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412A
HP 412A User Manual
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a
U
0
Section
VI
Model
4
12A
ITEM
DESCRIPTION
hp-
PART
NO.
I
thru
7
I
thru
6
2thru7
I
2
3
4
5
6
7
Complete
Probe
Assembly
Robe
Assembly
less
Cable
Boot
Robe
Assembly
less
law
Assembly
Jaw
and
Sleeve
Assembly
Probe
Sleeve Assembly
(includes
cable
and
R48)
Ground
Body
Locknut
440
Allen
setscrew (2
required)
Handle
Cable
Boot
0041242
101
41
2A-21
G
0041242103
5060W
I6
0041
242102
5020.0648
50404407
3030.005
1
50404405
412A83A
Figure
6-3.
VoltaRe
Probe
Assembly
6-7
001
29-5
31
33
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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