Amalgamated Wireless F242A Manuals

Manuals and User Guides for Amalgamated Wireless F242A. We have 1 Amalgamated Wireless F242A manual available for free PDF download: Manual

Amalgamated Wireless F242A Manual

Amalgamated Wireless F242A Manual (71 pages)

DISTORTION AND NOISE METER

Brand: Amalgamated Wireless | Category: Measuring Instruments | Size: 1 MB

Table of Contents

Table of Contents
3
Part 1 General Information
8
Introduction
8
Brief Description
8
Environmental
9
Distortion Factor Measurement
9
Level or Noise Measurement
9
Input Impedance
10
Frequency Response
10
Standard Filters
10
Mechanical Details
11
Accessories Provided
11
Optional Accessories
12
Ordering Information
12
General
13
Mounting
13
Rack Mounting
13
Power
14
Input
14
Alternative Input Connectors
14
Output
14
Optional Program Weighting Network
15
Optional Telephone Weighting Network
15
Repacking for Shipment
15
Revision 2
15
Part 3 Operation
16
Power Switch
16
Bal-Unbal Switch
16
6000 - Bridging Switch
16
Filters Switch
16
Function Switch
16
Distortion Calibrate Controls
17
Meter Range Switch
17
Freq. out of Range Light
17
Level or Noise Measurements
17
Absolute Level or Noise Measurements
17
Relative Level or Noise Measurements
17
Distortion Factor Measurement
18
Part 4 Technical Description
19
CIRCUIT DESCRIPTION Excluding Auto Notch Filter
19
Input Circuit
19
Program Filter
20
20 Khz Hi-Cut Filter
20
400 Hz Lo-Cut Filter
20
RMS-DC Converter
20
SET REF Attenuators and Amplifier
20
Power Supply
20
Circuit Description of Auto Notch Filter
21
Bridge Circuit
21
Bridge Preamplifier
21
Modified Wien Bridge Circuit
21
Bridge Postamplifier
21
Nulling Circuits
21
Frequency Locked Loop in Phase and Quadrature Generator
21
Chopper Preamplifier
23
Chopper & Loop Integrators
23
Automated Range Control
23
Principle of Operation
23
Coarse Frequency Measurement
24
Part 5 Maintenance
26
General
26
Service
26
Fault Finding, Repair and Adjustment after Repair
27
Calibration and Test Procedure
30
Test Equipment Required
30
Adjustment and Testing
30
Level Meter Testing
30
Provisional Level Alignment
30
Frequency Response and A.C. Monitor
31
Attenuator Test at 1 Khz
31
High Level Attenuator Test for REL. LEVEL, UNBALANCED
32
High Level Attenuator Test for REL. LEVEL, BALANCED
32
COARSE SET REF Attenuator Test
33
FINE SET REF Attenuator Test
33
Attenuator Test at 100Khz
33
Noise
33
Longitudinal Suppression Test
34
Return Loss
35
Lo-Cut Filter
35
Hi-Cut Filter
36
Test of Program Weighting Network
36
Test of Telephone Weighting Network
36
Level Calibration
37
Nulling Loop Testing
38
Bridge Balance Adjustment 6/9 J
38
Auto Ranging Circuit Adjustment
39
Bridge Range Test
39
Frequency out of Range Test
40
Residual Distortion Test
40
Part 7 Component Schedule
41
Components Mounted on Printed Circuit Board 2R70543
41
Capacitors
41
Resistors
44
Variable Resistors
50

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