Keithley 194 User manual

Instruction Manual
Model 194
High Speed Voltmeter
01985, Keithley Instruments, Inc.
Instrument Division
Cleveland, Ohio, U.S.A.
Document Number: 194-901-01 Rev. A

SAFETY PRECAUTIONS
The following safety precautions should be observed before using the Model 194.
This instrument is intended for use by qualified personnel who recognize shock hazards and arc famili.lr
with the safety precautions required to avoid possible injury. Read over this manual carefully before operating
the instrument.
Exercise extreme caution when a shock hazard is present at the instrument’s input. The American National
Standards Institute (ANSI) states that a shock hazard exists when voltage levels greater than 3OV RMS 01
42.4V peak are present. A good safety practice is to expect that a hazardous voltage is present in any unknown
circuit before measurement.
Do not exceed 3OV RMS between input low and earth ground.
Inspect your test leads for possible wear, cracks, or breaks before coachuse.
For maximum safety, do not touch the test leads or the instrument while power is applied to the circuit undrr
test. Turn the power off and discharge all capacitors before connecting or disconnecting the instrument.
Do not touch any object which could provide a current path to the common side of thr circuit under test
or power line (earth) ground. Always make measurements with dry hands while standing on ‘1dry, insulated
surface capable of withstanding the voltage being measured.
Do not exceed the instrument’s maximum allowable input as defined in the specifications and operation
section of this manual.

SPECIFICATIONS
CHANNEL 1
-- ~..l..y.~.I...u..~u
INPUT IMPEDANCE: l.lMt, (I.OMll on 200” range) shunted by
<47pF.
MAXIMUM ALLOWABLE INPUT: 250” peak, 2xlO’V*Hz.
MAXIMUM COMMON MODE VOLTAGE: 30” rms, 42V Peak,
SxlO~“.Hz.
COMMON MODE RE,ECTfON RATIO: >6OdS at dc to IkHz, IkR
unbalance.
DIFFERENTIAL NONLINEARITY: Ih-Bit: 52 LSD. 8 bit: 50.5 LSB.
TEMPERATURE COEFFlClENT (Of’-18T & **^-5o”c,: < -t(O.l Y
applicable accuracy specification)i”C.
DYNAMIC CHARACTERISTICS
16BIT 8 BIT
Minimum SampleRate
10,s (;;ktfz) 1ps (IMHz)
Maximum Sample Rate IS
Sample Rate Resolution lOOX loons
Number of Samples 1 to 32k 1 t” 65k
Sample interval Accuracy
(typical, excluding time base
accuracy, 0.4”s 2ns
SIGNALINOISE RATIO: 5OdB for full range IOOkHz sine input.
SLEW RATE: 13”lps minimum.
SETTLING TIME: 1 gs to 0.1% of final value.
CHANNEL CROSSTALK: <6OdB at SOOkHz.
INPUT CO”PI.ING: Ac, dc, ground.
FREQUENCY RBSPONSE (Filter Off,:
O.ZdB IdlJ 3dB
dc (15Hz) 20kHz dc @Hz) 20OkHz dc (2Hz) 750kt tz
( ) indicates ac coupled performance.
LOW PASS FILTER: 50kHz, 500kHz, single pole.
TRIGGER CHARACTERISTICS
DELAY:
Pm-Trigger: -Zk<n<-1,Mbitmode; -@kc”<-1.8.bitmod
In/ samples are stored prior to triggering.
Past-Trigger: 1<n < 1x 10’. Storage begins “n” samples after tri
gWi”g.
TRIGGER:
SOURCE DESCRlPTlON
Input Signal Slope: + or
Level: Selectable over input voltage
range and resolution.
External: Negative TTL edge.
Front Pane,: Manual pushbutton.
IEEE-488 Interface: 16 programmable trigger modes.
Other Channel: ,nterna,,y generated.
TIMESASE: Internal: IOMHZ *o.o*%.
Extenta,: IOMHZ nominal, Tn..
e.
6.
I
MATH FUNCTIONS
A”ERAGE: ~1%
” = v...,
PEAK TO PEAK: Difference between maximum and minimum v.,,ws
of samples.
