Table of Contents Model
3438A
TABLE OF CONTENTS (Cont'dl
Section Page
VII
.
MANUAL CHANGES
..................
7-1
7.1
.
Introduction
.....................
7-1
Section Page
VIII
.
SERVICE
..........................
8-1
8-1 Introduction
.....................
8-1
8.4
.
Block Diagram and
Simplified Theory
...............
8-1
8.16
.
Detailed Theory
..................
8-1
Section Page
VIlI
.
SERVICE (Cont'd)
...................
8-1
.
...................
8.17 Powersupply 8-1
.
..................
8.25 Analog Theory 8-2
TROUBLESHOOTING
.........
.
8-5 1 Preliminary Troubleshooting 8-7
8.56
.
General Troubleshooting
...................
Information 8-8
.........
.
8.61 A1 and A2 Troubleshooting 8-9
.........
.
8.67 HP-IB (A3) Troubleshooting 8-9
LlST OF TABLES
Table Page
1.1
.
Specifications
........................
1-2
1.2
.
General Information
...................
1-4
1.3
.
Options
............................
1-4
14
.
Accessories
..........................
1-4
3.1
.
Improper Switch Combinations
............
3-1
3.2.
.
Output Delays
.......................
3-6
4.1
.
Test Equipment Required
................
4-0
4.2
.
DC Voltmeter Accuracy Test
..............
4-1
4.3
.
AC Voltmeter Accuracy Test
..............
4-2
44
.
DC Ammeter Accuracy
..................
4-3
4.5
.
AC Amnieter Accuracy Test
(200
pA Thru 20 mA Ranges)
...........
4-3
4.6
.
AC Ammeter Accuracy Test
(200
mA and 200 11iA Ranges)
...........
4-4
Table Page
................ .
4.7 Ohmmeter Accuracy Test 4-4
................
.
5.1 Test Equipment Required 5-0
.
.............
5.2 Power Supply Voltage Checks 5-2
.
.................
6.1 Standard Abbreviations 6-1
6.2
.
Code List of Manufacturers
...............
6-2
.
.....................
6.3 Replaceable Parts 6-3
.................... .
64 Miscellaneous Parts 6.10
8.1
.
Function Code
.......................
8-2
8.2
.
Range Codes
.........................
8-2
.
.........
8.3 General Interface Management Lines 8-7
...........................
.
8.4 AC Gain 8-7
.
...........................
8.5 DC Gain 8-7
.
........................
8.6 Test Jumpers 8-8
8.7
.
Test Pads
...........................
8-9
LlST OF ILLUSTRATIONS
Figure Page Figure Page
2.1
.
Hewlett-Packard Interface 4.6
.
Ohms Accuracy Test
...................
4-5
.
...........
Bus Connector
.....................
2-2 4.7 AC Normal-Mode Rejection Test 4-5
..........
.
2.2
.
Power Receptacles
.....................
2-2 4.8 AC Common-Mode Rejection Test 4-6
...................
.
3.1
.
Overload Indication
....................
3-1 5.1 DC Gain Adjustment 5-2
................... .
.................
3.2
.
Multilneter Autoranging 3-1 5.2 AC Gain Adjustment 5-3
..............
.
..........
3.3
.
Front and Rear Panel Descriptions 3-2 5.3 Line Voltage Configurations 54
.................
.
................
3.4
.
DC Voltage Measurements 3-3 5.4 Adjustment Locator .5.5/ 5.6
................
.
................
3.5
.
AC Volta~e Measurement
3-3 8.1 Simplified Block Diagrarn 8-0
3.6
.
DC Current Measurements
................
3-4 8.2
.
-7 V Regulator
.......................
8-2
3.7
.
AC Current Measurements
................
3-4 8.3
.
Range Code Logic Interface
...............
8-2
3.8
.
Resistance Measurements
................
3-5 8.4
.
DC Gain Coniiguration
..................
8-3
.................. .
3.9
.
Data Output Format and 8.5 AC Gain Configuration 8-4
Function Codes
....................
3-5
8.6
.
Ohms Block Diagram
...................
8-4
3.10
.
Talk Only Switch Settings
................
3-6
8.7
.
Ohin Gain
..........................
8-5
3-1 1
.
Talk Only Data Logger
..................
3-6
8.8
.
Integrator Output
.....................
8-6
3-1 2
.
Address Select Code
....................
3-7 8.9
.
Interface Connections and
3-1 3
.
98 15AIHP-IB Application
................
3-8
Bus Structure
......................
8-6
3.14
.
9875/HP-IB Application
.................
3.10
8.10
.
Power Supply Jumpers
..................
8-9
3-1 5
.
9830A/HP-IB Applications
..............
3-1
2
8.1
1
.
HP-IB Troubleshooting Flowchart
.........
.8-11
3.16
.
Option Decal
........................
3-7
8.12
.
Simplified
Analog Schematic
..........
8-1 518-I 6
4.1
.
DC Voltmeter Accuracy Test
..............
4-2
8.13. 3438A Input Switching, Input Amplifier,
4.2
.
AC Voltage Accuracy Test
...............
4-3
and
Ohms Current Source Schematic
.
.
8-17/8-18
4.3
.
DC Ammeter Accuracy Test
..............
4-4
8.14
.
3438A Post Amplifier, AC to DC Converter
.............
4.4
.
AC Ammeter Accuracy Test and Analog to Digital 8-1 9/8-20
(200 pA Thru
20
mA Range)
............
4-4
8.15
.
3438A HP-IB Schematic
.............
8-21/8-22
4.5
.
AC Ammeter Accuracy Test
8.16
.
3438A Display Sche~natic
............
8-2318-24
(200 111A and 2000 mA Ranges)
..........
4-4
8.17
.
Power Supply Schematic
.............
8-2518-26
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