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Old 1st June 2009, 03:13 PM   #1
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Default Praxis software - how do I set the LF cutoff frequency?

Hello DIYs',

I am in the process of getting to know the Liberty Instruments' Praxis software for measuring THD, FFT, frequency response, phase etc.

However, when I use the spectrum RTA 1 Channel acquisition I cannot make the software go below approximately 300 Hz in the measurement screen, although it is supposed to go down to 1 Hz, as set by the start frequency setting (see attached screen dump). I need to be able to go below 1 Hz (and up to around 100 kHz).

Any of you know this software and have suggestions as to how I do this? Also, if any of you have suggestions for other softwares that can measure these parameters I'd appreciate your feedback.

Need be not too expensive (free or < 100 USD).

Thanks, Jesper
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Old 1st June 2009, 04:57 PM   #2
bwaslo is offline bwaslo  United States
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Increase the FFT size. Lowest resolvable frequency hast to be higher than samplerate/FFTsize (you can't know the 1Hz response with less than 1/1Hz of time analyzed.
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Old 1st June 2009, 05:54 PM   #3
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Default @bwaslo

Thanks for the tip - it works! It also makes the screen updates slower (because it needs to sample many more times to obtain data for the window size?) but now I find it really useful.

Maybe you are familiar with this software?

Anyway - many thanks

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