I have been away from the QA403 for awhile and was just trying a loopback test. here is the screenshot. why when the generator is set at 0dbv does rms voltage change with whatever attenuation is set? here it is showing 2vrms.
There is an issue being looked at where switching from, say, 0 to 24 dBV input isn’t resulting in an audible relay click, and the input levels are thus out of sync. Re-starting the software doesn’t fix it, but re-plugging the hardware does. Do you hear a relay click when you switch from atten off to atten on full scale input? (or vice versa)?
I had already unplugged it when I saw this. When I replugged it and tested, it now works and the relay clicks.