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Virtual instrument for instantaneous power measurements

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2 Author(s)
Zrudsky, D.R. ; Optimum Sci. Inc., Austin, TX, USA ; Pichler, J.M.

A computer-based data acquisition system coupled by means of a general-purpose instrumentation bus (IEEE488/GPIB) with a digital oscilloscope is used to create a virtual instrument with instantaneous and average power measurement capability. The software signal-processing capability of the data acquisition system was used to compensate instrument measurement deficiencies and to enhance signal capture. The virtual instrument is shown to provide instantaneous, AC, and fitted-power averages and time-based plots of power variations for both linear and nonlinear system responses to external excitation. Data taken on a resistor, capacitors, an AC-to-DC power converter, and a bipolar junction transistor inverter establish a ±3% sensitivity with a 10-μW-100-W range over a 1-Hz-10-MHz frequency span

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Instrumentation and Measurement, IEEE Transactions on  (Volume:41 ,  Issue: 4 )