Transient Reduction in Pulse-Based Impedance Measurements

Carles Aliau-Bonet, Ramon Pallas-Areny

Abstract

Impedance measurements based on voltage pulse injection and current detection are simple to implement and fast, but transients produced in the current-to-voltage converter can yield large deviations in the impedance measured. Because those transients depend on the impedance being measured itself, it is difficult to avoid them when the measurement range is large. We propose to reduce those transients by controlling the rise time of the pulse being injected. For a particular implementation of the method, transient amplitude has been reduced to less than 2 % of the full scale voltage, as compared to 36 % overshoot for fast voltage pulses.

Keywords

impedance measurement, pulse injection, transimpedance amplifier

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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