Bridge Network for Measuring Very Small Impedances from 4.2 to 300 degrees K with a Null-Detector Sensitivity of 10-11 Volt

Christen Kjeldahl Bak, Erik Dalsgaard

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Abstract

An ac measuring technique devised primarily for measuring galvanomagnetic effects in metals is presented. The instrument may, however, be useful whenever it is desired to measure and record continuously impedances in the range 10−3 to 10−8 Omega. The sample assembly is disscussed in some detail. Measurements with the bridge show that in the temperature range 300°K to 4.2°K the noise level changes from 30×10−11 V to 10−11 V without any zero shift, and as a result the lower limit for the impedance range changes from 10−6 Omega to less than 5×10−8 Omega. ©1967 The American Institute of Physics
Original languageEnglish
JournalReview of Scientific Instruments
Volume38
Issue number5
Pages (from-to)649-651
ISSN0034-6748
DOIs
Publication statusPublished - 1967

Bibliographical note

Copyright (1967) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

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