On 7/8/2019 10:56 AM, John Robertson wrote:
...
I'd use a 'scope and do the math if the readings are critical and you
can't afford a proper AC meter

The readings aren't at all critical - a single-digit correction factor
would be good enough.

I wonder if the meter reading has a consistent relationship to the RMS
value. E.g., if the meter always used the peak value, the actual value
would simply be 0.7 the read value. If it was consistent, I could
calculate the correction factor by measuring the peak on a scope. But I
wouldn't want to have to generate correction curves.