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Design considerations for a CCC bridge with complete digital control.

Williams, J M; Rietveld, G*; Houtager, E*; Janssen, T J B M (2011) Design considerations for a CCC bridge with complete digital control. IEEE Trans. Instrum. Meas., 60 (12). pp. 3907-3912.

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Abstract

The design considerations for a completely digitally controlled cryogenic current comparator resistance ratio bridge are described. The digital control facilitates adjustment of calibration factors and optimization of the gain settings in the control loops. The design of the digital control loops is analyzed and the effect of parameters such as sampling rate, number of bits and digital gain on the measurement uncertainty is calculated. It is shown that the final performance of the bridge is limited only by the accuracy of the current comparator, the noise sources associated with the current and voltage null detectors and the resistors under test.

Item Type: Article
Keywords: Cryogenic current comparator, Digital measurements, Resistance measurement, Noise measurement
Subjects: Electromagnetics
Electromagnetics > Electrical Measurement
Identification number/DOI: 10.1109/TIM.2011.2149330
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/5393

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