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Manuals
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Amalgamated Wireless Manuals
Measuring Instruments
F242A
Manual
Amalgamated Wireless F242A Manual
Distortion and noise meter
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Contents
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Table of Contents
Table of Contents
Part 1 General Information
Introduction
Brief Description
Environmental
Distortion Factor Measurement
Level or Noise Measurement
Input Impedance
Frequency Response
Standard Filters
Mechanical Details
Accessories Provided
Optional Accessories
Ordering Information
General
Mounting
Rack Mounting
Power
Input
Alternative Input Connectors
Output
Optional Program Weighting Network
Optional Telephone Weighting Network
Repacking for Shipment
Revision 2
Part 3 Operation
Power Switch
Bal-Unbal Switch
6000 - Bridging Switch
Filters Switch
Function Switch
Distortion Calibrate Controls
Meter Range Switch
Freq. out of Range Light
Level or Noise Measurements
Absolute Level or Noise Measurements
Relative Level or Noise Measurements
Distortion Factor Measurement
Part 4 Technical Description
CIRCUIT DESCRIPTION Excluding Auto Notch Filter
Input Circuit
Program Filter
20 Khz Hi-Cut Filter
400 Hz Lo-Cut Filter
RMS-DC Converter
SET REF Attenuators and Amplifier
Power Supply
Circuit Description of Auto Notch Filter
Bridge Circuit
Bridge Preamplifier
Modified Wien Bridge Circuit
Bridge Postamplifier
Nulling Circuits
Frequency Locked Loop in Phase and Quadrature Generator
Chopper Preamplifier
Chopper & Loop Integrators
Automated Range Control
Principle of Operation
Coarse Frequency Measurement
Part 5 Maintenance
General
Service
Fault Finding, Repair and Adjustment after Repair
Calibration and Test Procedure
Test Equipment Required
Adjustment and Testing
Level Meter Testing
Provisional Level Alignment
Frequency Response and A.C. Monitor
Attenuator Test at 1 Khz
High Level Attenuator Test for REL. LEVEL, UNBALANCED
High Level Attenuator Test for REL. LEVEL, BALANCED
COARSE SET REF Attenuator Test
FINE SET REF Attenuator Test
Attenuator Test at 100Khz
Noise
Longitudinal Suppression Test
Return Loss
Lo-Cut Filter
Hi-Cut Filter
Test of Program Weighting Network
Test of Telephone Weighting Network
Level Calibration
Nulling Loop Testing
Bridge Balance Adjustment 6/9 J
Auto Ranging Circuit Adjustment
Bridge Range Test
Frequency out of Range Test
Residual Distortion Test
Part 7 Component Schedule
Components Mounted on Printed Circuit Board 2R70543
Capacitors
Resistors
Variable Resistors
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DISTORTION AND NOISE METER
F242A
Applies to Serial No. 586 Onwards
AMALGAMATED WIRELESS (AUSTRALASIA) LIMITED
North Ryde Division
422 Lane Cove Road, NORTH RYDE.
N.S.W. 2113
AUSTRALIA
Handbook 1-70542R
Issue 3 31 Jan 80
j
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