Iwatsu SS-7847A User manual

Jan. 2014：Issue of the 2nd edition
A35-524030（B）
KML057521

−II−
Be sure to read this page to assure safety.
Warnings
Read the next page also.
●Do not use this instrument in a location where
there is explosive gas in the vicinity.
The use of this instrument in a location where there is explosive gas could result in
explosion.
●If there is any smoke, abnormal odor, or abnormal
sound coming from this instrument, immediately
set the power switch to STAND-BY 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 STAND-BY and disconnecting the power cord,
contact one of our service offices for repair. Repair by the user is dangerous and
shouldbestrictlyavoided.
●Take care to not allow water to get into this
instrument or the wetting of this instrument.
The use of this instrument in a wet 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 STAND-BY 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 a shaky stand or on a slant.
Thedroppingorturningoverofthisinstrumentcouldresultinelectricalshock,injury,
or fire. If this instrument has dropped or its cover has been damaged, first set the
powerswitchtoSTAND-BYandremovethe powercord andthen contactone ofour
service offices for repair.
●Do not allow any foreign matter such as metal or
inflammable substance to get in from the air hole,
etc.
Theentranceof any foreign matter from the ventilation port, etc., could result in fire,
electrical shock, or power failure. If any foreign matter has entered, first set the
powerswitchtoSTAND-BYandremovethe powercord andthen contactone ofour
service offices for repair.

−III−
CH1
INPUT CH2
INPUT
Main body
Grounding
lead
Ground side
Probe
Probe
ADD : ON (CH1 + CH2)
INV : ON (CH2 Inverted)
+110 V R+100 V
CH1 INPUT
The chassis is connected
to the ground. +110 V
R
+100 V
Main body
Probe
Grounding lead
The chassis assumes a
voltage of 100 V and is dangerous.
＋100 and chassis short circuit.
Be sure to read this page to assure safety.
Warnings
Read the next page also.
(cont'd)
●Be sure to use a 3-core power cord.
Failure to use a 3-core power cord could result in electrical shock or power
failure.
・When supplying power from a 2-wire receptacle using a 3-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 from a 3-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 a voltage other than specified could result in electrical
shock, fire, or power failure. The usable power voltage range (100 to 240 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]
When measuring the floating potential, measurement by the differential method
(CH1 and CH2 input) is recommended (refer to the example shown below).
[Example of recommended measurement method]

−IV−
Warnings (cont'd)
Be sure to read this page to assure safety. Read the next page also.
●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.
Touchinga high-voltage part duringmeasurementcouldresult in electrical shock.
●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)forrepair.
・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 a heavy 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 a modified instrument may be refused.
●Please make GND of this product and GND of
power supply (PS-26) for the current probe the
same potential and use them when you use this
product, current probe (SS-240A/250), and power
supply (PS-26) for the current probe.
The current might flow from the terminal on the GND side to power supply (PS-26)
and current probe (SS-240A/250) for the current probe when the terminal GND of
the power supply for the current probe and the current probe is connected basides
the terminal GND of this product, and it cause the electric shock and damage.

−V−
Cautions
Be sure to read this page to assure safety. Read the next page also.
●Be sure to use a specified fuse (φφ
φφ
φ5 x 20 mm, 250 V, T5A) when replacing the
fuse.
The use of a fuse other than a specified one could result in fire or power failure.
Disconnect the power cord when replacing the fuse.
●Be sure to use a three-core power cord suitable for the supply voltage.
The use of a cord that is not suitable for the supply voltage may cause fire.
Also, the use of a two-core power cord may cause electrical shock.
●Be sure to connect and disconnect the power cord after setting the power
switch to STAND-BY.
Connectionanddisconnection ofthepowercordwith powersuppliedcouldresultin
electrical shock or power failure.
●When disconnecting the power cord from 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.
Placinganyobject inthevicinityoftheairholeor fanmaygenerateinternalheat and
could result in fire or electrical shock.
●Do not place this instrument in a location with a high degree of moisture or
dust.
Placing this instrument in a location with a high 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.
Thefalling over of this instrument could result in injury,fire,orelectricalshock.
●When probes or measuring cables, etc. are connected to this instrument,
take care not to cause this instrument to fall over by pulling them.
Thefalling over of this instrument could result in injury,fire,orelectricalshock.
●Do not use this instrument if it has failed.
The use of this instrument in a state of failure could result in fire or electrical shock.
In the case of failure, contact one of our service offices for repair.

