SECTION 6-THEORY OF OPERATION
6.1
6.2
6.3
6.3.1
6.3.2
6.3.3
6.3.4
6.3.5
6.4
6.4.1
6.4.2
6.4.3
6.5
6.6
6.6.1
6.6.2
6.6.3
6.6.4
6.6.5
6.6.6
6.7
6.6
7.1
7.2
7.3
7.3.1
7.3.2
7.4
7.4.1
7.4.2
7.4.3
7.4.4
7.4.5
7.4.6
7.4.7
7.4.8
7.4.9
7.4.10
7.4.11
7.4.12
7.4.13
7.4.14
7.4.15
7.4.16
7.5
7.6
7.7
7.7.1
7.7.2
7.7.3
7.7.4
7.7.5
7.7.6
Introduction
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Overall Functional Description
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Input Preamplifier
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Input stage ......................
Gain Stage. ......................
Output stage. ....................
Ohms Voltage Source
Zero Check ......................
Additional Signal Conditioning
.......
Ranging Amplifier ................
Multiplexer and Buffer Amplifier ....
- 2V Reference Source. ............
A/D Converter.
....................
Digital Circuitry
....................
Microcomputer. ..................
Memory Elements. ................
Device Selection ..................
IEEE-486 Bus .....................
Input/Output Circuitry ............
Display Circuitry .................
Voltage source
.....................
Power Supplies
.....................
SECTION 7-MAINTENANCE
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6-l
6-1
6-l
6-3
6-3
6-3
6-6
6-7
6-7
6-7
6-8
6-9
6-9
6-11
6-11
6-11
6-u
6-11
6-12
6-12
6-13
6-14
Introduction..
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LineVoltageSelection
........................................................................
FuseReplacement
............................................................................
Lim Fuse .................................................................................
COMFuse ................................................................................
Calibration
.................................................................................
Recommended Calibration Equipment. ........................................................
EnvironmentalConditions ..................................................................
WarmUpPeriod ..........................................................................
CalibrationJumper
.........................................................................
Front Panel Calibration .....................................................................
IEEE-488 Bus Calibration. ...................................................................
Calibration Sequence .......................................................................
InputOffsetAdjustment ....................................................................
InputCurrentAdjustment ...................................................................
Pemxnent Storage of Calibration Parameters
...................................................
AmpsCalibration.. .......................................................................
Coulombs Calibration ...................................................................
VoltsCalibration.. ........................................................................
OhmsCalibration .........................................................................
Voltage Source Calibration ..................................................................
Additional Calibration Points ................................................................
Special Handling of Static-Sensitive Devices
......................................................
Disassembly Instructions
......................................................................
Troubleshooting
.............................................................................
RecommendedTestEquipment ...............................................................
PowerUpSelfTest .........................................................................
SelfDiagnosticProgram ....................................................................
PowerSupplyChecks ......................................................................
RelayConfiguration ........................................................................
Ranging Amplifier Gain Configuration ........................................................
7-l
7-1
7-2
7-Z
7-2
7-2
7-2
7-3
7-3
7-3
7-3
7-4
7-5
7-5
7-s
7-6
7-4
7-7
7-8
7-a
7-10
7-10
7-U
7-12
7-12
7-12
7-14
7-14
7-14
7-15
7-15
iv
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