On Friday, July 10, 2015 at 5:11:27 AM UTC+2, whit3rd wrote:
On Thursday, July 9, 2015 at 9:29:58 AM UTC-7, Jim Wilkins wrote:

[about odd AC measurements on a DC/AC inverter]

If you have a (possibly sacrificial) way to heat water with the
inverter you could time how long a measured amount of room temperature
water takes to boil on the inverter and on Netzstrom. They should be
pretty close to each other.

Bingo! An electric coffeemaker's brew time for a given water fill is
a better RMS voltage meter than most inexpensive electronic meters.

I thought of that, but my water kettle is 2200w. As to getting a scope or variac or true RMS meter, I'm the only one I know who even owns a DVM! Some of my friends are aircraft engineers, but couldn't jump start a car with a gun to their head. No, I'm all alone here as to equipment. I think I'll just trust my step down transformer test. I was only worried that with such a high reading I might burn up a power supply or maybe even have a fire.

Thanks all!

PS. The meter is a TopCraft TMMH-930. You can download the manual, but would need to speak either Dutch or German to read it!