NDLI: Transformer bridge for the high-accuracy comparisons of standard resistors at low frequencies

Content Provider	IEEE Xplore Digital Library
Author	Ploshinsky, A.
Copyright Year	1963
Abstract	A transformer bridge has been developed at IMM for comparing low value standard resistors (0.1 /spl Omega/-100 /spl Omega/) at frequencies from 0.5 to 20 Hz. Two current sources and two resistance standards are connected in series in one current circuit. The potential leads of standards are respectively connected through the differential current transformer. The null-detector consists of two identical current amplifiers with a low input resistance. Each amplifier has a Schottky noise as the dominant component. The differential current transformer produces the inverse current pulsations in the input winding of another current amplifier. At 1.2 Hz, the current noise of the null-detector is equivalent to 1 pA in 100-/spl Omega/ resistor (or 10 pA in 1-/spl Omega/ resistor), i.e., a relative sensitivity below 0.001 ppm at room temperature. The bridge has no resonant circuits and can operate using a square-wave current.<>
Sponsorship	IEEE Instrumentation and Measurement Society Bureau international des poids et mesures IEEE International Bureau of Weights and Measures (BIPM) URSI NBS Agency Ind. Sci. & Technol., Min. Int. Trade & Ind. Sci. Council Japan International Union of Pure and Applied Physics (IUPAP) NIST NRCC National Conference of Standards Laboratories (NCSL) Allen Osborne Associates Andeen-Hagerling, Inc. Ballantine Lab. Inc. Clarke-Hess Communications Research Corp. Fluke Corporation Guildline Instruments Hewlett-Packard Co. Julie Res. Lab. Inc. Keithley Instruments, Inc. Measurements International Ltd. Canada QuadTech Inc. Quantum Design Inc. Rotek Instrum. Corp. Tegam Inc. Tektronix Inc
Starting Page	414
Ending Page	417
Page Count	4
File Size	382670
File Format	PDF
ISSN	00189456
Volume Number	44
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-04-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Resistors Frequency Circuit noise Bridge circuits Current transformers Electrical resistance measurement Standards development Current measurement Voltage Thermal resistance
Content Type	Text
Resource Type	Article
Subject	Instrumentation Electrical and Electronic Engineering

Sl.	Authority	Responsibilities	Communication Details
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
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
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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