Influence of Signal Disturbances on Measurement Uncertainty of Generator for Testing the Electrical Power Quality Meters

Procedure for analysis of measurement uncertainty of signal generator, applicable in the process of testing the devices for measurement of standard electrical power quality parameters, is described in this paper. This specific analysis includes influence of typical quality disturbances in generated signals on total measurement uncertainty values. Evaluation of individual measurement uncertainty components, including the total uncertainty budget, is obtained according to requirements of Guide to the Expression of Uncertainty in Measurement. In the paper is presented the experimental measurement system for evaluation of measurement uncertainty of software based signal generator. Calibration is performed using reference calibrator Fluke 5500A. Digital multimeter Keithley 2010 is applied for the measurement of generator output voltage values. Total budget of measurement uncertainty components for this signal generator includes the calculation of measurement uncertainty components Type A and Type B, combined measurement uncertainty value and expanded measurement uncertainty of signal generator.