An automated AC-DC transfer calibration system |
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Authors: | Filipski P.S. Rinfret R.L. |
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Affiliation: | Inst. for Nat. Meas. Stand., Nat. Res. Council of Canada, Ottawa, Ont.; |
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Abstract: | Improvements in the National Research Council of Canada (NRC)'s ac-dc transfer capabilities have been achieved through full automation of the ac-dc transfer comparator, extensive redesign of the control software, and modification of the voltage buildup procedure. Hardware additions to the comparator design include stepping motor-driven switches and a range changer of a commercial electronic transfer standard. Redesigned software can be easily modified to accept new instruments and new procedures. The NRC voltage buildup procedure has been modified at the 500- and 1000-V levels. The expanded uncertainty assigned to the NRC working standard is given, and its components are briefly discussed |
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