Evaluation of Standards for a 10 V MAP Service at NIST
Yi-hua D. Tang, June E. Sims
A Measurement Assurance Program (MAP) provides a method of assessing and maintaining the quality of a measurement process. Such a program has two parts: the operation of a set of statistical tools to ensure the predictable behavior of the standards and measurement systems in a laboratory; and a calibration of the system relative to the SI units from time to time to characterize its drift with time and eliminate its offsets. The need for the latter is best fulfilled through a closed-loop transfer designed to take advantage of the same statistical tools to analyze the uncertainty of the transfer. NIST MAP services are examples of such closed-loop transfers. This paper describes the development of a 10 V MAP service and the problems associated with Zener standards2 that are used as the transfer standards. The uncertainty of a MAP is determined by the behavior of the traveling standards and the measurement systems at NIST and the customer's lab. We will report the recent results of the temperature, pressure, and humidity characterizations for our pool of Zeners. Compensaitng for these effects will reduce the uncertainties contributed by the traveling standards. The calculation of uncertainty for a MAP transfer is also described.
Proc. 2000 National Conference of Standards Laboratories Workshop and Symposium (NCSL)
and Sims, J.
Evaluation of Standards for a 10 V MAP Service at NIST, Proc. 2000 National Conference of Standards Laboratories Workshop and Symposium (NCSL), Toronto, 1, CA, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=28587
(Accessed February 20, 2024)