−VI−
Cautions
Be sure to read this page to assure safety.
(cont'd)
●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 ℃to +40 ℃
Relativehumidity : 90% or less (at 0 ℃to +40 ℃)
●Do not apply voltage to an input terminal (CH1, CH2, CH3, CH4 and Z AXIS
IN) exceeding the posted rating.
Applying a voltage exceeding the posted rating could result in power failure. The
maximum voltage than can be applied is as follows:
・CH1, CH2, CH3, CH4 input
Direct
At 1 MΩ: ±400 V (DC+ACpeak)
At 50 Ω(CH1, CH2) : 5 V rms
With SS-101R (10:1) or equivalent : ±600 V (DC+ACpeak)
・ZAXIS IN : ±40 V (DC+ACpeak)
[Note] The maximum input voltage derates depending on frequency and high
voltage pulse of an input signal.
●Please use power supply PS-26 for the current probe when current probe
(SS-240A/250) is connected and used for this product.
●Do not raise trace or character intensity beyond what is necessary.
Theuseofanintensitybeyond what is necessary could result in eye fatigue or burn
in of the CRT.
●To assure safety, be sure to disconnect the power cord if the instrument is
not to be used for a long 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 transportation
couldresultinpowerfailureandfire. Ifthereis noappropriate packingmaterial and/
or cushion material, consult one of our service offices.
When using a carrior, label "precision machine" on each face of the packing box.
●Cleaning should be limited to the exterior of the instrument only, using a damp, soft
cloth. Donot usechemicals or abrasiveelements. Under nocircumstancesshould
moisture be allowed to penetrate the oscilloscope. To avoid electric shocks,
disconnectthe instrument fromthe power supplybeforecleaning.

−VII−
Contents
Introduction.......................................................................................................................................... I
Cautions for safe use .......................................................................................................................... I
Warnings .......................................................................................................................................... II
Cautions .......................................................................................................................................... V
Unpacking .......................................................................................................................................... IX
Components........................................................................................................................................ IX
Explanations of terms ......................................................................................................................... X
Section 1. Operating Points............................................................................................................... 1
1.1 Front Panel ....................................................................................................................... 1
1.1.1 The power source and screen.................................................................................... 2
1.1.2 Vertical axis ................................................................................................................ 3
1.1.3 Horizontal Axis, etc. .................................................................................................... 4
1.1.4 Trigger Section and Display Mode Section ................................................................. 5
1.1.5 Functions, Cursors, Sweep Modes, etc. .................................................................... 6
1.2 Rear Panel........................................................................................................................ 7
Section 2. Basic Operation................................................................................................................ 8
2.1 Displaying CAL Signal with AUTO SETUP ....................................................................... 10
2.2 Probe Compensation........................................................................................................ 12
2.3 Adjustment of the screen.................................................................................................. 13
2.4 Vertical and Horizontal Positioning ................................................................................... 14
2.5 Vertical Deflection System................................................................................................ 15
2.5.1 VerticalSensitivity....................................................................................................... 15
2.5.2 Inputcoupling.............................................................................................................. 16
2.5.3 Input resistance .......................................................................................................... 17
2.5.4 Display Channels........................................................................................................ 18
2.5.5 ALT and CHOP........................................................................................................... 18
2.5.6 Sum and Difference.................................................................................................... 19
2.5.7 Bandwidth limiter ........................................................................................................ 19
2.5.8 Offset.......................................................................................................................... 20
2.5.8.1 CH1/CH2 offset ...................................................................................................... 20
2.5.8.2 PROBE P1/P2 offset.............................................................................................. 21
2.6 A Sweep and B Sweep ..................................................................................................... 22
2.7 Sweep Rate and Magnification ......................................................................................... 23
2.7.1 Sweep Rate................................................................................................................ 23
2.7.2 Magnification(MAGx10) .............................................................................................. 23
2.7.3 CH2 Delay Adjust (CH2 DLY) ..................................................................................... 24
2.8 Sweep Mode ..................................................................................................................... 25

