A precise null-balancing technique (PNB) for the 10 V Josephson junction array voltage standard system

Author

Yoshida, Haruo ; Kozakai, Tuneoki ; Murayama, Yasushi

Author_Institution

Adv. Labs. Ltd., Miyagi, Japan

Volume

46

Issue

2

fYear

1997

fDate

4/1/1997 12:00:00 AM

Firstpage

260

Lastpage

263

Abstract

A precise null-balancing technique, which we call the PNB technique, has been developed for the 10 V Josephson-junction-array voltage standard system (10 V JJAVS) in order to improve the accuracy in null detection. Precision is achieved by (1) precisely capturing the desired Josephson step within ±3 step by using a newly developed mercury reed-relay switch, (2) adjusting the millimeter-wave frequency to attain strict null-balancing, and (3) using a stable chopper-type of digital voltmeter (DVM) as a null detector. This PNB technique was successfully applied to a 10 V JJAVS attaining a total uncertainty of 6×10^-9 and reducing the calibration time to 20 min to 30 min

Keywords

calibration; choppers (circuits); digital voltmeters; measurement standards; millimetre wave devices; reed relays; superconducting junction devices; voltage measurement; 10 V; 20 to 30 min; JJAVS; Josephson junction array voltage standard; PNB technique; calibration time; chopper digital voltmeter; mercury reed-relay switch; millimeter-wave frequency; null detection; null-balancing; uncertainty; Circuits; Detectors; Frequency; Josephson junctions; Laboratories; Millimeter wave technology; Scattering; Standards development; Switches; Voltage;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.571827

Filename

571827