How do I test an amp for Damping Factor?

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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.
I will be using a Fluke 87-V
Your 6000 count AC voltmeter will be an excellent comparative tool.
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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