Iwatsu SS-7821/11 User manual

Operation Manual
Oscilloscope
SS-7821/11
SS-7810/06
IWATSU

Introduction
OThank you very much for your purchase of Iwatsu electronic measuring instruments. We
appreciate your continued patronage of Iwatsu electronic measuring instruments.
OPlease use your instrument after thoroughly reading this instruction manual and
understanding its contents. After reading this manual, please keep it in asafe place for
future reference.
Cautions for safe use
Matters that must be observed for safe operation of this instrument and for prevention of
injury to humans and damage to property are described as “^warnings” and “/K cautions”
in this instruction manual. The symbol to invoke caution is marked on the panel.
Explanation of “^warnings” and “/j\ cautions” columns in this instruction manual
/i\ Warning Incorrect operation or failure to need warnings may result in death or
serious injury.
/i\ Caution Incorrect operation or failure to need cautions may result in injury or
damage to equipment.
Explanation of the symbols on the panel
Warning symbol
This asymbol used in reference with the statements in the
instruction manual to protect human against injury and protect
this instrument against damage.
Cautions
OParts of the contents of this instruction manual may be modified without notice to
accommodate improvements in performance and function.
OReproduction of the contents of this instruction manual without previous consent is
prohibited.
History
ONov. 1994: Issue of the 1st edition
OMay. 1998: Issue of the 5th edition
KML007141 F7401-216501(B)

Be sure to read this page to assure safety. Read the next page also.
Warnings
#Do not use this instrument in aiocation where
there is expiosive gas in the vicinity.
The use of this instrument in alocation where there is explosive gas could result
In explosion.
#lf there is any smoke, abnormal odor, or abnormal
sound coming display type this instrument,
immediately set the power switch to STBY and
disconnect the power cord.
Use of this instrument under these conditions could result In electrical shock or
fire. After setting the power switch to STBY and disconnecting the power cord,
contact one of our service offices for repair. Repair by the user is dangerous and
should be strictly avoided.
#Take care to not allow water to get into this
instrument or the wetting of this instrument.
The use of this instrument in awet state could result In electrical shock or fire. If
water or other foreign matter has gotten into this instrument, first set the power
switch to STBY and remove the power cord and then contact one of our service
offices for repair.
#Do not place this instrument on an unstable place
such as on ashaky stand or on aslant.
The dropping or turning over of this instrument could result in electrical shock,
injury, or fire. If this instrument has dropped or its cover has been damaged, first
set the power switch to STBY and remove the power cord and then contact one
of our sen/ice offices for repair.
#Do not allow any foreign matter such as metal or
inflammable substance to get in from the air hole,
etc.
The entrance of any foreign matter display type the ventilation port, etc., could
result in fire, electrical shock, or power failure. If any foreign matter has entered,
first set the power switch to STBY and remove the power cord and then contact
one of our service offices for repair.
-II-

Be sure to read this page to assure safety. Read the next page also.
/1\ Warnings (cont’d)
#Be sure to use a3-core power cord.
Failure to use a3-core power cord could result in electrical shock or power
failure.
•When supplying power display type a2-wire receptacle using a3-core/2-core
conversion adapter, be sure to connect the grounding terminal of the 3-core/2-
core conversion adapter to ground.
•When supplying power display type a3-wire receptacle using the attached 3-
core power cord, the grounding wire of the power cord is connected to ground.
#Use this instrument with the rated AC power
supply.
Use of this instrument with avoltage other than specified could result in electrical
shock, fire, or power failure. The usable power voltage range (90 to 132 VAC or
180 to 250 VAC) is marked on the rear panel.
#Be sure to connect the ground side of probes and
input connectors to the grounding potential of the
object being measured.
If the grounding lead is connected to potential other than the ground, electrical
shock or other accidents (damages to the object being measured, the instrument
itself or other units connected to the instrument) may occur (refer to the “Example
of improper configuration” shown below).
[Example of improper configuration]
The chassis assumes a
voltage of 100 Vand is dangerous.
+100 and chassis short circuit.
lead
When measuring the floating potential, measurement by the differential method
(CHI and CH2 input) is recommended (refer to the example shown below).
[Example of recommended measurement method]
Main body
-III

