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Title: A 160 Ppm Rms Digital Voltmeter For Use In Ac Calibration
Author: Ben Brodie
Source: 1982 Measurement Science Conference
Year Published: 1982
Abstract: Until recently it has been possible to measure true rms ac to an accuracy of approximately 1000ppm with a direct reading digital voltmeter. Even accepting the use of an average responding converter can only increase the accuracy to 600ppm with the inherent restriction that the reading is true for just pure sine waves. To make more accurate rms measurements, it has been necessary to use a transfer standard such as the Fluke 540B, but single measurements take up to 5 minutes for full accuracy. A new true rms voltmeter has been developed which enables fast readings to be made to an accuracy of 16Oppm for 90 days over a frequency band of 4OHz to EOkHz. This converter is used in a new instrument based on the Fluke 8502A digital multimeter

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