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Subject Low frequency sine sweep THD testing

Date Wed Nov 24 2004 13:16
Author Lars Morset (

Here is another issue
>On the swept version, if I leave the default upper and lower >frequncy limits, the plot works fine. However, if I restrict >the range to 10Hz to 200Hz which is what I would like to do >for subwoofer testing, I get a blank plot or nonsensical >THD% values. Am I doing something wrong? I would really like >this to work as it will save me a lot of time.

I checked this and you are right, it does not work if you use exactly the settings you mention above.
The nonsense values has to do with the time window start that is not set to zero. This you can monitor and reset to zero from the time window toolbar. We will try to fix this bug very soon.

But all this should work if you go to 'Measurement->Settings...' and in step 5 set the range from 1 Hz to 200 Hz it will work. Remember that if you want to display THD at 10 Hz, the sine sweep must start before 10 Hz. If it starts at 1 Hz, the 10th order harmonic is at 10 Hz so you can measure up to the 10th harmonic with this setting.

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