Be sure to read this page to assure safety. Read the next page also.
/KWarnings
#Do not remove either the cover or panel.
There are high-voltage parts inside the cover and panel and touching any of them
could result in electrical shock. Please contact one of our service offices for any
inspection, calibration, or repair.
#Take sufficient care when measuring high
voltages.
Touching ahigh-voltage part during measurement could result in electrical
shock.
#When carrying this instrument with ashoulder
bag, use only an appropriate bag.
If an inappropriate shoulder bag is used, the instrument may drop and cause
injury.
If there are any questions concerning the safety of ashoulder bag, such as
broken seams or weakened straps, do not use the bag.
#When handling the power cord, strictly observe
the following:
Failure to heed this Inspection could result in fire or electrical shock. If the power
cord has been damaged, contact one of our service offices (at the end of this
volume) for repair,
•Do not modify the power cord. •Do not pull the power cord.
•Do not bend the power cord forcibly. •Do not heat the power cord.
•Do not twist the power cord. •Do not moisten the power cord.
•Do not bundle the power cord. •Do not place aheavy object on the
power cord.
#Do not modify this instrument.
Modification of this instrument could result in electrical shock, fire, or power
failure. Repair of amodified instrument may be refused.
-IV-

Be sure to read this page to assure safety. Read the next page also.
A\Cautions
#Be sure to use aspecified fuse (<j>5 x20 mm, 250 V, 2A, SLOW) when
replacing the fuse.
The use of afuse other than aspecified one could result in fire or power failure.
Disconnect the power cord when replacing the fuse.
#Be sure to use athree-core power cord suitable for the supply voltage.
The use of acord that is not suitable for the supply voltage may cause fire.
Also, the use of atwo-core power cord may cause electrical shock.
#Be sure to connect and disconnect the power cord after setting the power
switch to STBY.
Connection and disconnection of the power cord with power supplied could result
in electrical shock or power failure.
#When disconnecting the power cord display type the receptacle, pull it by
holding the plug.
Pulling by the cord may damage the cord and could result in fire or electrical
shock.
#Avoid use of any damaged cable or adapter.
The use of any damaged cable or adapter could result in fire or electrical shock.
#Avoid placing any object on this instrument.
If any object is placed on this instrument, the cover may contact the internal
circuity and could result in electrical shock, fire, or power failure.
#Do not place any object in the vicinity of the air hole or fan of this
instrument.
Placing any object in the vicinity of the air hole or fan may generate internal heat
and could result in fire or electrical shock.
#Do not place this instrument in alocation with ahigh degree of moisture or
dust.
Placing this instrument in alocation with ahigh degree of moisture or dust could
result in fire or electrical shock.
#When using this instrument in an upright position, take care not to allow it
fall over.
The falling over of this instrument could result in injury, fire, or electrical shock.
#When probes or measuring cables, etc. are connected to this instrument,
take care not to cause this instrument to fall over by pulling them.
The falling over of this instrument could result in injury, fire, or electrical shock.
#Do not use this instrument if it has failed.
The use of this instrument in astate of failure could result in fire or electrical
shock. In the case of failure, contact one of our service offices for repair.
-V-

