Equipment information

General Radio Company 1644-A Other
Manufacturer:
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.

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Service and User Manual
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

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