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Why doesn't my RMS multimeter agree with my Rigol 1054Z scope on the AC VRMS?
Aldo22:
I just wanted to check this on my scope and DMM.
With sine waves the measurements are quite consistent, but with square waves the scope seems to be more accurate than my AN870.
Attached is a screenshot of a 5Vpp / 80% square wave.
I think 2Vrms would be the correct measurement here (?) and 1.97Vrms is close enough.
But the An870 is already 100mVrms below that.
After scratching my head a bit, I reduced the frequency from 500Hz to 100Hz and it starts to match better.
This is probably where the rise time of the Aneng comes into play.
Good to know.
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