PLUS PEAK: Maximum va,w of samples.
MINUS PEAK: Minimum value of samplcs~
II I
z: (V,-TV...,’
STANDARD DE”,AT,ON: s-u II
TRUE ROOT MEAN SQUARE: II
n 2
INTEGRAL: (‘I*“.+%“..,+ ,F, V.) 1,
DIFFERENCE: Channel 1 Channrl 2,
RATIO: Channel 1 / Chnnncl 2.
v,: Voltage of sanlple i,
n: Total number of samples,
i: Locn,ion of individual ssmplc.
t,: Sample intewa,.
ANALOG OUTPUT
MODES 0”TPuTS USED
CRT x, y, z (blanking)
Oscilloscope y, %(trigger)
Slow Plot x, y, z (pen upidown)
Strip Chart y
x OurPUT: O-10” I”,, scale. 2.44mV rfS”I”ti0”.
Y OUTPIJT: 0.,ov full scale, 2.44mV rCSO,“ti”n
z 0”TP”T: 0”. 5v or 15”.
ZOOM MAGNIFICATION: O.,:, to 1O”O:l
PAN: Across entire memory.
REAL TIME (DMA) OUTPUT
FORMAT: Binary, I&bit or S-bit.
RATE: Same as Sample Rate.
CONTROL LINES: End of Sample, Overrun, tligh Byte. I.ow t,yW

1 FRONT PANEL PROGRAMS 1 1 GENERAL
[
0 IEEE ADDRESS: Set IEEE address.
1 SELF TEST: Performs internal RAM and ROM check.
2 DIGITAL CALIBRATION: Executes calibration procedure.
3 CALlBRATlON STORAGE: Stores calibration constants in
NVRAM.
4 x an-PUT FULL SCALE: Sets full scale x output voltage.
5 Y OUTPUT FULL SCALE: sets full scale Y output voltage.
6 Z OUTPUT BLANKING LEVEL: Sets high or law blanking level.
IEEE-488 BUS IMPLEMENTATION
M”LTH.INE COMMANDS: DCL, LLO, SDC, GET, GIL “NT,
“NL, SPE,SPD,MIA, Mm
“NILINE COMMANDS: IFC, REN, EOI, SRQ, ATN.
INTERFACE FIJNCTIONS: SH1, AHI, T6, no, Lb, LEO, Slu, RLI,
PPO, DC1, DTI, CO, El.
PROGRAMMABLE PARAMETERS: Range, Math Functions, Zero,
Delay, Sample Rate, Number of Samples, Trigger, Calibration, Out-
put Format. Self Test, Display, Status, Service Request, Storage,
Filter, Terminator, fnput Coupling, Buffer Size, Channc,, Saw and
Recall Setups, Front l’anel Frograms 1.6, key Sequence, Slope,
Analog Outputs, EOI.
BINARY TRANSFER RATE: 90k bytesisecond.
DISPLAY: Fourteen-digit alphanumeric LED display. Function and
IEEE bus status also displayed.
RANGING: Manual or autoranging.
WARMUP: One hour to rated accuracy.
OPERATING ENVIRONMENT: 0” to 50°C, 0% to 80% relative
humidity up to 35°C.
STORAGE EN”IRONMENT: -25” to 65°C.
POWER: 105.125” or 210.250” (internal switch selectable), 50117.or
6OHz. 12O”A maximum. 90-110” and 180-220” version available
upon request.
CONNECTORS: All Ii0 connectors are BNC except Real Time Out-
put (“B-25, and IEEE-488 connectors.
DIMENSIONS, WEIGHT: 89mm high x 435mm wide x 448mm
deep (3% in. x 17%in. x 17% in.). Net weight 9.Ikg (20 Ibs.), Dual
Channel unit.
ACCESSORIES AVAILABLE:
Model 1938: Fixed Rack Mounting Kit
Model 1939: Slide Rack Mounting Kit
Model 1944: Channel 2
Model 7007-I: Shielded IEEE-488 Cable, Im (3.2 ft.)
Model 7007-Z: Shielded IEEE-488 Cable, 2m (6.5 ft.)
Model 7051.2: BNC Interconnect Cable, 2 ft.
