DC 10:1 Hamon divider with cryogenic contacts

Author

Kyu-Tae Kim ; Sung-Won Kwon

Author_Institution

Korea Res. Inst. of Stand. & Sci., Taejon, South Korea

fYear

1998

fDate

6-10 July 1998

Firstpage

102

Lastpage

103

Abstract

A study on a DC Hamon divider with superconducting contacts (cryo-contacts Hamon divider) is described. The contact resistance error of the switch had been one of the most significant error sources in the conventional Hamon divider. A specially designed cryogenic switch made of Pb was used at liquid helium temperature for a series-parallel connection of the Hamon resistors which form the upper arm of a Wheatstone bridge for a self calibration. The 10:1 ratio uncertainty of the preliminary measurement is expected to easily reach a 0.1 ppm level.

Keywords

bridge circuits; calibration; contact resistance; electric resistance measurement; measurement standards; potentiometers; superconducting switches; voltage measurement; 10:1 ratio uncertainty; DC Hamon divider; Hamon resistors; Wheatstone bridge; contact resistance error; cryo-contacts Hamon divider; cryogenic switch; self calibration; series-parallel connection; superconducting contacts; upper arm; Bridge circuits; Calibration; Contact resistance; Cryogenics; Electrical resistance measurement; Helium; Resistors; Switches; Temperature; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Precision Electromagnetic Measurements Digest, 1998 Conference on

Conference_Location

Washington, DC, USA

Print_ISBN

0-7803-5018-9

Type

conf

DOI

10.1109/CPEM.1998.699803

Filename

699803