Test & Measurement interface for Soundcard

[Eliad]

I see the description of the device on Pete Millet, is there a user manual to explain in more detail testing/calibrating of this device? I read through the thread and got some ideas but my level is quite low and it would be better if there is an user manual.

For software I see ARTA has been recommended more recently, AudioTester is no longer available. ARTA is also now freeware, you cant beat the price.
What are the recommendations for an USB soundcard?

 

[alexcp]

Here is how to do the adjustments (link to the source):

After you stuff it, you need to make a couple of adjustments to calibrate the meter section. There are two adjustments on the board. One is to zero the DC offset of the input amp - this could probably be left out with no ill effects. Basically you set the range to 200mV, short the input, and turn the pot to get as close to a zero reading on the DPM as you can. You will never quite get to zero, because there is AC noise here as well. Mine"zeros" to 0.3mV.

The other adjustment is a full-scale adjust. If you have a calibrated AC voltmeter, you can set the full-scale adjust to make the DPM match the reading on your meter, with the input signal of your choosing. If you only have a DMM, you can use it - just feed in a 50 or 60Hz signal (filament voltage would work) to both your DMM and the soundcard interface, and adjust the full-scale pot so the reading you get matches your DMM. (Don't try this with any other frequency, or anything but a sine wave, unless you have a really good DMM - most are only accurate on line frequency).