Table Of Contents - HP 412A Operating And Service Manual

0
Model 4 12A
h
TABLE OF CONTENTS
Section Page
I GENERAL INFORMATION
.................
1-1
1. 1
.
Introduction
.........................
1-1
1. 7
.
Specifications
........................
I
-I
1. Y
.
instrument and Manual Identification
.....
1-1
.
Section
I
.
?
Page
11 INSTALLATlON
..........................
2-1
2. 1
.
Introduction
.........................
2-1
2. 3
.
Initial inspection
.....................
2-1
2. 5
.
Power Requirements
...................
2-1
2. 7
.
Grounding Requirements
...............
2-1
2.10
.
lnstallatiori
..........................
2-1
2.13
.
Repackaging for Shipment
..............
2-1
i
i
1
Section Page
I11 OPERATING INSTRUCTIONS
...............
3-1
3. 1
.
Introduction
.........................
3-1
3 . 3
.
Low-Level Electrical Phenomena
.........
3-1
3. 7
.
Turn& Procedure
....................
3-1
3-8
.
Voltage Measurement
..................
3-1
3 . 9
.
Current Measurement
..................
3-1
3-1 0
.
Resistance Measurement
................
3-2
3-1 2
.
Amplifier Operation
...................
3-3
Y
Section Page
Table of Contents
List of Tables
Section page
5.1
.
lntroduction
.........................
5-1
5 . 3
.
Required Test Equipment
...............
5-1
5.5
.
Performance Checks
...................
5-1
5. 7
.
Meter Zero
.........................
5-1
5.10
.
Voltmeter Accuracy Check
.............
5-1
5-1 1
.
Milliammeter Accuracy Clieck
..........
5-1
5-1 2
.
Ohmmeter Accuracy Check
............
5-2
5.13
.
Input Kcsistance Clieck
...............
5-3
5.14
.
AC Kejection Check
..................
5 3
5.15
.
Adjustment and Calibration Proccdure
......
5 3
5.17
.
Cabinet Removal
....................
5 3
5.18
.
Mechanical Adjustment of Meter Zero
....
5-3
5.20
.
Hum Balance Adjustment
..............
5-5
5.21
.
Cathode Follower Bias Adjustrncnt
......
5-5
5.22
.
Meter Electrical Zero Adjustment
........
5-5
5.23
.
5.24
.
V
MAINTENANCE
..........................
5-1
Amplifier Gain Adjustment and
Meter Calibration
...................
5-5
Olimmeter Adjustment
................
5-5
5.25
.
Troubleshooting
......................
5 4
5.27
.
Front Panel Indications
...............
5 4
5.29
.
Power Supply and Amplifier Checks
......
5 6
5.33
.
Modulator Clieck
....................
5 4
5.34
.
Modulator Replacement
...............
5-7
5.36
.
Demodulator Check
..................
5-7
5.37
.
Demodulator Replacement
.............
54
5.39
.
Switch Checks
......................
5-8
5 4 1
.
Adjustment of Factory Selcctcd
Components
.......................
5 4
546
.
Input Cable Keplacemcnt
..............
5-0
Section P a p
VI
REPLACEABLEPARTS
....................
6-1
IV THEORY OF OPERATION
..................
4-1
6.1
.
lntroduction
.........................
6-1
4.1
.
General
.............................
4-1 6 4
.
Ordering Information
..................
6-1
4 . 3
.
Block Diagram Analysis
................
4-1 6.6. Non-Listed Parts
......................
6-1
Section l'ilgc
4.9
.
Modulator. Amplifier. Demodulator. VI1 CIRCUITDIAGRAMS
......................
7-1
...........
4.5. Range and Function Selection 4-1
4.7
.
Filters
..............................
4-1
and Chopper
........................
4-1
7. 1
.
Introduction
.........................
7-1
4-1 1
.
Cathode Follower and Polarity Selection
...
4-1
LIST OF TABLES
Page Number Pagc
Number
1. 1
.
Specifications
.............................
1.0
3. 1
.
Voltage and Current in Resistance
Measurements
............................
3-2
5.1
.
Test Equipment Required
....................
5 4
5.2
.
Millianimeter Accuracy Check
................
5-2
5. 3
.
Input Resistance Chccks
.....................
5-3
5.5
.
Tubc Replacement
.........................
541
6-1
.
Rcplaccablc Parts
..........................
6-2
5 4
.
Power Supply Voltages
.....................
: 5 4
~
. .
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