IMPEDANCE MEASUREMENT USING SINE FITTING ALGORITHMS |
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| Manuel Fonseca da Silva, Pedro Miguel Ramos, António Cruz Serra |
- Abstract:
- This paper describes an impedance measurement technique based on the use of a personal computer, two digitizing channels and the application of a four parameter sine fitting algorithm, that estimate amplitude, phase, offset and frequency of the voltages across the impedance under measurement and of a reference impedance. This simple and inexpensive setup leads to experimental results with accuracy comparable to those obtained with sophisticated high cost dedicated impedance measurement equipment. The results here presented, obtained by using a low cost 12 bit PC data acquisition board, for impedances with magnitudes below 1kΩ at 1kHz, show relative standard deviations of Z below 0.002% and standard deviations for the measured phase under 0.001º.
- Keywords:
- Impedance measurement, sine fitting
- Download:
- IMEKO-TC4-2002-146.pdf
- DOI:
- -