Be sure to read this page to assure safety.
/?\ Cautions
#Always use this instrument only within the rated operating range.
The use of this instruction out of the rated operating range could result in power
failure. The temperature and humidity ranges that allow the use of this
instrument are as follows:
Operation :Indoor use only
Temperature ;0°Cto+40“C
Relative humidity :90% or less (at O'C to +40“C)
#Do not apply voltage to an input terminal exceeding the posted rating.
Applying avoltage exceeding the posted rating could result in power failure. The
maximum voltage than can be applied is as follows:
•SS-7821
Direct :±400 V(DC+ACpeak)
With probes equivalent to SS-082R (10:1) :±600 V(DC+ACpeak)
•SS-7811/7810/06
Direct :±400 V(DC+ACpeak)
With probes equivalent to SS-0130R (10:1) :±600 V(DC+ACpeak)
[Note] The maximum input voltage derates depending on frequency and high
voltage pulse of an Input signal.
#Do not raise trace or character intensity beyond what is necessary.
The use of an Intensity beyond what is necessary could result in eye fatigue or
burn in of the CRT.
#Leave space side and rear.
When using this instrument in acabinet or putting on the other instruments, the
scope may overheat, it could result failure of operation and specifications,
contact our Service Office.
#To assure safety, be sure to disconnect the power cord if the instrument is
not to be used for along period.
#When transporting this instrument, be sure to use the original packing
material that came with the instrument or other packing material that is
equal or superior.
Large vibrations and/or shocks applied to the instrument during transpiration
could result in power failure and fire. If there is no appropriate packing material
and/or cushion material, consult one of our service offices.
When using acarrier, label “precision machine” on each face of the packing box.
-VI-

Contents
Cautions for safe use
Warnings
Cautions
Unpacking
Components
Replacement of built-in battery
Section 1.Controls, Connectors and Indicators
1.1
Front Panel
1.2 RearPanel 3
Section 2. Basic Operation 4
2.1 Displaying CAL signal with AUTO SET 6
2.2 Probe Compensation T
2.3 Display Adjustment 8
2.4 Vertical and Horizontal Positioning 9
2.5 Vertical Deflection System 9
2.5.1 Deflection Factor 9
2.5.2 Input Coupling 10
2.5.3 Display Channels 1
1
2.5.4 ALT and CHOP 11
2.5.5 Sum (ADD) and Difference (INV) 12
2.5.6 Bandwidth Limiter 12
2.6 Sweep Rate and Magnification 13
2.6.1 Sweep Rate 13
2.6.2 Magnification
2.7 Sweep Mode
2.7.1 Repetitive Sweep
2.7.2 Single Sweep
2.8 Triggering
2.8.1 Trigger Source 15
2.8.2 Trigger Coupling 15
2.8.3 Trigger Slope 16
2.8.4 Trigger Level 16
2.8.5 TV Signal 17
2.9 Horizontal Display 18
2.10 Trace Separation 19
2.11 Delayed Sweep 20
2.11.1 Continuous Delay 20
2.11.2 Triggered Delay 21
2.12 Holdoff 22
-VII-

Section 3. Cursor Measurement and Counter 23
3.1 Time Difference (At) and Frequency (1/At) 23
3.2 Voltage Difference (AV) 25
3.3 Counter 26
Section 4. Save/Recall 27
4.1 Save 27
4.2 Recall 27
Section 5. Daily Inspection 28
Sections. Specifications 21
SS-500/501/502/505(CH2 0UT, ZAXISIN) 36
Probe SS-082R 37
Probe SS-01 30R/01 31 R38
-VIII-

Unpacking
The figure below depicts the unpacking procedure.
•SS-7821/7811/7810/06 1
•Accessories
Power cord (three-core type) 1
Probe (10:1) 2
For SS-7821 :SS-082R
For SS-781 1/10/06 :SS-0130R
Front cover 1
Fuse 2
Instruction manual 1
Replacement of built-in battery
•The built-in battery is not commercially available. Please contact your nearest sales
representative to obtain areplacement.
•If the battery is exhausted, the setup conditions are initialized when the power is turned
on.
-IX-