Model 7051-5: BNC lntcrconnect Cable, 5 ft.
Model 7754.3: BNC to Alligator Cable, 3 ft.
Model 7755: 5On Feed-Through Terminator
Model 8573A: IEEE-488 Interface for IBM PC, PC-AT
Model 194 High Speed Voltmeter
Specificafi~ns subject to chrn,qe withuut notice.

Contains an overview of the instrument including
features, unpacking instructions, as well as available
accessories.
SECTION 1
General Information
Includes an overview of front panel controls, rear
panel configuration, and fundamental measurement
procedures. Use this section to get your instrument
up and running as quickly as possible.
SECTION 2
Getting Started
This section contains detailed operating information
for the Model 194, and the Model 1944 A/D Module.
Use this section as a reference on all front panel
operating aspects of the instrument.
SECTION 3
Operation
Contains information on connecting the Model 194
to the IEEE-488 bus and programming the instru-
ment from a computer.
SECTION 4 ~
IEEE-488 Programming
Outlines procedures necessary to verify that the in-
SECTION 5 i
strument is operating within stated specifications.
Performance Verification ~
A complete description of operating principles for
the instrument is located in this section. Analog,
digital, microcomputer, and power supply circuits
are described, as is the IEEE-488 interface.
SECTION 6
Principles of Operation ~
Details maintenance procedures including fuse re-
placement, option installation, line voltage selection,
calibration, and troubleshooting.
SECTION 7
Maintenance
Includes replacement parts information, schematic
diagrams, and component location drawings for the
SECTION 8
Models 194 and 1944.
Replaceable Parts

TABLE OF CONTENTS
SECTION l-GENERAL INFORMATION
1.1 INTRODUCTION ............................................................................. l-l
1.2 FEATURES............................................................................~ ....... i-1
1.3 WARRANTYINFORMATION ................................................................... 1-l
1.4 MANUAL ADDENDA.. ....................................................................... l-2
1.5 SAFETY PRECAUTIONS AND TERMS .......................................................... l-2
1.6 SPECIFICATIONS ............................................................................. l-2
1.6.1 Resolution.. ................................................................................ l-2
1.6.2 Differential Non-Linearity .................................................................... l-2
1.6.3 Slew Rate ................................................................................... ~1-2
1.6.4 Input Impedance and Coupling, .............................................................. l-2
1.6.5 Common-Mode Considerations ............................................................... 1-3
1.6.6 Crosstalk ................................................................................... I-4
1.6.7 DC Voltage Accuracy and Dynamic Characteristics. ............................................. l-4
1.6.8 Settling Time ................................................................................ I-4
1.7 UNPACKING AND INSPECTION .............................................................. l-5
1.8 PREPARATION FOR USE.. .................................................................... ~1-5
1.9 REPACKINGFORSHIPMENT .................................................................. l-5
1.10 ACCESSORIES ................................................................................ l-5
SECTION 2-GETTING STARTED
2.1 INTRODUCTION ............................................................................. 2-l
2.2 FRONT PANEL FAMILIARIZATION ............................................................ 2-l
2.2.1 Controls .................................................................................... 2-1
2.2.2 Display ..................................................................................... 2-8
2.2.3 IEEE-488 Status Indicators .................................................................... 2-Y
2.2.4 TiltBail ..................................................................................... 2-Y
2.3 REAR PANEL FAMILIARIZATION .............................................................. 2-Y
2.4 POWERUPPROCEDURE ..................................................................... 2-12
2.4.1 Power Line Connections ..................................................................... 2-12
2.4.2 Power Up Self Test and Display Messages .................................................... 2-13
2.5 BASIC MEASUREMENT TECHNIQUES ........................................................ 2.14
2.5.1 Warmup Period ............................................................................ 2.14
2.5.2 Input Connections .......................................................................... 2-14
2.5.3 Fundamental Control Selection .............................................................. 2:14
2.5.4 Measurement Procedure ..................................................................... 2.35
2.6 SAMPLES, MEASUREMENTS AND READINGS ................................................ 2.15
2.6.1 Definitions ................................................................................. 2-15
2.6.2 Sampling Discussion ........................................................................ 2-X
2.7 TYPICAL OPERATING MODES ............................................................... 2-16
SECTION 3-OPERATION
3.1 INTRODUCTION ............................................................................. 3;l
3.2 GENERAL DISPLAY MESSAGES ............................................................... 3-2
3.3 RANGE SELECTION .......................................................................... 3-2
3.3.1 Autoranging ................................................................................ 3-2
3.3.2 Uprange .................................................................................... 3-2
3.3.3
Downrange .................................................................................