−VIII−
2.8.1 Repetitive sweep ........................................................................................................ 25
2.8.2 Single Sweep.............................................................................................................. 25
2.9 Triggering.......................................................................................................................... 26
2.9.1 Trigger Source............................................................................................................ 26
2.9.2 Trigger Coupling ......................................................................................................... 26
2.9.3 Trigger Slope (SLOPE) .............................................................................................. 27
2.9.4 Trigger Level ............................................................................................................... 27
2.9.5 TV Signal .................................................................................................................... 28
2.9.5.1 TV signal modes and the number of lines .............................................................. 28
2.9.5.2 TV Clamp ............................................................................................................... 29
2.9.6 Event Trigger .............................................................................................................. 30
2.10 Horizontal Display............................................................................................................. 32
2.11 Trace Separation .............................................................................................................. 33
2.12 Delayed Sweep ................................................................................................................ 34
2.12.1 Continuous Delay ....................................................................................................... 34
2.12.2 Triggered Delay .......................................................................................................... 36
2.13 Holdoff............................................................................................................................... 37
Section 3. Cursor Measurement and Counter ................................................................................... 38
3.1 Time Difference (Δt) and Frequency (1/Δt) Measurement ............................................. 38
3.2 Voltage Difference (ΔV) Measurement ............................................................................ 40
3.3 Counter............................................................................................................................. 41
Section 4. Save/Recall ...................................................................................................................... 42
4.1 Save ................................................................................................................................. 42
4.2 Recall ............................................................................................................................... 44
Section 5. Daily Inspections............................................................................................................... 45
Section 6. Specifications ................................................................................................................... 48
Probe SS-101R................................................................................................................................... 53

−IX−
Unpacking
The figure below depicts the unpacking procedure.
Components
Check that the following items are included:
・SS-7847A ............................................... 1
・Accessories
Power cord (three-core type).................... 1
Panelcover.............................................. 1
Fuse ........................................................ 2
Operationmanual..................................... 1
Accessory bag......................................... 1
Probe SS-101R....................................... 2
(Probe accessories are included)
Rear packing
Main body
Polyethylene bag
Front packing
Packing box

−X−
Explanations of terms
A sweep : Ordinary sweep system
ADD : DisplayofthesumofCH1waveformandCH2waveform(abbreviationfromADDITION)
AC (input coupling) : An input coupling system where a filter is applied to the input circuit so that the DC (direct
current) component is removed from the signal
AC (trigger coupling) : A trigger coupling system where a filter is applied to the trigger circuit so that the DC (direct
current) component is removed from the signal
ALT(vertical) : Mutually switched sweep of multiple waveforms on the same screen (abbreviation from
ALTERNATE)
ALT(horizontal) : Display of A sweep and B sweep on the same screen (abbreviation from ALTERNATE)
ATTACH : Selection of the object channel for cursor measurement or offset
B sweep : The sweep system used for delayed sweep
BEAM FIND : Display of the waveform that was outside the screen in the screen (abbreviation from BEAM
FINDER)
B ENDS A : To increase the intensity by shortening A sweep with delayed sweep (refer to "2.12 Delayed
Sweep").
BOTH : Both of the odd- and even-numbered fields of the vertical synchronizing TV signals
BURST : One of event triggers, where a triggering is set when the time interval of the trigger signal
exceeds the specified length (refer to "2.9.6 Event Trigger").
BWL : Limitationontheverticalbandwidth(abbreviationfromBANDWIDTHLIMITATION)
CAL : A signal for calibration, which is used for calibration of deflection factor and the check of the
operationofthisinstrument(abbreviationfromCALIBRATION)
CH : Channel(abbreviationfromCHANNEL)
CHOP : Mutually switched display of multiple waveforms on the same screen
CLAMP : Display of the back porch of TV signals as converted into that on the reference level (ground
level)
COUPLING : Synchronous coupling system
COUNT : One of event triggers, where a triggering is set when the specified numbers of B trigger signals
are counted after the A trigger signal occurred (refer to "2.9.6 Event Trigger").
CRT : Cathoderaytube
DC (input coupling) : The input coupling system that allows the passage of both DC and AC signals
DC (trigger coupling) : The trigger coupling system that allows the passage of both DC and AC signals
DIV : Division
EVEN : Even-numberedfieldsof verticalsynchronizing TVsignals

