How to - Distortion Measurements with REW

In many cases a PCI soundcard (that is in a regular grounded PC) connected with unbalanced input (cinch) will introduce a ground loop, ruining the measurement results anyway.
Perhaps 'pollute' the measurement results, depending on the ground loop signal content and the test signal content, if using a frequency spectrum plot. And even then, some measurement results may be able to window out any such pollution.
 
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It's here in the settings. Needs to be on Java drivers for that setting to be present. Many people recommend using the ASIO drivers (which I now use).

If you read through the thread and have trouble, post back. It took me quite a while to figure it out with a ton of help from the forum, but everything should be in this thread to get you going.

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Related to layout problems with images wider than 1200px or so, it's because of the old vbulletin tech this forum is using, and the styling could be improved.
I hacked mine by using a Chrome plugin called "User Javascript and CSS" that loads your custom js and css styling to override the existing.
If you want to try this, install the plugin here

then while viewing this forum, click the plugin icon, click Add new, then paste this css code in the right column.

.page {
max-width: 1200px;
}
.highslide img {
height: auto;
width: auto;
max-width: 100%;
max-height: 400px;
margin: 30px 0;
}

When you save and refresh the forum you should see this
Screenshot 2020-07-21 at 13.16.21.png

Instead of this, which is the reason for layout breaking
Screenshot 2020-07-21 at 13.14.40.jpg

I changed even more stuff as you can see in screenshot, adding a fixed header and footer, changed font, padding etc. but this is just quick local hacks, modernizing the whole forum and moving away from table-based layout of vbulletin would be a proper solution, but that's a whole different story.
Screenshot 2020-07-21 at 13.15.53.png
 
A quick question if I may. Would it be feasible to record tones from a DAC into a PCM recorder via XLR for example and then download the PCM files to a PC and analyse them offline with REW? Or am I being stupid?

The recorder is question would be the Tascam DR-100MKIII that uses the AKM AK4558 ADC chip.

Thanks!
 
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