# Very low distortion measurements

**URL:** <https://forum.quantasylum.com/t/very-low-distortion-measurements/246>\
**Category:** QA401\
**Created:** [January 30, 2021, 12:02pm UTC](https://forum.quantasylum.com/t/very-low-distortion-measurements/246 "2021-01-30T12:02:27Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![SABristol](https://yyz2.discourse-cdn.com/flex032/user_avatar/forum.quantasylum.com/sabristol/32/380_2.png) [@SABristol](https://forum.quantasylum.com/u/SABristol)\
**Post date:** [February 1, 2021, 8:00am UTC](https://forum.quantasylum.com/t/very-low-distortion-measurements/246/2 "2021-02-01T08:00:37Z")

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Other than determining theoretical bias settings using Ltspice I’ve not tried it the real world using the QA401. It’s something I’ll try when I next get the chance.

Personally I’d start with a short fft length so you get the responsiveness and lengthen as you hone it.

There is an article [here](https://forum.quantasylum.com/t/fft-sizes-with-the-qa401-qa450/124) on fft settings which may help.

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