Changes and Improvements in the 10 k-ohm Special Calibration Service

Published

August 21, 2003

Author(s)

George R. Jones Jr., Marlin E. Kraft, Randolph Elmquist

Abstract

The 1(ohm) level of resistance has been the source of the lowest standard uncertainties for d.c. resistance calibrations. At the 10 k(ohm) level, equally good transport standards are available and many laboratories also rely on these standards. NIST uses an automated Warshawsky-type guarded bridge circuit to compare these standards at the 10 k(ohm) level, and cryogenic current comparators to maintain the working 10 k(ohm) reference standards. These recent improvements allow a reduction in the quoted uncertainty of our 10 k(ohm) level customer calibrations. We are working to duplicate the Warshawsky bridge and characterize additional standards to prepare for the relocation of this and other measurement systems, upon the opening of NIST's new Advanced Measurements Laboratory.

Proceedings Title

Proc. National Conference of Standards Laboratories Workshop and Symposium (NCSL)

Conference Dates

August 17-21, 2003

Conference Location

Tampa, FL, USA

Conference Title

National Conference of Standards Laboratories (NCSL)

Pub Type

Conferences

Keywords

calibration, Electrical resistance, quantized Hall resistance, resistance scaling

Citation

Jones Jr., G. , Kraft, M. and Elmquist, R. (2003), Changes and Improvements in the 10 k-ohm Special Calibration Service, Proc. National Conference of Standards Laboratories Workshop and Symposium (NCSL), Tampa, FL, USA (Accessed December 30, 2024)