HP 740B Operating And Service Manual page 6

List of Tables
List of Illustrations
Model 740B
LIST OF TABLES
5-3
5-6
5-9
5-9
Page
5-7.
5-8.
5-9.
5-10.
5-11.
5-12.
6-1.
6-2.
Number
5-2. DC Standard - Accuracy and Linearity
Test Data.
5-3. Output Noise and Hum Test Data
5-4. LlVM and VM Accuracy Test Data,
1 V - 1000 V
5-5. LlVM and VM Accuracy Test Data,
1 mV - 100 mV .
5-6. Changing the Padding Resistance with
Jumper Wires . 5-15
Changing the Padding Resistors. . 5-15
Preliminary Checks. . 5-16
Front Panel Troubleshooting . 5-17/5-18
Main Loop Troubleshooting . 5-21/5-22/5-23
Meter Loop Troubleshooting. 5-25
Reference Loop Troubleshooting . 5-27
Mechanical Parts 6-3
Replaceable Parts. . 6-16
3-12
3-12
3-13
3-13
4-1
4-2
4-3
5-0
Page
1-0/1-1
1-2
1-2
3-5
3-7
3-9
Number
1-1. Specifications.
1-2. Accessory Equipment Supplied.
1-3. Accessory Equipment Available
3 -1. Output Terminal Connections.
3-2. ZERO Control Range . . .
3 -3. Input Terminal Connections
3 -4. VM Mode RANGE and SENSITIVITY
Settings
3-5. Input Terminal Connections
3 -6. Power Amplifier Output Voltage
3-7. RECORDER OUTPUT Voltage Gain
as a Function of RANGE and SENSI-
TIVITY.
4-1. Main Loop Gain Characteristics
4-2. Main Loop Gain
(.~VM)
4-3. Meter Loop Gain (LlVM and VM)
5-1. Required Test Equipment.
5-4
5-5
5-6
5-7
5-7
5-8
1-0
3-0
3-0
3-10
3-11
3-11
5-2
5-4
5-26
3-10
OF ILLUSTRATIONS
Page Number Page
6-1. Mechanical Parts . . . . . . . . . . . 6-2
7 -1. DC Voltmeter and Differential Volt-
meter Block Diagram . . . . . . . 7 -3/7-4
7-2. DC Standard Block Diagram 7-5
7-3. Functional and Component Location
Diagram 7-6/7-7/7-8/7-9
7 -4. Input and Output Cable Assemblies
Schematic Diagram. . . . . . . . . . . 7 -10
7 -5. Internal Alignment Schematic and
Component Location Diagram
7 -6. Meter Amplifier (p/o A2) Schematic
and Component Location Diagram 7 -13/7-14
7 -7. Low Level Amplifier (A3) Schematic
and Component Location Diagram 7-15/7-16
7 -8. Operational Filter and Differential
Amplifier (A4) Schematic and Com-
ponent Location Diagram . . . . . 7 -17/7 -18
7 -9. Pulse Width Converter, 20 kHz Clock
and External Current Limit (A5)
Schematic and Component Location
Diagram 7-19/7-20
7-10. Guarded Power Supply (A6) Schematic
and Com ponent Location Diagram. 7 -21/7 -22
7-11. Power Switch Driver, Internal
Current Limit and Unguarded Power
Supply (A 7) Schematic and Com-
ponent Location Diagram. . . . . 7 -23/7 -24
7 -12. Chopper Neon Drivers (A8) Schematic
and Com ponent Location Diagram. 7 -2 5/7 -2 6
7 -13. Oven Heater and 1 V Reference
Supply (p/o AI, p/o A2, A13)
Schematic and Component Location
Diagram 7 -27/7 -28
7 -14. Voltage Set and Sensitivity Switching
(S2, S4 thru S8) Schematic and
Component Location Diagram . . 7 -29/7 -30
LI S T
5-4.
5-5.
5-6.
5-7.
5-8.
5-9.
3-1.
3-2.
3-3.
3-4.
3 -5.
3-6.
3-7.
3-8.
5-10.
5-11.
5-12.
5-13.
5-14.
5-15.
5-16.
5-17.
3-10.
3-11.
5-1.
5-2.
5-3.
Nwnber
1-1. Model 740B DC Standard/Differential
Voltmeter .
Output Voltage Accuracy, STD Mode.
Voltage Reading Accuracy, LlVM Mode
Front and Rear Panel Controls, Indi-
cators and Connectors. 3 -2/3 -3/3-4
Local Sensing . . . . . . . . . . . . . . 3-6
Remote Sensing. . . . . . . . . . . . . 3-6
Maximum Output Current Characteristics 3-8
Sixth Digit LlVM 3-9
Measurement Error Caused by AC
Ground Currents . . . . . . . . .
3-9. Measurement Error Caused by DC
Ground Currents . . . . . . . . .
Guarding Against AC Ground Currents.
Guarding Against DC Ground Currents.
DC Standard Accuracy Test. . . . . .
Current Limit Test. . . . . . . . . .
Load Regulation and Output Resistance
Test .
RFI Test. .
Input Resistance Test. . . . . . .
Superimposed AC Rejection Test.
AC Common Mode Rejection Test
LlVM and VM Accuracy Test, 1 V - 1000 V
LlVM and VM Accuracy Test,
1 mV - 100 mV . . . . . . . . . . . 5-10
Meter Loop Chopper Waveshape . . . 5-10
Internal Adjustments and Test Points 5-11
Main Loop Chopper Wave shape . . . . 5-12
Reference Supply Calibration. . . . . 5-14
Front Panel Troubleshooting Tree.. 5-16
Main Loop Troubleshooting Tree . 5-19/5-20
Meter Loop Troubleshooting Tree 5-24
Reference Loop Troubleshooting
Tree .
iv
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