this some great stuff...
"If you really need to measure .5V..." LOL, my application is, troubleshooting the magneto-driven capacitive discharge ignition on my 1979 outboard motor. The trigger is an inductive pulse that needs to measure >= 0.5V peak AC. Why an RMS or average AC measure isn't good enough, I'm not sure. Output from the capacitor to the coils is 150V up to 400V or more. Don't why this would be an AC measurement, but that's another can of worms altogether.
thanks!