QA403 THD only goes up to 8kHz even with 192 kHz sample rate?

Is there a way to change this? I would very much be interested in reading THD measurements at say 20kHz. I have my sample rate changed to 192kHz so I should be able to measure 3 harmonics of 20kHz at least. I even changed the x-axis scale and stuff. Am I doing something wrong?

Did you try and right click the THD button and set the range there?

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Ah, yep, that seemed to do the trick. Thanks!