The nice thing is, that today you have cheapish things like the VNWA and the nanoVNA.
Both seem to be pretty capable in doing this.
Well, I'm just in the progress in doing all measurements with these devices and compare them...
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The final calibration adapter is in the works, though.
Of course, I'd add the calibration information to the documentation.
This is a lot of work, however.
That's why I'm asking if there's demand...
I quit my day job and got self-employed because I was fed up with doing work all-day long and nobody cared
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I'm just in a new office, so I did not investigate the "ambient" noise level, yet.
However, you need to use an isolation transformer anyways (preferably a shielded one).
In addition, my LISN has the 250µH inductor as well.
The CISPR16-1-2 standard suggests a minimum isolation of 40dB from 50kHz.
With the usual 20dB from a transformer you should not have too many problems, at least for 150k-30M measurements.
I made my design pretty universal.
It should be pretty straight forward to put 2 of the PCBs in the same enclosure and have the first one form an additional filter if needed
The CISPR 16 series would also allow for something like this.
But you're right, an ac-voltage source is quite beneficial.
73