DocumentCode :
1191896
Title :
An AC-bridge for low-frequency measurements of the quantized Hall resistance
Author :
Delahaye, F.
Author_Institution :
Bur. Int. des Poids et Mesures, Sevres, France
Volume :
40
Issue :
6
fYear :
1991
fDate :
12/1/1991 12:00:00 AM
Firstpage :
883
Lastpage :
888
Abstract :
A simple circuit which makes possible the use of a resistance-ratio bridge based on a cryogenic current comparator (CCC) with both AC and DC is described. The different sources of uncertainty associated with the use of AC in a CCC bridge are discussed. It is shown that they should have an effect which does not exceed a few parts in 10 9 of the resistance-ratio being measured, if the frequency is limited to a few hertz. This analysis is confirmed by experimental results of resistance-ratio measurements between the quantized Hall resistance (QHR) and a 100 Ω resistance standard carried out at DC, 1, 2, and 4 Hz. These measurements are, to the author´s knowledge, the first accurate DC measurements of the QHR. They demonstrate that the quantization of the Hall resistance, observed with AC and for the frequency range studied here, remains complete to within a few parts in 109 or better
Keywords :
bridge circuits; electric resistance measurement; measurement standards; quantum Hall effect; 0 Hz; 1 Hz; 100 ohm; 2 Hz; 4 Hz; AC-bridge; GaAs-AlGaAs; SQUID; cryogenic current comparator; harmonics; low-frequency measurements; mull detector; nanovoltmeter; quantized Hall resistance; resistance standard; resistance-ratio bridge; uncertainty; Bridge circuits; Cryogenics; Current measurement; Electrical resistance measurement; Frequency; Laboratories; Measurement standards; Metrology; Noise measurement; Resistors;
fLanguage :
English
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9456
Type :
jour
DOI :
10.1109/19.119761
Filename :
119761
Link To Document :
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