Table of Contents
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Model 654A
Table of Contents
TABLE OF CONTENTS
Section
Page
I
GENERAL INFORMATION
1-1
1-1.
Description
1-1
1-7.
Supplied Accessories
1-1
1-8.
Recommended Accessories
1-1
1-9.
Instrument and Manual Identification . . .
1-1
Section
Page
II
INSTALLATION
2-1
2-1.
Inspection
2-1
2-3.
Power Requirements
2-1
2-5.
Grounding Requirements
2-1
2-8.
Installation
2-1
2-10. Rack/Bench Installation
2-1
2-12. Repackaging For Shipment
2-1
Section
Page
III
OPERATING INSTRUCTIONS
3-1
3-1.
Introduction
3-1
3-3.
Controls, Indicators and Connectors
3-1
3-5.
Turn-On Procedure
3-1
3-6.
Output Meter Mechanical
Zero Adjustment
3-1
3-8.
Primary Power Application
3-1
3-9.
Operating Instructions
3-1
3-10. Operating Check
3-1
Section
Page
IV
THEORY OF OPERATION
4-1
4-1.
General Description
4-1
4-6.
Circuit Description
4-1
4-7.
Oscillator Circuit
4-1
4-11.
Buffer Amplifier
4-2
4-13.
Counter Emitter Follower
4-2
4-15.
Balanced Amplifier
4-2
4-19.
Amplitude Control and
Automatic Leveling Control
4-3
4-29.
Meter Circuits
44
4-33.
Attenuators
44
4-35.
Impedance Selector
44
4-37.
Regulated Power Supplies
44
Section
V.
MAINTENANCE
5-1.
Introduction
5-4.
Performance Checks
5-6.
Frequency Checks
5-9.
Amplitude Accuracy Checks
5-15.
Level Flatness Checks
5-21.
Meter Tracking Accuracy Check
5-22.
Attenuator Accuracy Checks
5-28.
Balance Checks
5-35.
Distortion Check
Page
5-1
5-1
5-1
5- I
5-1
5-4
5-6
5-7
5-8
5-9
Section
Page
5-36.
Hum and Noise Check
5-10
5-37.
Counter Output Check
5-11
5-38.
Adjustment Procedure
5-12
5-40.
Calibration Procedure
5-12
5-42.
Turn-On
5-13
545.
Power Supply Voltage Adjustments
5-13
5-46.
Power Supply Regulation and
Ripple Check
5-13
5-47.
Frequency Calibration Procedures .
5-13
5-52.
Frequency Dial and 1 K
Range Adjustment
5-14
5-58.
Meter Tracking and Amplitude
Control Adjustments
5-16
5-61.
Amplitude Accuracy Calibration .. 5-17
5-62.
Balance Adjustments
5-18
5-65.
Level Flatness Adjustments
5-18
5-70.
Troubleshooting the 654A
5-19
5-74.
Front Panel Checks
5-19
5-75.
Troubleshooting Tree
5-19
5-78.
Troubleshooting the Power Supply.
5-22
5-81.
Troubleshooting the Oscillator
Circuit
5-22
5-84.
Troubleshooting the Buffer
Amplifier
5-23
5-86.
Troubleshooting the Balanced
Amplifier
5-23
5-88.
Trouble Isolation in the Remainder
of the Leveling Loop
5-23
5-91.
Troubleshooting the Amplitude
Control Integrator
5-24
5-93.
Troubleshooting the ALC Loop .
5-24
5-95.
Troubleshooting the Meter
Differential Amplifier
5-24
5-97.
Troubleshooting the Attenuators
5-24
5-99.
Servicing Etched Circuit Boards
5-24
5-101.
Servicing Rotary Switches
5-25
5-103.
Servicing Tuner Assembly
5-25
Section
Page
VI
REPLACEABLE PARTS
6-1
6-1.
Introduction
6-1
64.
Ordering Information
6-1
6-6.
Non-Listed Parts
6-1
Section
Page
VII
CIRCUIT DIAGRAMS
7-1
7-1.
Introduction
7-1
APPENDICES
A.
CODE LIST OF MANUFACTURERS
B.
SALES AND SERVICE OFFICES
Ii
Î
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