A simple bench test instrument was developed to measure the real part of the impedance of a patient simulated by a phantom (variable R 350-600 ohm in parallel with C=47nF). The instrument is part of an EIT design which includes a EVM-L137 evaluation kit to enhance previous designs. The DSP included in the kit generates the waveform to control current sources. We use this original signal as a time reference to measure voltage phase, thus minimizing unknown delays. Once data are corrected by a linear fit to remove systematic errors in measurement, the values obtained deviate on average 0.9% from the expected. This instrument will allow to further compare design options in EIT circuit development.
CITATION STYLE
Arregui, M., Santos, E., & Simini, F. (2017). Test bench to validate audio CODEC kit as EIT complex voltage measurement circuit. In IFMBE Proceedings (Vol. 60, pp. 134–136). Springer Verlag. https://doi.org/10.1007/978-981-10-4086-3_34
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