−XI−
EVENT : Event trigger (this unit has the COUNT and BURST types)
FET : Field effect transistor
FETprobe : An active probe with an FET at the tip
GND : Grounding
H cursor : The cursor used for measuring time by moving in the horizontal direction
HDTV : TVsystemofhigh-definitiontype(abbreviationfromHIGHDEFINITIONTELEVISION)
HFREJ : Low-passfilterforremovinghigh-frequencybands(abbreviationfromHIGHFREQUENCY
REJECTION)
HOLDOFF : Holdoff time (facilitate the observation of complex pulse signals by adjusting the holdoff time)
HORIZ : Horizontal
INDEP : Movethecursorindependently(abbreviationfromINDEPENDENCE)
INTEN : Intensity,brightnessofthescreen(abbreviationfromINTENSITY)
INV : Inverting theverticaldisplayonthescreen(abbreviationfrom INVERSION)
LF REJ : High-passfilter forremoving low-frequencybands (abbreviationfrom LOWFREQUENCY
REJECTION)
LINE (trigger signal source) : One of trigger signal sources. A power line is used as a trigger signal source.
LINE(TV) : Line No. of horizontal synchronization signal
MAG : Magnifyingwaveforminthehorizontaldirection(abbreviationfromMAGNIFY)
MAX : Maximumvalue
NTSC : Acolortelevisionsystem(abbreviationfromNATIONALTELEVISIONSYSTEMCOMMITTEE)
ODD : Odd-numberedfieldsofvertical synchronizingTV signals
PAL : A color television system (abbreviation from PHASE ALTERNATION BY LINE)
READOUT : Intensityofcharactersdisplayed(abbreviationfromREADOUTINTEN)
RH : Relativehumidity
RECALL : Recalling the setting conditions saved in the built-in memory
RST : Reset
SAVE : Saving the panel key setting conditions in the built-in memory
SCALE : Illuminationofthescaleonthe CRT(abbreviationfromSCALEILLUMINATION)
SECAM : A color television system (abbreviation from SEQUENTIEAL COULEUR A MEMOIRE in French)
SEP : SeparatingAsweep and Bsweep from eachother(abbreviation fromSEPARATION)
SGL : Sweepingonlyonce(abbreviationfromSINGLE)
SLOPE : Triggerslope

−XII−
SOURCE : Triggersignalsource
TCK : Movingcursors whilemaintainingthe intervalsbetweenthem(abbreviationfromTRACK)
TRACE ROTATION : Adjusting the inclination of a trace so that it matches with the horizontal division
TRIG : Trigger
Tr (risetime) : A pulse response characteristic - the time during which the momentary value of the rise portion
is 10 to 90% of the basic amplitude
TV-H : Horizontal synchronizing TV signals
TV-H : Vertical synchronizing TV signals
V cursor : The cursor used for measuring voltage by moving in the vertical direction
VSWR : Voltagestanding waveratio
X-Y : A system where different signals are input and displayed on the X and Y axes so as to observe
the frequency ratio and/or phase difference between two signals

−XIII−
Memo

−XIV−
SS-7847A Bandwidth
◇The SS-7847A oscilloscope has a vertical axis range of 5 mV/div to 50 mV/div and a bandwidth of
470 MHz for both CH1 and CH2.
◇Sincetheabove rangeisthree timesthebandwidth of156MHz, itisideal forobservingITU-T (formerly
CCITT),G.703 andotherhigh-speed communicationsnetworks.
◇In a vertical axis range of 2 mV/div and 100 mV/div to 5 V/div for CH1 and CH2 the bandwidth is
440 MHz.
◇The total range of CH3 and CH4 is 400 MHz.
◇When an SS-101R probe is used, the bandwidth is 400 MHz.
◇Maximum frequencies for the A sync and B sync are 400 MHz and 250 MHz respectively.
Bandwidth(MHz) MaximumFrequency (MHz)
Range CH1/CH2 CH3/CH4 SS-101RProbe A Sync B Sync
2 mV/div 440 MHz
5 mV/div
10 mV/div 470 MHz
20 mV/div
50 mV/div 400 MHz 400 MHz 250 MHz
0.1 V/div 400 MHz
0.2 V/div
0.5 V/div 440 MHz 400 MHz
1 V/div
2 V/div
5 V/div

1
Section 1. Operating Points
1.1 Front panel
Figure 1.1.1 shows the overall view. Refer to page 2 and the pages that follow for details.
Figure 1.1.1 Front Panel I(Overall view)
Symbols on the panel
Warning symbol
This symbol calls the user's attention to the descriptions in the instruction manual. This symbol is marked near the
CH1 to CH4 INPUT terminals.
Symbols in the instruction maual.
Expression of keys and knobs
: Indicates a key.
【】: Indicates a knob. There are two types of knobs as follows:
・To be operated by turning.
・To be operated by turning and pressing.
When two switches are pressed simultaneously, they are expressed with a symbol of "+" inserted between
them.
[Example] : A + B
◊
◊

