# Expanding FR measurement beyond 10Hz-20kHz? **URL:** \ **Category:** QA40x\ **Created:** [November 13, 2021, 3:28pm UTC](https://forum.quantasylum.com/t/expanding-fr-measurement-beyond-10hz-20khz/520 "2021-11-13T15:28:16Z")\ **Posts on this page:** 1\ **Showing post:** 7
**Author:** ![matt](https://avatars.discourse-cdn.com/v4/letter/m/a6a055/32.png) [@matt](https://forum.quantasylum.com/u/matt)\ **Post date:** [November 15, 2021, 9:03pm UTC](https://forum.quantasylum.com/t/expanding-fr-measurement-beyond-10hz-20khz/520/7 "2021-11-15T21:03:09Z")
> That’s the area where we’re looking for the most clarity to start. OK, got it! Take a look at the post below as the physics of low frequency measurements will require careful attention to settings. Can you first try the suggestions there and see if you can confirm the automated low frequency stepped tone sweeps in loopback, and then introduce your DUT and see how things change. But just to double check, it sounds like static (non-stepped) measurements at 1 kHz and low frequencies are making sense is that correct? > [@QA401 Low Frequency Measurements](https://forum.quantasylum.com/t/qa401-low-frequency-measurements/39): > > A customer writes with an issue related to amplitude errors they are seeing on frequency sweeps below 100 Hz. These can manifest as wildly wrong gain values. These are most often related to FFT size and/or window choice in some way. But a change will be made in 1.830 to help with the issue too. The “AMP Frequency Response” plug-in was used to plot the gain of the QA401 in loopback mode, from 2 Hz to 100 Hz, log step, at 5 points per octave (this was at 48K sample rate with Hann windowing). Thes… --- _[View the full topic](https://forum.quantasylum.com/t/expanding-fr-measurement-beyond-10hz-20khz/520)._