HP 740B Manuals

Manuals and User Guides for HP 740B. We have 1 HP 740B manual available for free PDF download: Operating And Service Manual

HP 740B Operating And Service Manual (113 pages)

DC STANDARD/DIFFERENTIAL VOLTMETER

Brand: HP | Category: Measuring Instruments | Size: 3 MB

Warranty and Assistance
3
Table of Contents
5
Description
5
List of Tables
6
DC Standard
7
Model 740B DC Standard/Differential
7
High Impedance Voltmeter
8
General Information
8
Amplifier
8
Internal Adjustment . 1-2
9
Specifications
9
Instrument Identification
9
Accessory Equipment Supplied
9
Accessory Equipment Available
9
Installation
10
Bench Mounting
10
Rack Mounting . 2-1
10
Repackaging for Shipment
10
Output Voltage Accuracy, STD Mode
11
Operating Instructions
12
Accuracy Specifications
12
Operating Precautions
12
Controls, Indicators and Connectors
12
Front and Rear Panel Controls, Indi
13
DC Standard
16
Description
16
Output Terminal Connections
16
Sensing
17
Local Sensing
17
Remote Sensing
17
Guarding. 3-7
18
Negative Outputs
18
Earth Ground
18
Using the Zero Control
18
ZERO Control Range
18
Using the Current Limit Control
18
Differential Voltmeter
19
Description
19
Operating Procedure
19
Maximum Output Current Characteristics
19
Type of Measurement
20
Input Terminal Connections
20
Zeroing External Offset Voltages
20
Measurement Error Caused by AC Ground Currents
21
Measurement Error Caused by DC Ground Currents
21
Guarding against AC Ground Currents
22
Guarding against DC Ground Currents
22
VM Mode RANGE and SENSITIVITY Settings
23
Input Terminal Connections
23
Voltmeter
24
Operating Procedure
24
Amplifier
24
Power Amplifier
24
Voltage Amplifier
24
Power Amplifier Output Voltage
24
RECORDER OUTPUT Voltage Gain
24
Standard
25
Theory of Operation
26
Modes of Operation
26
Circuit Description
28
Input Circuits
28
Amplifier
28
Low Voltage Section
29
High Voltage Section
30
Reference Loop
33
Meter Loop
34
Power Supplies
35
Chopperneondrivers
36
Equipment Type
37
Recommended Model
37
Required Test Equipment
38
Performance Tests
38
Maintenance
38
DC Standard Performance Test
39
DC Standard Accuracy Test
39
Current Limit Test
41
Load Regulation and Output Resistance Test
41
Radio Frequency Interference (Rfi)
42
RFI Test
42
Differential Voltmeter and High
43
Mance Tests
43
Input Resistance Test
43
Output Noise and Hum Test Data
43
Superimposed AC Rejection Test
44
AC Common Mode Rejection Test
44
Adjustment and Calibration
47
Meter Mechanical Zero Adjustment
47
Meter Chopper Frequency Adjustment (A8R3)
47
Alternate Method
47
Meter Loop Chopper Waveshape
47
Internal Adjustments and Test Points
48
Main Loop Chopper Frequency Adjustment (A8R20)
49
Internal Zero Adjustment (A4R13)
49
Balance Adjustment (A4R6)
49
Meter Loop Adjustments
49
Standard Vernier Adjustment
50
Maximum Current Limit Adjustment (A10R8)
50
Internal Alignment Procedure
50
Reference Supply Calibration
51
Voltage Set Drift Correction
52
Changing the Padding Resistance with
52
Changing the Padding Resistors
52
Front Panel Troubleshooting Tree
53
Troubleshooting Procedure
54
Troubleshooting Trees
54
Front Panel Troubleshooting
54
Main Loop Troubleshooting Tree
56
Main Loop Troubleshooting
57
Meter Loop Troubleshooting Tree
60
Meter Loop Troubleshooting
61
Reference Loop Troubleshooting
63
Loop Gain Check
64
Meter Loop Chopper Check
64
Main Loop Chopper Check
64
Repair Procedures
65
Replacement of Factory Selected Components
65
Servicing Etched Circuit Boards
66
Servicing Rotary Switches
66
Main Loop Feedback Divider Replacement (A9R4Through A9R9)
67
Test Limits
69
Introduction
71
Ordering Information
71
Non-Listed Parts
71
Replaceable Parts
71
Mechanical Parts
72
1000
73
Mechanical Parts
73
Chassis Mounted Components
83
Circuit Diagrams
87
Component Location Diagram
87
Meter Block Diagram
88
Functional and Component Location
90
Diagram
91
Input and Output Cable Assemblies
94
Schematic Diagram
94
Meter Amplifier (P/O A2) Schematic
96
And Component Location Diagram
97
Low Level Amplifier (A3) Schematic and Component Location Diagram
97
Operational Filter and Differential
98
Amplifier (A4) Schematic and Com
98
Ponent Location Diagram
98
Pulse Width Converter, 20 Khz Clock
99
Power Switch Driver, Internal
101
Supply (a 7) Schematic and Com
101
Schematic and Component Location
103
Diagram
103
Oven Heater and 1 V Reference
103
Ponent Location Diagram
104
Voltage Set and Sensitivity Switching
104

HP Categories

Desktop

Laptop Server

Monitor

Switch

More HP Manuals

HP 740B Manuals

HP 740B Operating And Service Manual (113 pages)

Table of Contents

Related Products

HP Categories