3-3
3.3.4 Range Selection Considerations. .............................................................. 3-3
3.4 DATA ENTRY ................................................................................. 3-3
3.4.1 DataKeys .................................................................................. 3-3
I

3.4.2
3.4.3
3.4.3
3.4.5
3.4.6
3.5
3.5.1
3.5.2
3.5.3
3.6
3.6.1
3.6.2
3.6.3
3.6.4
3.6.5
3.6.6
3.6.7
3.7
3.8
3.9
3.9.3
3.9.2
3.9.3
3.9.4
3.10
3.10.1
3.10.2
3.10.3
3.11
3:12
3.12.1
3.12.2
3.12.3
3.12.4
3.12.5
3.12.6
3.12.7
3.w
3.13.1
3.13.2
3.13.3
3.33.4
3.13.5
3.13.6
3.13.7
3.14
3.14.1
3.14.2
3.15
3.16
3.16.1
3.16.2
3.17
3.18
3.19
3.20
3.20.1
3.20.2
3.20.3
ENTER ..................................................................................... 3.4
CANCEL....................................................; .............................. 3.4
FREQiTIME ................................................................................. 3.4
Using the Cursor Keys ....................................................................... 3.4
Data-Entry Examples ........................................................................ 3.5
RATE AND SAMPLES PROGRAMMING ....................................................... 3-5
Programming Sampling Rate ................................................................. 3-6
Programming the Number of Samples ........................................................ 3-6
Samples and Rate Selection Considerations. ................................................... 3-8
TRIGGERING ................................................................................ 3-9
Trigger Source .............................................................................. 3-10
Single/Continuous Arming Modes ........................................................... 3-10
TRIGGER Button Operation ................................................................. 3-10
Trigger Delay ............................................................................... 3-11
Trigger Slope ............................................................................... 3-13
Trigger Level ............................................................................... 3-W
External Triggering .......................................................................... 3-14
1NPLJT COUPLING ..................................................... .................... 3-14
RECALLING DATA.. ......................................................................... 3-15
DLJALCHANNEI. OPERATION ............................................................... 3-16
Channel 2 Connections ..................................................................... 3-16
Channel Selection .......................................................................... 3.16
Speed Considerations ....................................................................... 3-17
Cross Channel Triggering .................................................................... 3-17
USING ZERO ................................................................................ 3-17
Zeroing From an Applied Signal ............................................................. 3~18
Keying In the Zero Value .................................................................... 3-18
Zero Mode Considerations .................................................................. 3-18
FILTERING .................................................................................. 3-19
USING THE ANALOG OUTPUT .............................................................. 3-21
Analog Output Connections ................................................................. 3.21
Entering the XY Mode (XY MODE) 3-22
Analog Output Data Source (XY DATA) ..................................................... : 3.23
Triggering the Analog Output (XY TRIG). .................................................... 3.24
Scaling the Analog Output (XY ZOOM). ..................................................... 3.24
Controlling the Analog Output Viewed Data (XV PAN) ........................................ 3.25
Setting Maximum Analog Output Levels ..................................................... 3-27
MATHEMATICAL FUNCTIONS ............................................................... 3-29
Average ................................................................................... 3-30
True RMS ................................................................................. 3.30
Peak ...................................................................................... 3.31
Peak-to-Peak ............................................................................... 3-31
Standard Deviation. ........................................................................ 3.32
Integral .................................................................................... 3.32
WaveformMode ............................................................................ 3.33
RATIOANDDIFFERENCE ................................................................... 3.33
DifferenceMode ........................................................................... 3.33
RatioMode ................................................................................ 3.34
STATUS ..................................................................................... 3.34
SETUP MODE ............................................................................... 3-35
RecallinaSetuus ........................................................................... 3.35
Saving SYetups'..............................................
