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General Radio Company 1644-A Other
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Model:
1644-A
Date:
1964
Category:
Group:
Description:
MEGOHM BRIDGE
Information
PURPOSE.
The Type 1644-A Megohm Bridge (Figure 1-1) measures
resistance from 10* to 10l* ohms. It is useful for
measurements of resistors, of insulation resistance on
components and machinery, for resistivity tests on samples
of insulating material, and for leakage-resistance
measurements on capacitors. The vernier (AR%) dial permits
accurate measurements of voltage and temperature coefficient
of resistance. The voltage applied to the unknown may be set
from 10 volts to 1000 volts.
Manual Type:
Service and User Manual
Pages:
42
Size:
8.21 Mbytes (8608417 Bytes)
Language:
english
Revision:
Manual-ID:
1644-0100-A
Date:
1964 07 01
Quality:
Scanned document, all readable.
Upload date:
2016 12 30
MD5:
900d46b3a38abe2f9b3c9a672c05e62d
Downloads:
436
Information
Section 1.
INTRODUCTION ... 1
1.1
Purpose ... 1
1.2 Controls and
Connectors ... 1
1.3
Symbols ... 1
Section 2. OPERATING
PROCEDURE ... 3
2.1
Installation ... 3
2.2 Basic Measurement
Procedure ... 4
2.3
Accuracy ... 5
2.4
Sensitivity ... 5
Section 3.
APPLICATIONS ... 6
3.1 Resistor
Measurement ... 6
3.2 Insulation
Testing ... 6
3.3 Leakage Resistance of
Capacitors ... 7
3.4 Guarded (Direct) Three-Terminal
Measurements ... 9
3.5 Remote
Measurements ... 9
3.6 Substitution
Measurements ... 9
3.7 Measurement of Voltage
Coefficient ... 11
3.8 Measurement of Temperature
Coefficient ... 11
3.9 External Adjustment of the Internal Test
Voltage ... 12
3.10 External Test-Voltage
Supply ... 12
3.11 Measurements on Very High-Valued
Resistors ... 13
3.12 Measurements Under Adverse
Conditions ... 13
3.13 Production Limit
Testing ... 14
3.14 Battery
Operation ... 15
Section 4. THEORY OF
OPERATION ... 16
4.1
Bridge ... 16
4.2
Detector ... 17
4.3 Test-Voltage
Supply ... 17
Section 5. SERVICE AND
MAINTENANCE ... IS
5.1
Warranty ... 18
5.2
Service ... 18
5.3 Removal from
Cabinet ... 18
5.4 Bridge
Calibration ... 18
5.5 Test-Voltage
Adjustments ... 19
5.6 Detector
Adjustments ... 20
5.7
Trouble-Shooting ... 21