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HP Manuals
Measuring Instruments
412A
Operating and service manual
HP 412A Operating And Service Manual
Dc vacuum tube voltmeter, serials prefixed: 301-, 3160, 424-, 649-
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(4 pages)
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
General Information
Introduction
Instrument and Manual Identification
Introduction
Initial Inspection
Power Requirements
Repackaging for Shipment
Introduction
Low-Level Electrical Phenomena
Voltage Measurement
Current Measurement
Resistance Measurement
Amplifier Operation
General
Range and Function Selection
Filters
Modulator. Amplifier. Demodulator
Power
Maintenance
Required Test Equipment
Performance Checks
Voltmeter Accuracy Check
Ohmmeter Accuracy Check
Input Resistance Check
Adjustment and Calibration Proccdure
Cabinet Removal
Mechanical Adjustment of Meter Zero
Location of Adjustments
Hum Balance Adjustment
Cathode Follower Bias Adjustrncnt
Meter Electrical Zero Adjustment
Amplifier Gain Adjustment and Meter Calibration
Troubleshooting
Front Panel Indications
Power Supply and Amplifier Checks
Modulator Clieck
Modulator Replacement
Demodulator Check
Demodulator Replacement
Switch Checks
Components
Demodulator Assembly
Cabinet Model
Rack Model
Simplified Schematic, Voltmeter
Simplified Schematic, Ammeter
Meter Zero
AC Rejection Check
Replaceableparts
Non-Listed Parts
Mechanical Parts
Location
Location of
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