FRONT PANEL PROGRAMS (OTHER KEY OPERATION) ........
RESET .......................................................
EXTERNAL CLOCK ...........................................
REAL TIME OUTPUT .........................................
Signal Lines.. ..............................................
Reading Real Time Data ......................................
Computer Interfacing.. ......................................
.............
.............
.............
.............
.............
.............
......
......
......
......
......
......
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......
......
......
......
......
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3.35
3-36
3-36
3-37
3-38
3-38
3-39
3.40
ii

3.21
3.21.1
3.21.2
3.21.3
321.4
3.21.5
3.22
3.22.1
3.22.2
3.22.3
3.22.4
3.22.5
3.22.6
3.22.7
MEASUREMENT CONSIDERATIONS ...
Ground Loops .......................
RF1 .................................
Instrument Loading Effects. ...........
Input Capacitance Effects ......... ...
AC Frequency Response Considerations
TYPICAL APPLICATIONS ..............
Periodic Waveform Analysis ...........
Long Term Measurements .............
Digital Storage Oscilloscope ...........
Dual-Channel V&meter ..............
Catch a Falling Pulse .................
Reducing Noise in the Measured Signal
Mechanical Vibration Testing ..........
SECTION 4-IEEE-488 PROGRAMMING
4.1
4.2
4.3
4.4
4.5
4.6
4.6.1
4.6.2
4.6.3
4.7
4.7.1
4.7.2
4.7.3
4.8
4.8.1
4.8.2
4.8.3
4.8.4
48.5
4.8.6
4.8.7
4.8.8
4.9
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
4.9.8
4.9.9
4.9.10
4.9.11
4.9.12
4.9.13
4.9.14
4.9.15
14.9.16
4.9.17
4.9.18
4.9.19
._....
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,.........
,.........
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,....,
......
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......
......
3-43
3-43
3-43
344
3-44
3-45
3-40
3-46
3-47
3.47
3.48
?-4X
3-x
3-5 I
INTRODUCTION ............................................................................. 4-l
A SHORTCUT TO IEEE488 OPERATION .................... ................................. 4-I
BUS CONNECTIONS ......................................................................... 1-3
INTERFACE FUNCTION CODES ....................... ................................... ... J-6
PRIMARY ADDRESS SELECTION .............. ................................... ...... ... 4-h
CONTROLLER PROGRAMMING ........................ ........................ ......... 4-7
LunIrOlier tlanaier sorrware ............................ ................. ...... ...... .. -t-i
BASIC Interface Programming Statements. ............... .......... ...... ...... .......... 4-i
Model 8573 Software Configuration ................ .......... ...... ...... ...... ........ 4-H
FRONT PANEL ASPECTS OF IEEE-488 OPERATION .. .......... ...... ...... ................. 4-8
Front Panel Error Messages
IEEE-488 Status Indicators
............... ....... ........................ 4-N
..................................... .......... 4-10
IX)CALKey.....................................................................~ .......... 4mlU
GENERAL BUS COMMAtiD PROGRAMMING ................ ........................ ...... &lO
REN(Remote Enable) ....................................................................... 4.11
IFC(Interface Clear) ........................................................................ 412
LLO(LocalLockout).............................................................~ .......... 4-12
GTL(GoTo Local) .......................................................................... 4.12
DCL (Device Clear) ......................................................................... 4.13
SDC (Selective Device Clear) ..................................................... ......... 4-14
GET (Group Execute Trigger) .......... .......... ...... .......... ...... ...... ......... 4-14
Serial Polling (SI’E, SPD) .... ..................................................... ......... 4-15
DEVICE-DEPENDENT COMMAND PROGRAI\?MING ...... .......... ...................... 4-15
Execute (X) ....... ........................................................................ 4.20
Function(F) ............................................................................... 4.20
Range(R) .................................................................................. 4-21
Rate(S) ................................................................................... 4.22
Number of Samples(N) .................................................................... 4-22
Trigger Mode (T) ........................................................................... 4-23
Delay(W) ................................................................................. 4-25
Data Format(G) ............................................................................ 4.26
Analog Output(O) ......................................................................... 4-30
BufferPointer Control(B).....................................................~ ............. 4-31
Reading Buffer Control (Q). .......................................................... ...... 4-32
Filter(P) ................................................................................... 4.34
Zero (Z) ................................................................................ .. 4-34
Input Coupling(I) ...................................................................... .. 4-35
status (U) ................................................................................. 4-35
SRQ Mode (M) and Status Byte Format ..................................... ................ 4-40
Channel (C) ............................................................................... 4-43
EOI and Bus Hold-off Modes (K) ............................................................ 444
Terminator (Y) ................................................................ ............ 4-45
iii

