NDLI: An A-C Kelvin bridge for the audio-frequency range

Content Provider	IEEE Xplore Digital Library
Author	Dunfee, Bernadine L.
Copyright Year	2012
Abstract	THE present trend in electrical measurements indicates the need for a test method by which the ratio and phase angle of current transformers can be measured at adiuo frequencies with the same accuracy as they are now measured at power frequencies. The theoretical aspects of several test methods are being investigated at the National Bureau of Standards. It is essential to this study to determine the extent to which the present test equipment,1 comprising 4-terminal impedors and a mutual inductor in a potentiometer network, can be utilized in high-frequency measurements. As part of this program, an a-c Kelvin bridge has been developed for measuring the characteristics of the 4-terminal impedors at audio frequencies. At present the bridge method permits resistance and phase-angle measurements up to 6,000 cycles per second (cps). A substitution technique is employed in which the bridge is balanced first with the unknown and then with a primary standard having a computable skin effect and phase angle. The resistance of the computable standard is previously adjusted and accurately measured in terms of a d-c standard resistor. The range of adjustment for the standard extends from 0.1 to 0.05 ohm. With additional computable standards now under study, and minor modifications of the circuit, measurements can probably be extended to a minimum resistance of 0.001 ohm and a maximum frequency of 104 cps.
Starting Page	123
Ending Page	128
Page Count	6
File Size	1961551
File Format	PDF
ISSN	00972452
Volume Number	75
Issue Number	2
Language	English
Publisher	American Institute of Electrical Engineers
Publisher Date	1956-05-01
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Bridge circuits Resistance Standards Equations Electron tubes Electrical resistance measurement Couplings
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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