3
1.1.2 Vertical axis
See Figure 1.1.3.
Figure 1.1.3 Front Panel II
①INPUT connectors (CH1 to CH4):
Connections for input signals.
[Note] Strictly observe the maximum limit on the input voltage as displayed on the panel.
②【【
【【
【95V-2mV :】】
】】
】PUSH VARIABLE (CH1, CH2) knob:
VOLT/DIV switch: Selects the vertical sensitivity in 1-2-5 seteps (refer to "2.5.1 Vertical Sensitivity ").
VARIABLE switch: Finely adjusts the vertical sensitivity (refer to "2.5.1 Vertical Sensitivity ").
③100mV/500mV (CH3, CH4) key:
Select the vertical sensitivity (refer to "2.5.1 Vertical Sensitivity ").
④POSITION【【
【【
【▲▼】】
】】
】(CH1 to CH4) knob:
Move the position in the vertical direction (refer to "2.4 Vertical and Horizontal Positioning").
⑤DC/AC (CH1 to CH4) key:
Select the input coupling (refer to "2.5.2 Input Coupling").
⑥GND (CH1, CH2) key:
Connect the input coupling to the GND (refer to "2.5.2 Input Coupling").
⑦50ΩΩ
ΩΩ
Ω/1MΩΩ
ΩΩ
Ω(CH1, CH2) key:
Select the input resistance. The indicator lights when 50Ωis selected (refer to "2.5.3 Input Resistance").
⑧CH1, CH2, CH3 and CH4 ON/OFF key:
Select the channel to be displayed on the screen (refer to "2.5.4 Display Channels").
⑨ADD CH1 + CH2 key:
Displays the sum of CH1 and CH2 (refer to "2.5.6 Sum and Difference").
⑩INV key:
Displays the input of CH2 in reversal (refer to "2.5.6 Sum and Difference").
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4
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1.1.3 Horizontal Axis, etc.
See Figure 1.1.4.
Figure 1.1.4 Front Panel III (Horizontal Section, etc.)
①【【
【【
【9 s-ns :】】
】】
】PUSH VARIABLE knob:
TIME/DIV switch : Selects the sweep rate in 1-2-5 steps (refer to "2.7.1 Sweep
Rate").
A VARIABLE switch: Finely adjusts the sweep rate (refer to "2.7.1 Sweep Rate").
②POSITION【【
【【
【9 :】】
】】
】knob:
Roughly adjusts the position in the horizontal direction (refer to "2.4 Vertical and
Horizontal Positioning").
③FINE key:
Finely adjusts the position in the horizontal direction (refer to "2.4 Vertical and
Horizontal Positioning"). The indicator lights when FINE is selected.
④MAG X 10 key:
Magnifies the waveform (x 10) in the horizontal direction (refer to "2.7.2 Magnification").
⑤ALT CHOP key:
Selects ALT or CHOP (refer to "2.5.5 ALT and CHOP"). The indicator lights when CHOP is selected.
⑥BWL key:
Selects the frequency band (refer to "2.5.7 Bandwidth limiter").
⑦PROBE POWER P1, P2 terminals:
Supply power to FET probes.
⑧CAL terminal:
Outputs calibration voltage signals. Used for operation check of this unit and the adjustment of the probe
waveform (refer to "2.1 Display of CAL Waveform With AUTO SET").
⑨Connector:
This is the grounding for measurement.

5
1.1.4 Trigger Section and Display Mode Section
See Figure 1.1.5.
①TRIG LEVEL【【
【【
【5 6】】
】】
】knob:
Selects the trigger level (refer to "2.9.4 Trigger Level").
②READY indicator:
Lights while waiting for signals.
③TRIG'D indicator:
Lights when a trigger pulse has been generated.
④A B key:
Selects A (sweep and trigger) or B (sweep and trigger)
(refer to "2.12 Delayed Sweep").
The indicator lights when B is selected.
Figure 1.1.5 Front Panel IV (Trigger
SectionandDisplayModeSection)
⑤SLOPE key:
Select the trigger slope (+, -) (refer to "2.9.3 Trigger Slope").
⑥HOLDOFF key:
Selects the holdoff time (refer to "2.13 Holdoff").
⑦SOURCE key:
Select the trigger signal source (CH1, CH2, CH3, or LINE) (refer to "2.9.1 Trigger Source").
⑧COUPLING key:
Select the trigger coupling mode (AC, DC, HF REJ, or LF REJ) (refer to "2.9.2 Trigger Coupling").
⑨TV key:
Selects triggering with TV (BOTH, ODD, EVEN, or TV-H) (refer to "2.9.5.1 TV Signal").
⑩EVENT/TV CLAMP key:
Selects event (refer to "2.9.6 Event Trigger") or TV clamp (refer to "2.9.5.2 TV Clamp").
-HORIZ DISPLAY (display mode) -
⑪A or B key:
Displays A sweep or B sweep (refer to "2.10 Horizontal Display"). Simultaneous depression of A and B
selects ALT sweep.
⑫DELAY/TRACE SEP key:
Selects DELAY (refer to "2.12 Delayed Sweep") or TRACE SEP (refer to "2.11 Trace Separation").
⑬X-Y key:
Effects X-Y display (refer to "2.10 Horizontal Display").
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