I wouldn't recommend connecting 230Vac to the inputs of the RTX6001! But as mentioned above, it does have overload protection, so in most cases it should protect itself against high voltages, even if set to the sensitive ranges.
Like mbrennwa, I haven't heard of even a single case of a broken RTX6001 due to overload.
I consider overload protection as one of the very important features. You can do a lot with a good sound card, but there is always a risk of destroying it if you are not careful.
I have had one unit in for repair, but that was not related to overload.
Whether autoranging should be default on or off is probably a matter of personal preference. But I agree that it should be possible to switch it off.
Not so with DiAna. It's RTX aware and does readout the gain settings on a regular basis.
Cheers, E.
You could also take over the control and set the gain settings from your software if you wish.
Lots of good suggestions for a remake
One suggestion that has come up earlier as well is "Fully Isolated ADC/DAC topology".
This is probably possible, but it does present some challenges and risks, plus additional cost.
What is the use case for this?
Does it really have to be isolated, e.g. to be able to inject signals into circuits operating at voltages above/below ground level?
Or is it to eliminate ground loops?
The older AP's used transformers, but as I understand it, the new analyzers do not and are not isolated.