A new and low cost lead resistance compensation technique for resistive sensors

A simple and low cost lead resistance compensation technique for resistive sensors is presented in this paper. A timer IC555 in astable mode is utilized to develop this technique. In the timer output waveform, the time difference between positive pulse width and negative pulse width that are measured sequentially from a single window of digital storage oscilloscope (DSO) is linear with sensor resistance and is completely independent of lead resistance. Theoretical predictions are supported by the experimental data.