[Otto]

Hi there,

Well, once you do the analog cal with the loopback cable, you will be able to do a sweep (with the loopback cable still in place) and it should measure perfectly flat. You can then insert the receiver in the loop (still using analog I/O) and measure essentially flat (if it's not flat, you will knw that it's a contribution of the receiver that's off). After that, you can measure with a digital output (and analog back to the PC). If that result is the same as your analog measurement through the receiver, I'd say you are good to go with the digital. If there's any significant difference, stick with the analog.

In the end, I think it'll be pretty close either way. Do let us know the delta between the analog measurement and the digital measurement. Like I said, when I did that, I got generally identical results.

Good luck!