Abstract
On-going research within our department concerns the testing of thyristor drives for traction use. As a result of this work it became necessary to digitise the repetitive variable-frequency signals produced by the drives, to obtain by software processing root-mean-square and average values of current and voltage waveforms. This was undertaken primarily for calibration and comparison with standard methods of obtaining average and root-mean-square values using meters and integrated analogue devices like the AD636J. The paper describes the hardware and software developed around a low-cost microcomputer BBC Model B, to digitise a complex waveform and calculate its r.m.s. and average value.
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