Memo

Section 1.Controls, Connectors and Indicators
1.1 Fronipanel
See Figure 1.1.1.
Figure 1.1.1 Front Panel I
0Adjustment of the power source and screen
iPOWER I:Used to set the AC power source to ON/STBY.
[INTEN] :Adjusts the intensity of traces (refer to "2.3 Display Adjustment").
[READOUT] :Adjusts the intensity of characters (refer to "2.3 Display Adjustment").
[FOCUS] :Adjusts the focus (refer to "2.3 Display Adjustment").
[SCALE] :Adjusts the intensity of the scale (refer to "2.3 Display Adjustment").
[TRACE ROTATION] :Adjusts the rotation of traces (refer to "2.3 Display Adjustment").
(DCalibration voltage output and grounding terminals
CAL connector :Outputs calibration voltage signals. This terminal is used for operation check of this instrument
and adjustment of probe waveform (refer to "2.1 Displaying CAL Signal with AUTO SET").
1(grounding) connector :This is the grounding for measurement.
(DVertical axis
INPUT connectors (CHI to CH3) :Connections for input signals.
[VOLTS/DIV] (CHI ,CH2) :Select the voltage deflection factor (refer to "2.5.1 Deflection Factor").
150mV,1 00mV, 500mVI(CHS) :Selects the voltage deflection factor (refer to "2.5.1 Deflection Factor").
[POSITION?] (CHI to CHS) :Move the position in the vertical direction (refer to "2.4 Vertical and Horizontal
Positioning").
IDC/AC I(CHI to CHS), IGND I(CHI ,CH2) :Select the input coupling (refer to "2.5.2 Input Coupling").
ICHI I,ICH2 1,ICH3 1:Select the channel to be displayed on the screen (refer to "2.5.3 Display Channels").
IADDI :Displays the sum of CHI and CH2 (refer to "2.5.5 Sum (ADD) and Difference (INV)").
IINV I:Displays the input of CH2 in reversal (refer to "2.5.5 Sum (ADD) and Difference (INV)").
^Horizontal section, etc.
[TIME/DIV] :Selects the sweep rate (refer to "2.6.1 Sweep Rate").
[POSITIONS] .1FINE I:Move the position in the horizontal direction (refer to "2.4
Positioning").
Magnifies ten times horizontally (refer to "2.6.2 Magnification").
Selects ALT or CHOP (refer to "2.5.4 ALT and CHOP").
Limits the bandwidth (refer to "2.5.6 Bandwidth Limitation").
Vertical and Horizontal
1

Figure 1.1.2 Front Panel II
(DTriggering section
IAB I:Selects Asweep or Bsweep (refer to 2.1 1Delayed Sweep"). The indicator lights when Bsweep is
selected.
[TRIG LEVEL] :Selects the trigger level (refer to "2.8.4 Trigger Level").
ISLOPE I:Selects the trigger slope (+, -)(refer to "2.8.3 Trigger Slope").
ISOURCE I:Selects the trigger signal source (CHI, CH2, CHS, LINE, VERT), (refer to "2.8.1 Trigger Source").
ICOUPL I:Selects the trigger coupling mode (AC, DC, HF REJ, or LF REJ) (refer to "2.8.2 Trigger Coupling").
\W\ :Selects triggering with TV (BOTH, ODD, EVEN, or TV-H) (refer to "2.8.5 TV Signal").
TRIG'D indicator :Lights when atrigger pulse has been generated.
READY indicator :Lights while waiting for signals.
(D=horiz display -
C.A..J ,IBI,IX-Yl :Select the displaymode (refer to "2.9 Horizontal Display"). ALT sweep can be selected
by pressing rAland msimultaneously.
(Z) “SWEEP MODE =
IAUTO I. [NORM I:Select repetitive sweep (refer to "2.7.1 Repetitive Sweep").
ISGL/RST I:Selects single sweep (refer to "2.7.2 Single Sweep").
(DFUNCTION, autoset, etc.
IAUTO SET I:Measuring conditions are set automatically, (refer to "2.1 CAL wave display with AUTO
[FUNCTION]
=CURSORS =
IAV-At-OFF I
ITCK/C2 I
SAVE/RECALL I:
HOLDOFF
I
DELAY/TRACE SEP
SET.")
The delay time, cursor position, etc. can be set by turning or pressing this knob. Fine adjust-
ment can be effected by turning this knob. Coarse adjustment in the direction this knob has
been turned so far can be effected each time this knob is pressed or continuously held down.
Selects At (time difference measurement), AV (voltage difference measurement), or OFF (re-
lease of measurement) (refer to "Section 3. Cursor Measurement and Counter").
Selects the type of cursor to be moved (Clor C2 or tracking) (refer to "Section 3. Cursor
Measurement and Counter").
Selects Save or Recall (refer to "Section 4. Save/Recall").
Selects HOLDOFF (refer to "2.12 Holdoff").
]:Selects DELAY (refer to "2.1 1Delayed Sweep") or TRACE SEP (refer to "2.1 0Trace Sepa-
ration").
2

