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When taking typical distortion measurements with PC FFT system , which is the preferred IEC 60651 weighting filter to use?
I have been using no weighting to take basic THD% measurements.
Looks like "A" weighting would reduce some of the effects of 60 & 120 cycle hum artifacts from the measurements.
What do you use and why?
Follow Ups:
Those weightings are typically applied when making sound level measurements. "A" is a common one because it approximates human hearing response. I'd think you'd want no filter or a "linear" response for almost any meas of an amp or other device unless you're doing something very special.
NT
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