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

doi:10.1063/1.1720791

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

Department of Physics

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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 language	English
Journal	Review of Scientific Instruments
Volume	38
Issue number	5
Pages (from-to)	649-651
ISSN	0034-6748
DOIs	https://doi.org/10.1063/1.1720791
Publication status	Published - 1967

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

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. {\textcopyright}1967 The American Institute of Physics",

author = "Bak, {Christen Kjeldahl} and Erik Dalsgaard",

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.",

year = "1967",

doi = "10.1063/1.1720791",

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T1 - Bridge Network for Measuring Very Small Impedances from 4.2 to 300 degrees K with a Null-Detector Sensitivity of 10-11 Volt

AU - Bak, Christen Kjeldahl

AU - Dalsgaard, Erik

N1 - 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.

PY - 1967

Y1 - 1967

N2 - 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

AB - 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

U2 - 10.1063/1.1720791

DO - 10.1063/1.1720791

M3 - Journal article

SN - 0034-6748

VL - 38

SP - 649

EP - 651

JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

IS - 5

ER -

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

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