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Section

VII

VI01

VI05

(BOTTOM)

VI04

VI03

(TOP)

C116

,--

--.

DEMODULATOR

ASSEMBLY

Figure

7-1.

Location

Chassis

Mounted Parts, Cabinet Modcl

7-2

129-5

Table of Contents3
General Information6
Introduction6
Instrument and Manual Identification6
Introduction7
Initial Inspection7
Power Requirements7
Repackaging for Shipment7
Introduction8
Low-Level Electrical Phenomena8
Voltage Measurement8
Current Measurement8
Resistance Measurement9
Amplifier Operation10
General11
Range and Function Selection11
Filters11
Modulator. Amplifier. Demodulator11
Power12
Maintenance13
- Required Test Equipment13
- Performance Checks13
  - Voltmeter Accuracy Check13
- Ohmmeter Accuracy Check14
Input Resistance Check14
- Adjustment and Calibration Proccdure15
  - Cabinet Removal15
  - Mechanical Adjustment of Meter Zero15
Location of Adjustments16
- Hum Balance Adjustment17
- Cathode Follower Bias Adjustrncnt17
- Meter Electrical Zero Adjustment17
  - Amplifier Gain Adjustment and Meter Calibration17
- Troubleshooting18
- Front Panel Indications18
- Power Supply and Amplifier Checks18
  - Modulator Clieck18
- Modulator Replacement19
- Demodulator Check19
- Demodulator Replacement20
- Switch Checks20
  - Components20
Demodulator Assembly20
Cabinet Model20
Rack Model20
Simplified Schematic, Voltmeter21
Simplified Schematic, Ammeter22
- Meter Zero24
AC Rejection Check25
Replaceableparts26
- Non-Listed Parts26
Mechanical Parts30
Location31
Location of34

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HP 412A Specifications

General

Brand	HP
Model	412A
Category	Measuring Instruments
Language	English

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HP 412A Specifications

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