Title :
100 A AC-DC current measurements to within ±25 ppm from 3 Hz to 1 kHz
Author_Institution :
Clarke-Hess Commun. Res. Corp., New York, NY, USA
fDate :
7/1/2000 12:00:00 AM
Abstract :
The paper uses a set of computer controlled commercial equipment in conjunction with a software-controlled digitising voltmeter to produce accurate 100 A current measurements at ±DC and in the frequency range from 0.1 Hz to 1 kHz. Overall uncertainties in the region of ±20 ppm appear possible. The paper concentrates on 100 A results: however, the concepts work down to 10 A and up to at least 1 kA. The resultant system is nearly immune to the thermal problems and warm-up times that plague shunts and thermal convertors, particularly for currents greater than 20 A. A method to separate the transfer functions of the amplifier and the transducer is proposed. Experimental verification of the method and of the system performance is provided
Keywords :
computerised instrumentation; electric current measurement; measurement uncertainty; 0.1 Hz to 1 kHz; 10 A to 1 kA; 100 A; 100 A current measurement; 20 A; 3 Hz to 1 kHz; AC-DC current measurement; computer controlled commercial equipment; experimental verification; plague shunts; software-controlled digitising voltmeter; system performance; thermal convertors; thermal problems; transfer functions; uncertainties; warm-up times;
Journal_Title :
Science, Measurement and Technology, IEE Proceedings -
DOI :
10.1049/ip-smt:20000527
