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Table of
Contents
Model 34904
TABLE
0F C0NTENTS
(Gont'd)
Section
Page
IV.
THEORYOFOPERATION
.
........4-I
4-1.
Introduction
...4-l
4-3.
General Theory
of
Operation
. . .4-l
4-5.
Signal Conditioning
Circuits .
.
.
. . . .
. 4-l
4-7.
ReferenceVoltages
...4-l
4-9.
DC
Amplifier
......
.4-l
4-ll.
Analog-to-Dgital
Converter
. .
.
. .. . . 4-l
4-13.
Logrc .
......4-l
4-15.
Display
......4:2
4-17.
Range
and Function
Control
. . . -
. . . 4-2
4-19.
DC
Analog
Circuits
.. - .4-2
4:21. InputAttenuator
..
........4-z
4-23.
DC
Amplifier
. .....
.+3
4-25.
DC Amplifier
Gain .
... .....4-3
4-27.
SwitchingCircuits
....4-3
4-29.
BootstrapCircuit
....4-3
4-31.
Reference
Voltages
. .
.4-3
4-33.
OverloadProtection
........43
4-35.
Leakage
Control
.....43
4-37.
DC
Amplifier
Auto Zero
. .
. . .4-3
4-39.
Integrator
Circuits
.
.. .
.4-s
440.
Dual-Slope
Integration
.. .,..4-s
42. IntegratingAmplifier
.......4-5
4
44.
x
20 Amplifiet
-..
. . .M
446.
ZeroDelectAmplifier
......M
4-48.
ElectronicSwitch
....M
4-50.
Integrator
Auto Zero
.
.
-
...
.44
4-52.
AC
Converter
.
. .44
4-54.
AC
Attenuators
..
...44
4-56.
ConverterAmplifier
........44
4-58.
Rectifier
and Filter
.
.
.
+7
440.
OhmsConverter....
...*7
442.
CunentSource
......4-7
444.
Ohmmeter Power
Supply
.
. . .4-7
,"
4-66.
OhmmeterReference
.......+g
448.
InputProtection...
..+9.
4:70.
Dsplay
Assembly
(Figure
7-27).......44
4-71.
Display
Units .
......4-g
4-73.
ScanGenerator....
........+g
4-75.
ScanDecoder
.......4-8
4-77.
PolarityDisplay
.....4-8
4-79.
Decimals
and
Annunciators
.
.
. . . . .
. 4-B
4-81.
IngicCircuits
....
....4-8
442.
Clock.
......43
444.
DataCounter
.......+9
4-86.
Buffers
......+9
+88.
Timing
Counter
.
.. . .
+9
4-90.
Algorithmic
State Machine
. . . .
. . .
.
+ll
4-105.
Input
Polarity
Storage
..
.
.
.
4_12
4-107.
Transfer
andZero
Detect
.
.
.
4-12
4-113.
OverloadStorage
...+13
+l15.
DC
Switching
Logic .
. . +13
+117.
ReferenceSupplies
...+13
4-1
18.
Voltage
Measurements
....
.......
+13
+122.
RatioMeasurements
(Option080)
.
....+14
+118.
Front
Panel
Switching
.
... . . .4-15
ir-
Section IV
(cont'd)
page
4-130. PowerSupplies
...
...4-15
4-132.
Self-TestFunction
....4-16
4-134.
LogicTest,No.
I
.
..+16
+137.
lOVRangeZero,TestNo.
2
. .....
+17
4-139.
TurnoverError,
TestNo.
3
. .......
4-17
+141.
f
ReferenceCheck,TestNo.
4 .....
4-17
4-143.
0.1 VRangeZero,TestNo.
5
. .....
4-17
4-145.
x.0l
Atten.,
x
100
Gain,
TestNo.6....
..4-17
+147.
Ohms
Reference,TestNo.
7 .
......4-17
4-149.
BCD
Remote
Expand
Option
020
(FigureT-31)
.....4-t7
4-150.
Outguard Power
Supply
- .
.
.4-l,l
4-152.
Isolated
Trigger
and Hold
. .
.
zt-18
4-154.
Sample/HoldTriggerCircuits
.
..
.. . 4-18
4-158.
Data
Output
Option
021
..
. .
.4-18
+160.
DataMultiplexers
..
.......4-18
4-162.
DataOutputSequential
Logic .....
4-18
4-164.
Data
Clock
.
. +lg
+166. Isolation
Assembly
. .4-18
4-168.
ShiftRegisters
....
.......4-19
+170.
DataFlag
...+19
4-172.
PrinterHold.
......+19
4-174.
Remote
Control
Option 022 .
.. .
. .. .+19
4-176.
Circuitlsolation
-...+19
+178.
RemoteEnable
...-.+19
4-180.
OutguardMultiplexer
......+19
4-182.
Remote
Sequential
Logrc
.
.
-
4-19
4-184.
Program
Flag
.
...
-.+19
+186.
Data
Clock
. .4-20
4-188.
Shift
Registers
.....4-20
.
+19O.
Local/RemoteMultiplexers
. ......4-20
4-192.
Local/RemoteFlip-Flop
....+2O
4:194.
Data Flag
.
. .4-20
4-196.
General Purpose
Interface
Bus
I/O
(Option
030) .
.. ..
. . .4-20
+198.
GPIBSystem
......4-20
4-201.
Basic
Theory
of
GPIB I/O
Circuits
. . +21
4-204.
GPIB
System
Operation
. .
. .4-21
4-212.
Sample/Hold
Option 040 or
045 . . . .
.4-22
+214.
Track/Hold
Mode .
. .4-22
+216.
Acquire/HoldMode
.
......4-22
4-218.
Sample/HoldMeasurement
Sequence
..+22
4-221.
Sample/HoldAnalogCircuits
...
...4-23
4-228.
Sample/Hold
Logic
Circuits . .
. . . .
.
+25
Section
Pase
V.
MAINTENANCE
...
... . s]r
5-1. Introduction
.....5-l
5-3.
RecommendedTestEquipment.
..
...
.. .
5-l
5-5. TestRecord
.....5-l
5-7. PerformanceTests.
......5-l
5-9. DCVoltmeterAccuracyTest..
...5-l
5-l l.
AC Voltmeter
Accuracy
Tests
.
. . .
5-l
5-15.
OhmmeterAccuracyTests..
.... -5-2
5-16.
PreferredMethod
......5-2