In an apparatus for analysing transients in a periodic sequence of signals, a signal averager is used for averaging sequential portions of a repetitive waveform characteristic of a sequence of the transients. In order to compensate for unwanted transient components determined by spurious variations in the peak amplitudes of the incoming signals, a peak detector having a number of independently adjustable output circuits is used to derive compensation signals from the incoming signals, the compensation signals being compounded with the sequential portions of the repetitive waveform.
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