Thinking about the AC wall socket test Dave shows during some of his meter videos....
Originally I had a 2M resistor in series with the output that I injected a voltage on to see if the meter was working. Often, I had an AC wavefrom (wall transformer) in series with a DC supply so I could check both AC and DC modes without changing the setup.
With this test jig, I was thinking to have some sort of higher power bias that could substitute for the AC wall socket test Dave shows. I had thought about just using a transformer but I loose the DC. In the last video, this is why I showed the rectified signal.
I know when I was testing with my 1KV high voltage supply (good for about 1mA) it was not enough current to overcome the protection circuits in the meters. This is why I tested using the antique Drake radio's plate supply. This is good for 300mA average. None of the meters I looked at presented enough load to make that supply droop.
Can't see making an arbitrary generator that can supply KVs at 100's of mA just to stress some meters.... So leaning towards a fixed transformer with rectifier like I showed.
For those crappy meters that actually get damaged when connected to the 220 line, how much current was actually required to get them to fail?