AT&T Bell System 906A Manuals

Manuals and User Guides for AT&T Bell System 906A. We have 1 AT&T Bell System 906A manual available for free PDF download: Alignment Instructions

AT&T Bell System 906A Alignment Instructions

AT&T Bell System 906A Alignment Instructions (42 pages)

DATA DISTORTION TEST EQUIPMENT

Brand: AT&T | Category: Test Equipment | Size: 2 MB

Table of Contents

Table of Contents
1
General
2
Purpose
2
Apparatus
2
Over-All or Sectionalizing Tests
2
Distortion Calibrator Circuit
2
Signal Generator and Distortion Measuring Circuit
3
F1/F2 Demodulator
3
Channel Selector
3
Bridging Amplifier and Channel Selecting Circuitry
3
Channel Demodulator
8
Circuit for Measurement of Distortion
9
On 4-Wire Wide-Band
9
Supervisory-Demodulator
11
Supervisory
11
Distortion Check
11
Trouble Location Tests
11
F1/F2 Modulator
11
Demodulator
12
Channel Selector
13
Bridging Amplifier and Channel Selecting Circuit
13
Gain Adjustment
13
Channel Demodulator
15
Data Distortion (Narrow-Band)
16
Carrier Supply
16
Supervisory-Demodulator-Demultiplexer
16
Demultiplexer Sync Recovery
18
Test of Sync Loss Indicator
21
Signal Generator
21
Circuit Package 1-Oscillator
21
Circuit Package 2-Oscillator
21
Circuit Package 2-Clock
21
Circuit Package 3-6-Stage Counter Outputs
22
Circuit Package 4-Output
22
Circuit Package 5-Stop-Start
23
Circuit Packages 6 and 7-Quasi-Random Bit Sequence
23
Distortion Measuring Circuit
24
Measuring Frequency with
24
Description of Tests
25

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