HP 740B Operating And Service Manual page 5

Model 740B Table of Contents
TABLE OF CONTENTS
Section
Page Section IV (Cont'd) Page
I GENERAL INFORMATION. 1-1 4-115.
Power Supplies.
4-10
1-1.
Introduction . 1-1 4-127. Chopper Neon Drivers 4-11
1-3. Description . 1-1
1-5. DC Standard . 1-1 Section Page
1-7. Differential Voltmeter. 1-2
V
MAINTENANCE. 5-1
1-9. High Impedance Voltmeter 1-2 5-1. Introduction 5-1
1-11. Amplifier 1-2 5-3. Required Test Equipment 5-1
1-14. Internal Adjustment .
1-2
5-5. Performance Tests 5-1
1-16. Specifications. 1-2 5-12. DC Standard Performance Test 5-2
1-18. Instrument Identification 1-2 5-25. Differential Voltmeter and High
1-20. Accessory Equipment Supplied.
1-2
1m
pedance Voltmeter Perfor-
1-22. Accessory EqUipment Available 1-2 mance Tests 5-6
5-34. Adjustment and Calibration . 5-10
Section
Page 5-36. Meter Mechanical Zero
II INSTALLATION 2-1
Adjustment
5-10
2 -1. Introduction. 2-1 5-38. Meter Chopper Frequency
2-3. Initial Inspection 2-1 Adjustment (A8R3) 5-10
2-5. Power Requirements
2-1
5-41. Main Loop Chopper Frequency
2-7. Grounding Requirements 2-1 Adjustment (A8R20). 5-12
2-10. Installation 2-1 5-44. Internal Zero Adjustment
2-12. Bench Mounting
2-1
(A4R13) . 5-12
2-14. Rack Mounting .
2-1
5-46. Balance Adjustment (A4R6). 5-12
2-16. Repackaging for Shipment 2-1
5-48. Meter Loop Adjustments. 5-12
5-53. Standard Vernier Adjustment
Section Page (A10R11). 5-13
III OPERATING INSTRUCTIONS 3-1 5-55. Maximum Current Limit
3-1. Introduction . 3-1 Adjustment (A10R8) . 5-13
3 -3. Accuracy Specifications 3-1 5-57. Internal Alignment Procedure 5-13
3-7.
Operating Precautions 3-1 5-63.
Voltage Set Drift Correction. 5-15
3-9-. Controls, Indicators and 5-69. Troubleshooting Procedure 5-17
Connectors 3-1 5-72. Troubleshooting Trees. 5-17
3-11. DC Standard 3-5 5-76. Loop Gain Check . 5-28
3-12. Description 3-5 5-78. Meter Loop Chopper Check. 5-28
3-14. Operating Precautions. 3-5 5-80. Main Loop Chopper Check . 5-28
3-16. Sensing. 3-6 5-82. Repair Procedures 5-29
3-24. Guarding.
3-7
5-84. Replacement of Factory Selected
3-26. Negative Outputs.
3-7
Components. 5-29
3-31. Using the Zero Control 3-7 5-104. Servicing Etched Circuit Boards 5-30
3-38. Using the Current Limit Control
3-7
5-106. Servicing Rotary Switches 5-30
3-41. Differential Voltmeter 3-8 5-109. Main Loop Feedback Divider
3-42. Description 3-8 Replacement (A9R4through
3-45. Operating Procedure. 3-8 A9R9) 5-31
3-47. Zeroing External Offset Voltages
3-9
3-49. Guarding.
· 3-10
Section Page
3-55. Voltmeter.
· 3-12
3-56. Description
· 3-12
VI REPLACEABLE PARTS 6-1
6-1. Introduction
6-1
3-58. Operating Procedure
· 3-12
6-4.
Ordering Information 6-1
3-60. Amplifier.
· 3-13
3-62. Power Amplifier.
· 3-13
6-6.
Non-Listed Parts 6-1
3-67. Voltage Amplifier
· 3-13
4-83.
4-99.
Section
IV THEORY OF OPERATION
4-1. Modes of Operation.
4 -3. Standard . . . . .
4-12. Differential Voltmeter.
4-22. Voltmeter .
4-24. Circuit Description .
4-25. Input Circuits .
4-34. Main Loop Voltage Feedback
Amplifier . . .
Reference Loop
Meter Loop . .
01794-.1
Page
4-1
4-1
4-1
4-2
4-3
4-3
4-3
4-4
4-8
4-9
Section Page
VII CIRCUIT DIAGRAMS 7 -1/7-2
7 -1. Introduction. 7 -1/7-2
7-3. Block Diagrams 7-1/7-2
7-5. Functional Diagram. 7-1/7-2
7-7. Schematic Diagrams 7-1/7-2
7 -9. Component Location Diagrams 7 -1/7-2
Appendix
A CODE LIST OF MANUFACTURERS
B SALES AND SERVICE OFFICES
C BUILDING A DC CALIBRATION SYSTEM
iii