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Title: The Present Status Of An Automated Wattmeter Calibration System In Nml Of R.O.C.
Author: Chen-Joe Fong
Source: 1989 Measurement Science Conference
Year Published: 1989
Abstract: The paper describes the present status of an automated wattmeter calibration system developed in the National Measurement Laboratory (NML) of Republic of China (R.O.C.). The system saves seventy-five percent of manhours required by manual calibration, and reduces errors caused by manual operation. The calibration range is from 120 Watt to 1200 Watt (Power Factorl, t 0.5) and uncertainty is less than + 0.03 % at three standard deviation level. Wattmeter are calibrated under GPIB controller, readings are stored in a database and test report of each meter is printed. Statistical analysis by using system control chart which maintains the system under the best performance is illustrated.

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