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Look165

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Full wave voltage reading

DMM work perfectly with sine wave, but not with other signals.

a Ã©crit le 11/07/2019 Ã* 21:36Â*:
On Thursday, 11 July 2019 04:54:24 UTC+1, Phil Allison wrote:
** Nutcase Thornton spewed:

tabby wrote:
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.
When I looked into this decades ago, digital meters typical read the peak & reported 71% of that.
** Nope - non RMS multimeters do just what analogue multimeters do and scale the average value of the rectified AC wave.

I just tried two '80s 3.5 digit DDMs and found they read 125mV on a wave that was 300mV peak. The wave was 50Hz with a few harmonics, the current draw of a small amplifier.

..... Phil
Ah yes, the sample of 2 proves how the rest of the universe is.

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