Title :
Simple power measurement system
Author_Institution :
SIQ, Ljubljana, Slovenia
Abstract :
A simple power measuring system for low frequencies and sinusoidal conditions is described using commercially available instrumentation. It is composed of a phantom power source, current shunt, two sampling voltmeters and controlling computer. Power is calculated from measured voltage, current and phase of the phantom source. The uncertainty budget is evaluated after voltage and phase corrections are applied. Selection technique for current shunts as absolute current to voltage converters is proposed. Using such a system, an uncertainty of 60 μW/VA was achieved
Keywords :
calibration; computerised instrumentation; digital instrumentation; measurement uncertainty; power measurement; absolute current to voltage converters; commercially available instrumentation; computer control; current shunt; low frequencies; phantom power source; phase correction; power measurement system; sampling voltmeters; sinusoidal conditions; uncertainty budget evaluation; voltage correction; Computer errors; Current measurement; Feeds; Frequency measurement; Imaging phantoms; Phase measurement; Power measurement; Sampling methods; Transconductance; Voltage measurement;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 2001. IMTC 2001. Proceedings of the 18th IEEE
Conference_Location :
Budapest
Print_ISBN :
0-7803-6646-8
DOI :
10.1109/IMTC.2001.928236
