I built a ARTA measurement box so I can measure impedance and T/S parameters in REW. I am using the box with an external amplifier and a Steinberg UR22C soundcard. Everything seems to be working well however every time I do my open circuit calibration I get this:
It doesn't seem to depend o the measurement levels or switching the input channels. My measurements look ok. I'm just not sure what is causing this and if there is anything I should do to fix it.
It doesn't seem to depend o the measurement levels or switching the input channels. My measurements look ok. I'm just not sure what is causing this and if there is anything I should do to fix it.