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HP 412A User Manual
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OPERATING
AND
SERVICE
MANUAL
(HP
PART
NO.
00412-90003)
MODEL
412A/AR
DC
VACUUM
TUSE
VOLTMETER
SERIALS
PREFIXED:
301-,
3160,
424-,
649-
Copyright
Hewlett-Packard
Company
1961
P.
0.
Box
301,
Loveland,
Colorado,
80537
U.
S.A.
1
i
OOT29-5
Printod:
NOV
1968
I
1
3
Table of Contents
Table of Contents
3
General Information
6
Introduction
6
Instrument and Manual Identification
6
Introduction
7
Initial Inspection
7
Power Requirements
7
Repackaging for Shipment
7
Introduction
8
Low-Level Electrical Phenomena
8
Voltage Measurement
8
Current Measurement
8
Resistance Measurement
9
Amplifier Operation
10
General
11
Range and Function Selection
11
Filters
11
Modulator. Amplifier. Demodulator
11
Power
12
Maintenance
13
Required Test Equipment
13
Performance Checks
13
Voltmeter Accuracy Check
13
Ohmmeter Accuracy Check
14
Input Resistance Check
14
Adjustment and Calibration Proccdure
15
Cabinet Removal
15
Mechanical Adjustment of Meter Zero
15
Location of Adjustments
16
Hum Balance Adjustment
17
Cathode Follower Bias Adjustrncnt
17
Meter Electrical Zero Adjustment
17
Amplifier Gain Adjustment and Meter Calibration
17
Troubleshooting
18
Front Panel Indications
18
Power Supply and Amplifier Checks
18
Modulator Clieck
18
Modulator Replacement
19
Demodulator Check
19
Demodulator Replacement
20
Switch Checks
20
Components
20
Demodulator Assembly
20
Cabinet Model
20
Rack Model
20
Simplified Schematic, Voltmeter
21
Simplified Schematic, Ammeter
22
Meter Zero
24
AC Rejection Check
25
Replaceableparts
26
Non-Listed Parts
26
Mechanical Parts
30
Location
31
Location of
34
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HP 412A Specifications
General
Brand
HP
Model
412A
Category
Measuring Instruments
Language
English
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