4.9.20 Save (L) ......................................................
4.9.21 Recall(A) .....................................................
4.9.22 Hit Button (II) .............. ............ ....................
4.9.23 Display (D) ...................................................
4.9.24 Self Test(J) ...................................................
4.10 TRANSLATOR MODE ............................ ...... ......
4.10.1 Defining Translator Words (ALIAS) .............................
4.10.2 Enabling and Disabling the Translator Mode (KNEW and OLD)
4.10.3 Combining Translator Words ............................ ......
4.10.4 Reading Back Translator Words (LIST). ..........................
4.10.5
Purging Translator Words (FORGET) ............................
4.11 BUS DATA TRANSMISSIOX TIMES. .............................
SECTION 5-PERFORMANCE VERIFICATION
,...,
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......
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......
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.,....
4-46
4-47
4-47
4-48
4-49
4-50
4-50
4-52
4-53
4-53
4-54
4-54
3.1 1NTRODUCTION ............................................................................. 5-l
5.2 ENVIRONMENTALCONDITIONS ............................................................. 5-l
5.3
5.4
5.5
5.6
5.7
5.71
5.72
5.8
INITIAL CONDITIONS
RECOMMENDED TEST EQUIPMENT .................
TEST EQUIPMENT CO1
‘JNECTIONS ...................
VERIFICATION PROCEDI JR1
COMPUTERIZED VERIFICATION ......................
HP-85 Verification Program
IBh? PC/Model 8573 Verification Program
AC FREQUENCY RESPONSE
SECTION 6-PRINCIPLES OF OPERATION
6.1
6.2
6.3
6.3.1
6.3.2
6.4
6.4.1
6.4.2
6.4.3
6.4.4
6.4.5
6.5
6.5.1
6.5.2
6.5.3
6.5.4
6.5.5
6.5.6
6.5.7
6.5.8
6.5.9
6.6
6.6.1
6.6.2
6.6.3
6.6.4
6.6.5
6.6.6
6.6.7
6.6.8
... 5-l
....................................... 5-l
....................................... 5-2
....................................... 5-2
....................................... 5-3
....................................... 5-3
....................................... 5-5
....................................... 5-6
INTRODUCTION ............................................................................. 6-l
FUNCTIONALDESCRIPTION ................................................................. 6-l
ANAU)GCIRCU~RY ......................................................................... 6-3
BlockDiagram .............................................................................. 6-3
Circuit Description .......................................................................... 6-3
A!D CONVERTER ............................................................................ 6-4
Converter Block Diagram .................................................................... 6-4
Converter MDdule ........................................................................... 6-6
FaraIlel-to-Serial Data Conversion ............................................................. 6-8
Data Transmission Control ................................................................... 6-8
Serial Control ............................................................................... 6-8
DIGITAL CONTROL CIRCUITRY. .............................................................. 6-9
Block Diagram of Digital Circ~uitry ...................................................... ..... 6-9
Isolator Data Transmission, ................. ................................................ 6-11
Serial-to-Parallel Data Conversion ... ..............................
Sample Counter ..................................................
Digital Trigger Comparator Circuits. ................................
Trigger Period Control Logic .......................................
64K Byte Dual-Port Memory .......................................
Digital Control-to-Microprocessor Interfacing Circuits ................
Non-Volatile Memory Circuits (NVRAM) ............................
MlCROCOMI’UTER ................................................
Microcomputer Block Diagram .....................................
68008 Microprocessor .............................................
Clock and Reset Circuits ..........................................
