Table of Contents
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Model 654A
Table of Contents
TABLE OF CONTENTS
Section
Page
Section
Page
I.
GENERAL INFORMATION ....
.
.
.
...
..
.
1-1
5-36.
Hum and Noise Check ..
...
..
...
...
5-10
1-1.
Description......
...
....
.
.....
.
1-1
5-37
.
Counter Output Check
..
.
.
..
.
.....5-11
1-7 .
Supplied Accessories . . .
. . .
.
. .
.
.
. ..
1-1
5-38.
Adjustment Procedure
...
..
.
.....
.
.
5-12
1-8
.
Recommended Accessories.
.
. .
.
.
.
.
.
. I-I
540.
Calibration Procedure ...
..
..
.
.
....
. 5 -12
1-9.
Instrument
and
Manual Identification ... I-I
542.
Turn-On ..
.
. . . . . . . . . . . . .
.
... .5-13
545.
Power Supply Voltage Adjustments ... 5-13
Section
Page
546
.
Power Supply Regulation and
11.
INSTALLATION
5-13
Zero Adjustment.
........
..
..
..
3-1
5-88
.
Trouble Isolation in the Remainder
Section
Page
5-95.
Troubleshooting the Meter
.....
..
....
..
.....
.
.
. 2-1
Ripple Check ..
.
...
.
..
..
....
.
.
2-1.
Introduction
5-13
...
.
......
.
......... 2-1
547
.
Frequency
Calibration
Procedures
..
..
2-3.
Initial Inspection
. . . . . . . . . . . . . .
.
..
2-1
5-58
.
Meter Tracking and Amplitude
2-5.
Power Requirements ...
.
..........
2-1
Control Adjustments
.
...
..
..
...
.5-16
2-9
.
Ground ing Requirements .
.
....
.
.
.
..
2-1
5-61.
Amplitude Accuracy Calibration .
..
..5-17
2-11.
Installation
5-18
...
...
...
...
....
..
.
..
2-1
5-62.
Balance Adjustments .......
.
.....
2-13.
Rack/Bench Installation .
....
...
..
..
2-1
5-65
.
Level Flatness Adjustments
.
... .....5-18
1-15.
Repackaging for Shipment. .
.
.
.
.
.
..
2-1
5-70.
Troubleshooting the 654A ..
......
.. 5-19
5-74.
Front Panel Checks
.
......
.
......5-19
Section
Page
5-75.
Troubleshooting Tree
..
.
.......
.
. 5-19
Ill.
OPERATING INSTRUCTIONS.
.
.
.
. .
.
.
.
.
3-1
5-78
.
Troubleshooting the Power Supply
....
5-22
3-1.
Introduction
5 -22
. . . . . . . . . . . . . . . . . . . .
3-1
5-81.
Troubleshooting the Oscillator Circuit .
3-3
.
Controls,
Indicators, and Connectors
5-23
....
3-1
5-84.
Troubleshooting the Buffer Amplifier ..
3-5.
Turn-On Proced ure
.
.
. .
.
. .
. .
.
.
.
.
.
.
3-
I
5-86.
Troubleshooting
the
Balanced
3-6.
Output Meter Mechanical
Amplifier. ..
.......
.......
...
5-23
3-8.
Primary Power Application
..
...
.
... 3-1
of the Leveling Loop ...
.
..
.
.. ...5-23
3-9.
Operating Instructions
....
.
.....
... 3-1
5-91.
Troubleshooting
the
Amplitude
3·
10.
Operating
Check
..
..
......
.
...... 3-1
Control
Integrator
..
...
......
...5-24
5-93.
Troubleshooting the A LC Loop ..
...
. 5
-24
IV.
THEORY
OF OPERATION
5-24
......
.
.......
4-1
Differential Amplifier ..
.
.....
..
.
4-1.
General
Description . . . . . . . . . . . .
..
. 4-1
5-97.
Troubleshooting the Attenuators .....5-24
4-6
.
Circuit Description .
.
.
.
...
.
.
..
.
.
.
.
4-1
5-99.
Servicing Etched Circuit Boards ..
.
. ..5-24
4-7.
Oscillator Circuit.
.
.
.
.
.
.
.
. . .
4-1
5-101.
Servicing Rotary Switches
.
.....
..
.5-25
4-11
.
Buffer Amplifier ...
..
. . . . . . . . . . .
4-2
5-103
.
Servicing Tuner Assembly .
.
..
.
.....5-25
4-13.
Counter Emitter Follower ..
.
......
4-2
4·15
.
Balanced Amplifier
. . . . . . . . . . . . . .
4-2
Section
Page
4-19
.
Amplitude Control
and
Automati
c
VI
REPLACEABLE PARTS ....
...
...
..
.... 6-1
Leveling
Con trol
........
.
..
....
4-3
6-1.
Introduction
..
....
...
...
.
...
.
...
6-1
4-29.
Meter
Circuits
.
.
.
.
. . .
.
.
44
64.
Ordering Information ...
.
...
.
....
.. 6-1
4-33.
Attenuators
..
. .
.
. .
..
. ..
.
..
..
4-4
6-6.
Non-Listed Parts
....
..
...
.
.......
6-
1
4-35.
Impedance Se
lec
tor. .
.
.
.
.
.
.
.
44
4-37.
Regulated Power Supply
.
.
.
.
.
.
.
.
4-4
Section
Page
VII CIRCUIT DIAGRAMS ..
.
......
...
...... 7-1
7-1.
Introduction
.....
.
..
.
. . . . . . . . . . .
7-1
Section
Page
V.
MAINTENANCE
..
...
......
.....
.
..... 5-1
5-1.
Introduction
.
...
.
...
..
......
..
.. 5-1
54
.
Performance Checks.
. .
.
.
. . .
.
. . . .
5-1
5-6.
Frequen
cy
Checks..
...
..
.
.
.....
.
5-1
5-7
.
Frequency Range Check
...
....
.
.... 5-1
5-8.
Frequency Accuracy Check .
...
...
..
.
5-1
5-9.
Amplitude Accuracy Checks. .
5-1
5-15.
Level
Flatness Checks
..
.
.........
54
APPENDICES
5-21.
Meter Tracking Accuracy Check ..... 5-6
5-22.
Attenuator Accuracy Checks
........
5-7
A.
CODE LIST OF MANUFACTURERS
5-28.
Balance Checks. . .
.
...
.
.
..
.. 5-8
B.
SALES AND SERVICE OFFICES
5-35.
Distortion Clleck . . . .
.
.
.
.
. .
5-9
C.
BACKDATING
tii
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