True RMS DMM

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#41
Salas said:
You can stop it:

Set Beeper Off
Press the RANGE button while turning the meter on to temporarily disable the Beeper feature. Turn the rotary switch OFF and then back on to resume.

To drop its level it would take to hack a trace and put a resistor in series to it I am afraid
Click to expand...

Sorry I wasn't clear Sala. I meant for continuity tests.

So, there isn't any way of adjusting the level other than modifying the PCB eh? OK, so be it then...
 
#44
FWIW, in my 45+ year career plus the same as an audio hobbyist, I can count the times I've really needed TRMS on maybe two fingers. Is it a sine? TRMS not needed. Is it something else? What are you going to do with the number? BTW, most TRMS meters won't give you the correct answer if the signal has a DC offset. They AC couple it and that won't give you the equivalent heating value. You need to make an AC and DC measurement, then do a root sum of the squares. See https://masteringelectronicsdesign.com/how-to-derive-the-rms-value-of-a-sine-wave-with-a-dc-offset/ There are a few meters that do this correctly, but not the cheap ones. So, IMHO, TRMS is good for bragging rights, but rarely "truly" needed.
 
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