DocumentCode :
1412973
Title :
An a.c. double bridge with inductively coupled ratio arms for precision platinum-resistance thermometry
Author :
Hill, J.J. ; Miller, A.P.
Volume :
110
Issue :
2
fYear :
1963
fDate :
2/1/1963 12:00:00 AM
Firstpage :
453
Lastpage :
458
Abstract :
A simple double bridge with inductively coupled ratio arms for precision resistance thermometry is postulated, and the advantages to be gained from the accuracy, stability, low temperature coefficient, high input impedance and low output impedance of such ratio arms are considered. The equation of bridge balance is examined, and it is shown that the errors in measurement due to the resistance of the potential leads of the thermometer can be reduced to 0.0001°C for any temperature change between ¿100°C and +100°C and are unlikely to exceed 0.0003°C over the range ¿183°C to +630°C. A double bridge having eight decade dials and operating at 400c/s has been constructed, and the details are given. The errors of voltage division within the ratio arms are less than 2 parts in 107, and the input impedance is approximately 650k¿.
Keywords :
bridge instruments; measurement by electrical methods; thermal variables measurement;
fLanguage :
English
Journal_Title :
Electrical Engineers, Proceedings of the Institution of
Publisher :
iet
ISSN :
0020-3270
Type :
jour
DOI :
10.1049/piee.1963.0068
Filename :
5247882
Link To Document :
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