Investigations of Noise in Measurements of Electronic Voltage Standards

Published

April 1, 2005

Author(s)

Thomas J. Witt, Yi-hua D. Tang

Abstract

We have investigated noise in measurements of the 10 V outputs of electronic voltage standards based on Zener diode references (Zeners). Zener outputs were compared to NIST Josephson standards using a digital voltmeter (DVM) to measure voltage differences. Because of the presence of serially correlated noise, the data were analyzed by calculating estimated Allan variances which were then used to determine the parameters of a power law model including white and 1/f noise. In many cases the modeled Allan variances agree well with the estimated values over a wide range of sampling times. In all, we have estimated the 1/f noise floor for 25 Zeners of three types. We examined the impact on noise measurements of changes of the range of the DVM and of quantization of the recorded voltages by the DVM. We conclude that there is strong evidence of the presence of a high level of white noise in Zeners.

Citation

IEEE Transactions on Instrumentation and Measurement

Volume

54

Pub Type

Journals

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Keywords

1/f noise, Allan varainace, digital voltmeter, Josephson voltage standard, white noise, Zener voltage standard

Citation

Witt, T. and Tang, Y. (2005), Investigations of Noise in Measurements of Electronic Voltage Standards, IEEE Transactions on Instrumentation and Measurement, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=31722 (Accessed October 14, 2025)