs/div. The time base speed
display in the left upper corner is shown with a grey background,
the zoom time base display is shown in white. This means that
the large knob in the horizontal menu is now available for chan-
ging the zoom factor. This knob also features a push contact; if

18 Subject to change without notice
Horizontal System (Time Base)
the knob is pushed, the time base display will change to white,
and the zoom time base display to grey: now the knob is available
for changing the time base setting. This allows you to change
time base settings without leaving the zoom mode. The position
of the zoomed portion can be moved with the small knob in the
horizontal section of the front panel over the whole captured
signal. If pushing the large knob as described above would in-
fluence the time base setting and not the zoom factor, the small
knob regains the function of shifting the trigger position so the
relationship of pre to post trigger record can be changed.
6 Trigger System
The trigger system of the HMO is
easy to handle by just observing
the HAMEG concept of instrument
operation.
Fig. 6.1: Front panel control area of
the trigger system
There are 4 keys destined for frequently used functions:
– TYPE: selects the type of trigger: SLOPE, PULSE, LOGIC,
VIDEO and the B-TRIGGER.
– SLOPE: selects the slope polarity.
– SOURCE: opens the menu for the selection of the trigger
source.
– FILTER: opens the menu for the selected trigger type in
order to select the exact trigger conditions.
Additional keys are provided for the selection of the trigger
modes: (AUTO. NORMAL, SINGLE).
6.1. Trigger modes Auto, Normal, Single
The basic trigger modes are directly selectable with the key
AUTO NORM. In AUTO mode the key will not be lit. If the key is
pushed it will light up red indicating NORMAL mode.
The oscilloscope always presents a signal in AUTO mode and
a signal will automatically yield a stable display if it fulfills the
trigger conditions.
In NORMAL mode the signal will be displayed if it fulfills the
trigger conditions, if it fails to do so the last stable triggered
display will remain on the screen.
If it is desired to record a signal which fulfills the trigger con-
LEVEL
TRIGGER
TRIG’d SLOPE
AUTO
NORM
TYPE
SOURCE FILTER
SLOPE
SINGLE
28
C
29
30
33
31
34
35
36
32
Fig. 6.2: Coupling modes with slope trigger
Fig. 5.2: ZOOM function

19
Subject to change without notice
Trigger System
ditions only once, the key SINGLE must be pushed, it will light
up white. This indicates that the single trigger mode is active,
the RUN/STOP key will blink. The next return of the signal will
cause a single capture, the oscilloscope then goes into the STOP
mode, indicated by the RUN/STOP key lighting up in red.
6.2. Trigger sources
Trigger sources are the 2 (with HMO3522) or 4 (with HMO3524)
analog channels and the external trigger input. If the optional
logic probe HO3508 with 8 or 16 logic channels is connected,
also those up to 16 digital channels can serve as trigger
sources.
6.3. Slope trigger
The simplest and most used trigger type is slope trigger, this
one is also selected in the AUTOSETUP function. Pushing the
AUTOSETUP key will hence change any previously selected
trigger type to slope trigger. For the selection of the trigger
type push the key TYPE in the trigger control section of the front
panel. A menu will open and offer the options. If the type SLOPE
was not selected (blue background) pushing the respective soft
key will change to slope. The SLOPE key is also used to step
through the options rising, falling, or both slopes. In the center
of the status line top center above the graticule the type selected
will be shown. If the key FILTER is pushed, the respective menu
will open and offer the available options.
Here the trigger signal coupling can be selected:
DC: The trigger signal is used with its dc content.
AC: The trigger signal is routed via a 5 Hz high pass filter.
HF: The trigger signal is routed via a 15 kHz high pass filter.
The trigger level is no longer adjustable. This mode
should only be used with very high frequency signals.
LOW PASS: The trigger signal is routed via a 5 kHz low pass
filter.
NOISE RED.: The trigger signal is routed via a 100 MHz low
pass filter removing higher frequency interference.
The coupling modes low pass and noise reduction can not be
simultaneously selected, but they can be used with DC or AC
coupling.
Fig. 6.3: The type B-Trigger
The slope trigger can be coupled with a so called „B Trigger“.
This option is available after pushing TYPE. This function allows
you to adjust the trigger such that first condition „A“ must be met
and then another condition „B“ before the trigger will respond
(refer to Fig. 6.3).
E.g. it is possible to define a source (channel) and a level of
120mV on the rising slope of that signal and for the second
condition a level of 80mV on the falling slope. Additionally, it is
possible to define whether the B event should occur a time (min.
8ns) or a number (min. 1) of times after the A event. The level or
time or the number of events can be entered numerically with
the universal knob or in a submenu. In order to do this first select
the setting, then push the soft key next to NUMER. ENTRY. In
the window which will open, you can enter numbers and units
with the combination of universal knob, the CURSOR SELECT
key and the visible softmenu functions.
6.4. Pulse trigger
The pulse trigger allows you to trigger on finite pulse widths of
positive or negative pulses, or ranges thereof. Select the pulse
trigger by pushing the key TYPE and the respective soft key
next to PULSE. Further settings are available in the soft menu
after pushing FILTER.
There are 6 options:
ti ≠ t: The pulse width ti is unequal to the reference width t.
ti = t: The pulse width ti is equal to the reference width t.
ti <t: The pulse width ti is smaller than the reference width t.
ti >t: The pulse width ti is greater than the reference width t.
t1<ti<t2: The pulse width ti, is smaller than the reference width
t2and greater than the reference width t1.
not(t1<ti<t2): The pulse width ti, is greater than the reference
width t2and smaller than the reference width t1.
First select the desired option and then adjust the desired re-
ference time. If you choose „ti ≠ t“ od „ti = t“, you can select the
reference time after pushing the soft key next to TIME by turning
the universal knob. If you choose the soft menu item DEVIATION
the universal knob is used to define a tolerance interval. If you
chose ti <t or ti >t, you can only define one limit. Both options
with two references (t1and t2) can be set due to pressing the re-
spective soft key and turning the universal knob. All these settings
can be combined with positive or negative pulses by selecting
the respective soft menu keys. With positive pulses the width is
defined from the rising to the falling slopes, with negative pulses
from the falling to the rising slopes. Triggering will then be on the
second slope of the pulse.
Fig. 6.4: Pulse trigger menu