Section 2. Basic Operation
ACautions
#Be sure to connect or remove the power cord after setting the power switch to STBY.
#Use this instrument with the rated AC power suppiy.
Voltage range :100 to 120 VAC
Frequency :50/60 Hz
Power consumption :110VA max.
#Be sure to use a3-core power cord appropriate to the suppiy voitage.
#Do not piace any object in the vicinity of the air hoie or fan of this instrument.
#Use this instrument within the rated operating range.
Temperature: 0to +40 °C, humidity: 90%RH (at 40 °C)
#Power is appiied to this instrument if the power switch is set to STBY. Disconnect the
power cord from the receptacle if the instrument is not to be used for a long time.
#Do not apply voltage to the input terminal exceeding the posted rating.
•CH1, CH2, CHS input
Direct :±400 Vmax.
With the SS-082R/SS-0130R (10 :1) or equivalent :±600 Vmax.
[Note] The maximum input voltage derates depending on frequency and high voltage pulse of an
input signal.
#Do not raise trace or character intensity beyond what is necessary.
This instruction is for two purposes: 1) to protect the user's eyes from eye strain and fatigue, and
2) to protect the CRT from burn-in.
General
Perform basic operation using CAL output and asignal generator so as to become familiar with this instrument.
The Iwatsu FG-350 is used for the signal generator.
OSymbols on the panel
•AWarning symbol
This symbol calls the users' attention to the description in the instruction manual. This symbol is marked
near the CHI, CH2, and CH3 INPUT terminals.
OSymbols in the instruction manual
Expression of keys and knobs
I I :Indicates akey.
[]:Indicates aknob.
OPower switch
Indicates astate wherein this instrument is ready for ON operation with power supplied to every
circuit.
Indicates astandby state of this instrument wherein the STBY main power supply is off.
When AC power is connected to AC LINE INPUT, power is supplied to the only microprocessor
in this instrument.
When AC power is not connected to AC LINE INPUT, panel setup conditions are backed up by
the built-in battery.
4

0How to read the screen
•Main contents of display
ACWPPP RATP ^trigger iATRIGGER iATRIGGER
AbWbbRHAlb; 30URCE iSLOPE iCOUPLE ATRIGGER
LEVEL —
HOLDOFFTIME
oo-T,. :B TRIGGER is TRIGGER :B TRIGGER
BSWEEP RATE
j;g^^p^ |COUPLE BTRIGGER
LEVEL DELAY TIME
FUNCTION MODE
Measurement of AV or At Frequency
measured
CH1 iRange Setting
of ADD Coup-
ling CH3 jRange iCoup-
i
ling
Sweep
enlarge-
ment
Limit of
band-
width
•An example of the display
A^0|JS CH1 +DC -t.OOmV
B1ps CH2 -DC 3.00mV HO :100%
DLY 99.00 /7S
f:B-DELAY
A
1:
At= 5.00^JS 1/At =200.0kHz f=200.00 kHz
lOOmV +2: i200mV 3; 500mV ±MAG BW
OLoading effect of the probe
If acable, etc. is directly connected to the circuit under measurement, the input impedance of the measuring
instrument works as aload and may cause hindrance in measurement. The RC of this unit is “1 MQ, 20 pF.” If
a10:1 probe is used, it becomes the following value, where the loading effect is largely reduced and highly
accurate measurement is enabled.
SS-7821 :10MQ, 13pF
SS-7811 ;10MQ, 12.5pF
OGrounding
Connect the measurement grounding terminal (left side of CHI INPUT) to GND of the circuit being measured.
Grounding is particularly important to measure high-frequency signals accurately. Connect the grounding lead of
the probe as closely as possible to the grounding terminal near the signals.
OSettings when power is set STBY or OFF
When power is set STBY or OFF, the panel setup immediately before such setting is stored. When power is
turned on again, operation restarts with the panel setup immediately before the setting to STBY or OFF. When
power is set to OFF, the panel setupis backed up by the built-in batteries.
The state where the power cord is disconnected.
5