Address Decoder .................................................
Control Circuits .......................... .......................
Memory Circuits ..................................................
Buffers ..........................................................
IEEE-488 Interfacing ...............................................
.... ...................
........................
6-12
6-12
6-12
6-13
6-13
6-14
6-N
6-14
6-14
6-16
6-16
6-17
6-U
h-18
6.la
6-E
iv

6.7 I/O (Input/Output) Circuitry. .............................
6.7.1 I/O Block Diagram. ....................................
6.7.2 Bus Buffering ..........................................
6.7.3 Display and Keyboard Interface ..........................
6.7.4 Serial and NVRAM Control .............................
6.75 Analog Output Interfacing ..............................
6.8 POWER SUPPLIES.. .....................................
6.8.1
Power Supply Block Diagram. ...........................
6.8.2 Power LineInput .......................................
6.8.3 Digital Supplies ........................................
6.8.4 Analog Supplies .......................................
6.9 DISPLAYBOARD ........................................
6.9.1 Block Diagram of Display Board .........................
6.9.2 Circuit Description .....................................
SECTION -/-MAINTENANCE
.................
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6-l’)
6.1Y
6-21
h-21
6-21
h-21
6.2~1
b-21
h-22
h-23
h-23
h-21
6-24
h-25
7.1
7.2
7.3
7.3.1
7.3.2
7.4
7.4.1
7.4.2
7.5
ix.1
7.5.2
7.5.3
7.5.4
7.5.5
7.5.6
7.6
7.7
7.7.1
7.7.2
7.7.3
7.7.4
7.7.5
7.8
7.8.1
7.8.2
7.8.3
7.8.4
7.8.5
7.8.6
7.8.7
7.8.8
7.8.9
7.8.10
7.9
7.10
7.11
INTRODUCTION .............................................................................. 7.1
LINE VOLTAGE SELECTION ................................................................... 7-l
FUSE REPLACEMENT ......................................................................... 7-2
Line Fuse Replacement ....................................................................... 7-2
Digital Supply Fuse Replacement ............................................................. 7-2
OPTION INSTALLATION.. .................................................................... 7-2
Installation Procedures ....................................................................... 7.2
Module Recognition Programming ............................................................ 7-6
CALIBRATION ........................................................................... ... 7-h
Recommended Calibration Equipment ......................................................... 7-h
Environmental Conditions, ......................................................... ......... 7-0
Warm-up Period ............................................................................. 7-i
Front Panel Calibration ....................................................................... 7-7
IEEE-488 Bus Calibration ..................................................................... 7-X
Input Amplifier Frequency Compensation Adjustment ......................................... 7-10
SPECIAL HANDLING OR STATIC-SENSITIVE DEVICES ........................................ 7-12
DISASSEMBLY ............................................................................... 7-13
Top and Bottom Cover Removal .............................................................. 7-13
Circuit Board Removal and Replacement ................................................... .. 7-15
Case Disassembly .......................................................................... 7-20
Rear Panel Disassembly ..................................................................... 7-20
Front Panel Disassembly .................................................................... 7-20
TROUBLESHOOTING ........................................................................ 7.25
Recommended Test Equipment .............................................................. 7-2.5
SelfTest ................................................................................... 7-25
Troubleshooting Sequence. .................................................................. 7-27
Power Supply Checks ....................................................................... 7-27
Microcomputer ............................................................................. 7.27
Display Board.. ............................................................................ 7-27
l/O Board .................................................................................. 7-27
Analog Circuitry Checks .................................................................... 7~33
A/D Converter Checks ...................................................................... 7~3.1
A/D Board Digital Circuitry Checks .......................................................... 7-33
FAN FILTER CLEANING/REPLACEMENT ...................................................... 7-38
Z OUTPUT HIGH LEVEL MODIFICATION ................................................. .. 7-38
CIRCUITBOARDJUMPERLOCATIONS ....................................................... 7-38
SECTION 8--REPLACEABLE PARTS
8.1
INTRODUCTION .,,....,...........,...........,,,........................
8.2 ELECTRICAL PARTS LIST ,..........,,,.......,...,.........,,........,....
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