DocumentCode :
1197120
Title :
An Audio-Frequency Four-Terminal Resistance Bridge
Author :
Souders, T. Michael
Volume :
23
Issue :
4
fYear :
1974
Firstpage :
342
Lastpage :
345
Abstract :
The design and performance of an audio-frequency four-terminal resistance bridge is described which compares resistors from 1 to 0.001 ¿ over a frequency range of 50 Hz-10 kHz. Current scaling establishes equal voltage across the resistors, permitting the standard to have the larger value and most optimum design while dissipating less power than the unknown. An amplifier-aided two-stage current transformer forms the ratio arms. Ratios of 1, 2, 4, 5, 10, and 20 are available, and a maximum applied current of 200 A is accommodated. Bridge ratio errors are less than 2 × 10-6 in both magnitude and phase at frequencies up to 1 kHz, increasing to 2 × 10-5 at 10 kHz. Simple transformer scaling techniques are described for producing accurate and stable resistance standards at the 0.001-¿ level.
Keywords :
Bridge circuits; Current transformers; Electrical resistance measurement; Frequency measurement; Impedance; Particle measurements; Phase measurement; Power measurement; Resistors; Thermal resistance;
fLanguage :
English
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9456
Type :
jour
DOI :
10.1109/TIM.1974.4314308
Filename :
4314308
Link To Document :
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