Direct Resistance Comparisons From the QHR to 100 Megohm Using a Cryogenic Current Comparator

Published

April 1, 2005

Author(s)

Randolph Elmquist, Emmanouel S. Hourdakis, Dean G. Jarrett, Neil M. Zimmerman

Abstract

Measurements of 100 megohm standard resistors and cryogenic thin-film resistors based directly on a QHR standard have been made with a cryogenic current comparator (CCC) bridge. This 15496:2 ratio CCC attains a current sensitivity of 10.7 fA/Hz1/2 in measurements of cryogenic thin-film resistors without extensive shielding or filtering. A resistive primary winding helps the CCC maintain stability in the presence of external noise. The resistive-winding technique may be useful for the absolute measurement of small currents delivered by single-electron tunneling devices.

Citation

IEEE Transactions on Instrumentation and Measurement

Volume

54

Issue

2

Pub Type

Journals

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Local Download

Keywords

Single-electron tunneling, Quantum Hall effect, Resistance standards, Johnson noise

Citation

Elmquist, R. , Hourdakis, E. , Jarrett, D. and Zimmerman, N. (2005), Direct Resistance Comparisons From the QHR to 100 Megohm Using a Cryogenic Current Comparator, IEEE Transactions on Instrumentation and Measurement, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=31719 (Accessed November 4, 2025)