Old measurements, new techniques DSP drives speed and accuracy; coherence saves the day.(Technical)

EDN,  October, 2001  by Thomsen, Carsten

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DSP TECHNIQUES LEAD TO FASTER, LESS COSTLY FREQUENCY-RESPONSE TESTS AND ENABLE THE USE OF A POWERFUL CONCEPT, THE COHERENCE FUNCTION, WHICH ACTS AS A WATCHDOG TO HELP IDENTIFY AND QUANTIFY COMMON BUT EASY-TO-MISS MEASUREMENT ERRORS. BEST OF ALL, THIS WATCHDOG WORKS FOR FREE.

To engineers who are used to worrying about the quality and precision of signal generators, the cross-spectral technique for measuring frequency response should come as a welcome relief, because it relaxes the requirements on the signal generators used in the measurements. Drift, amplitude stability, ...

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