a DMM set to AC voltmeter that gives very accurate comparisons of voltage upto 50kHz.
I'd still stand by what I say that any meter will read 400Hz as well as 50 or 60Hz to within an acceptable deviation between the two frequencies.
Your 6000 count AC voltmeter will be an excellent comparative tool.I will be using a Fluke 87-V
Use it sensibly and you can be sure that two similar AC voltages @ the same frequency will be an accurate comparison.
Absolute accuracy is generally of much less importance.
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