THD measurement

[geadinc]

I've been asked to optimize a compressor/limiter for a client and I need to check the THD response and minimize it. It's not clear to me that SignalScope Pro would work for me or not. Could someone tell me if it does a reasonable job of measuring THD between input and output of a device?

[FaberAST]

SignalScope Pro's FFT Analyzer tool is capable of computing THD with up to 15 harmonics.
In order to get good results, you'll need to use a test signal that's at a frequency that matches one of the frequency bins in the FFT. This is fairly simple if you use SignalScope Pro's built-in signal generator and use the same audio device for both output and input in your measurements.

[geadinc]

Cool, thanks! I'll be using a Presonus Firestudio Mobile to give me the XLR in and out.

[brianf7408]

Am I correct in assuming that the number of spectral lines is equivalent to the number of bins?

[FaberAST]

Am I correct in assuming that the number of spectral lines is equivalent to the number of bins?

Yes. Each line represents one bin.