20 Subject to change without notice
Display of signals
6.5. Video trigger
The video trigger allows you to trigger on PAL or NTSC standard
video signals. Select this mode by pushing the key TYPE in the
trigger control section of the front panel. The source is again
selected after pushing the key SOURCE. In the menu which
opens after pushing the key FILTER all further settings may
be performed.
First select the video standard PAL or NTSC by pushing the
respective soft key. As usual the selection will be indicated by
a blue background in the menu. The second setting will apply
to the polarity of the sync pulses. Next either the mode LINE
or FRAME can be selected. If LINE was selected, the precise
number of a desired line can be selected with the universal knob
from the 8th to the 623rd; this will be activated by pushing the
soft key next to the line number. The two other menu items allow
fast selections: LINE MIN sets the trigger line to the minimum
value, ALL LINES will cause triggering on any line. If FRAME
was chosen, the lower menu items will allow to trigger on ALL,
only the ODD or only the EVEN half frames.
7 Display of signals
The following chapter describes the selection and display of sig-
nals from various sources and the available display modes.
7.1. Display settings
The HMO352x features a high quality TFT – VGA (640 x 480 pixel
resolution) display with LED backlighting. The basic settings will
become accessible in the menus which will open after pushing
the key DISPLAY in the GENERAL section of the front panel. If
the menu item SCROLL MODE is activated, a rolling bar will
appear to the right of the graticule; a virtual display window of
20 divisions will become available which can be shifted up and
down with the universal knob. A detailed description will follow
in the next chapter.
There are 3 more menu items on the first page:
DOTS ONLY:
The respective soft menu key will toggle between ON and OFF. If
ON is activated, only the captured samples will be shown as dots.
If OFF is activated, interpolated points will be shown as well.
INVERSE LIGHT:
The respective soft menu key will toggle between ON and OFF.
If ON is activated, those display points will be shown darker
which appear most frequently. If OFF is activated, they will be
shown brighter.
FALSE COLOURS:
The respective soft menu key will toggle between ON and OFF.
If ON is activated, the color of the display points are shown
from blue over magenta, red and yellow up to white with gro-
wing number of appearing points. If OFF is activated, the most
frequently appearing ones will be shown brighter and the rarer
ones darker.
GRATICULE:
If this menu item is selected, the submenu which opens up will
allow you to choose:
LINES:
The graticule is divided into horizontal and vertical divisions.
CENTER CROSS:
There will be just one center vertical line and one center hori-
zontal line; the divisions will be marked by dots.
OFF: The screen will be empty.
INFO WINDOW:
If this menu item is selected, a submenu will open up which
allows change of the transparency of the info windows (e.g.
for showing changes of the offset) from 0 to 100 %. This is done
with the universal knob. The info windows of the POSITION
and the CURVE INTENSITIES may be switched on or off if their
respective menus are chosen.
AUX. CURSORS:
Pushing the respective soft menu key will open a submenu
which allows you to switch the auxiliary cursors for the trigger
level, the trigger time and the channel cursors on or off.
7.2. Use of the virtual screen area
The HMO graticule has 8 vertical divisions but there is a virtu-
Fig. 6.5: Video trigger menu