2.1 Displaying CAL Signal with AUTO SET
Display the CAL waveform (1 kHz, 0.6 Vsquare wave) on CH1 using the AUTO SET function of this instrument.
Operating method
Procedures
0Press IPOWER Ito turn on the power.
•Traces, characters, or both are displayed on the screen.
0Connect the CHI input connector and CAL connector with the
attached probe.
Connector of probe CH1 signal input connector
Tip of probe -* CAL connector
(3) Press IAUTO SET I.
•The CAL waveform is displayed on the screen.
•If the CAL waveform does not appear, adjust the intensity (refer
to "2.3 Display Adjustment").
OAUTO SET function
•Press IAUTO SETl in astate such that "the size of signal is unknown, frequency is unknown, or operation
mode is unknown." This instrument automatically selects the measurement conditions suitable for observa-
tion (as listed below), based on the amplitude and/or frequency of the input signal and the waveform is
displayed on the screen.
•Sometimes suitable measurement conditions cannot be found depending on the frequency, amplitude, and/
or duty ratio of the input signal.
OMeasurement conditions of AUTO SET
Verticai defiection system Triggering
Deflection factor
VOLTS/DIV :2mV to 5V/div with an ampli-
tude of approx. 2to 7div at fre-
quencies between 50 Hz to 50
MHz
VARIABLE :OFF (CAL)
A/B :A
SOURCE :Detected in the order of CH1 and
CH2
COUPL :DC
TV :OFF
SLOPE :+
LEVEL :About 0div
Display channel
CH1 :Former setting
CH2 :Former setting
CH3 :OFF (non display)
CH1 alone is set to ON if both CH1 and CH2
have been set to OFF.
Horizontai defiection system
HORIZ DISPLAY :A
Sweep rate
•SS-7821
20 ms to 10 ns/div, approx. 2.5 to 5cycles
•SS-781
1
20 ms to 20 ns/div, approx. 2.5 to 5cycles
VARIABLE :OFF
SWEEP MODE :AUTO
POSITION :Sweep starts display type a
position near the left end of the
screen.
POSITION
In case of 1-channel display :In the middle
In case of 2-channel display
CH1 :About +2div
CH2 :About -2div
AC/DC ;AC
GND :OFF (GND released)
ALT/CHOP :CHOP
CH2INV :OFF
BW 20 MHz :OFF (no limits on bandwidth)
6

2.2 Probe Compensation
Adjust the wavetorm on the attached probe. Be sure to confirm that the waveform of the probe is compensated
correctly before using the probe.
Operating method Procedures
(DSet this unit as follows:
CH1 VOLTS/DIV:10 mV
GND :OFF (GND released)
AC/DC :DC
SOURCE :CHI
SEC :200 \is
(DTake triggering by turning [TRIG LEVEL] .
(DAdjust the waveform by turning the variable capacitor of the
probe with ascrewdriver.
•Correctly compensated waveform
i- •Over compensated waveform
•Under compensated waveform
OProbe sense (display of deflection factor)
When the probe has aprobe sense function, the voltage as com-
pensated by the attenuation ratio of the probe is displayed.
7

2.3 Display Adjustment
Adjust the brightness (INTEN), displayed characters (READOUT), focus (FOCUS), intensity of scales (SCALE), and
rotation of traces (TRACE ROTATION).
Operating method
Procedures
0Adjust the brightness of traces by turning [INTEN] .
4-(DPress [INTEN (BEAM FIND)] .
•Compresses the vertical and horizontal deflection to within the
graticule area.
•Return to the original state after confirmation.
i- (3)Adjust the brightness of displayed characters by turning
[READOUT] .
•ON/OFF is switched each time [READ OUT] is pressed.
0Adjust the focus of traces and displayed characters by turning
[FOCUS] .
OUse [FOCUS] to adjust when the brightness of the trace has been turned up too far.
OWhen the difference in brightness between the (READOUT) and (TRACE) becomes too large, the focus of
both will become blurred. Turn [INTEN] or [READOUT] to adjust to the same brightness.
OWhen the brightness of SS-7821 is increased, the focus is automatically corrected.
And then READ OUT intensity brighten and intensity difference between TRACE and READ OUT is
decreased.
(DAdjust graticule illumination by turning [SCALE] .
•Perform step (D and (Z) if trace is inclining due to earth magne-
tism, etc.
i- (DSet the input coupling of CH1 to GND by pressing IGNDI .
A5ms CH 1+AC
l:5mV
i- (ZCorrect the inclination of the trace by turning TRACE ROTATION
on the front panel with the attached adjustment screwdriver.
•Return the input coupling to the original setting after correcting
the inclination.
8

2.4 Vertical and Horizontal Positioning
Adjust the vertical and horizontal positions. This function is used to move the waveform to aposition where it can
be observed easily or when performing comparative measurement of two or more waveforms by laying one
waveform on another.
Operating method Procedures
Mmm§ w(i[r1iD©iil
0Turn [APOSITIONT] of CH1 to the right; the waveform moves
upward.
(DTurn [APOSITIONT] of CH1 to the left; the waveform moves
downward.
OPerform the same operation on CH2 and CH3 as well.
-4-- -4 —
-4—-4--
Mmm§ (p)@@iD{Q)in]i
(DTurn [POSITIONP- ]to the right; the waveform moves to the
right.
(DTurn POSITIONS* ]to the left; the waveform moves to the
left.
(3)The FINE indicator lights or goes off every time IFINE Iis
pressed.
•Fine adjustment is accomplished when [POSITIONS] is
turned while the FINE indicator is lighted. If [POSITIONS ]is
fully turned in this case, the waveform scrolls. To stop scrolling in
the middle, return [<<P0SITI0NP] slightly.
2.5 Vertical Deflection System
2.5.1 Deflection Factor
Set the amplitude of waveform to asize suitable for viewing.
a. CHI and CH2
Operating method
1:10 mV 2: 10 mV ^
T
Display of deflection factor
l:>10mV 2: 10 mV +-
—T
Indicates setting is uncalibrated
b. CH3
3: 500 mV 4-
selected. Fine adjustment is not available.
9
Procedures
i©®5[n)f fc TOilWOW
0Select the deflection factor by turning [VOLTS/DIV] of CHI
.
•The deflection factor can be selected with arange of 2mV/div to 5V/div (in
1-2-5 steps).
•The deflection factor is displayed in the lower lefthand corner of the screen.
[Note] Do automatic calibration if traces move upward or downward when the
range has been switched (refer to "Section 5. Daily Inspection).
(DPress [VOLTS/DIV] of CHI; the deflection factor is displayed with ">"
mark.
•Fine adjustment can be performed using this screen.
(DTurn [VOLTS/DIV] of CHI ;the deflection factor varies continuously be-
tween steps
.
•"CHI VAR LIMIT" is displayed when the set value reaches the maximum or
minimum value.
•To release the variable setting mode, delete ">"by pressing [VOLTS/DIV]
again.
OPerform the same operation on CH2 as well.
Procedures
0Select the deflection factor by pressing 150 mV -100 mV -500 mV] of CH3.
•One of the three ranges of 50 mV/div, 100 mV/div, and 500 mV/div can be