Muttley600
New Member
Keep in mind, Graham, that for the most part, this is all an exercise to explain the difference between the peak AC level(s) you see on a scope and what a multimeter will display as an AC voltage level. With a Sine Wave ONLY:
I know, I just want to make sure my understanding is 100% firm, accepted it is only for a sine wave **broken link removed**
ok, lets try & realte to this formula, the numbers aren't important but the process is what I'm trying to see & the numbers should give me that process
View attachment 61914
If the Peak to Peak value (from the scope) is 3.84VAC
Vpeak
then the 0 to Peak is 1/2 that, or 1.92.
This is the divide line between Vpeak & square root symbol
Multiply 1.92VAC times 0.70711
So this must be the square root symbol but is not actually relating to square root on this occasion, how confusing is that for a beginner **broken link removed**
and you'll get the 1.357VAC RMS value.
This is the Vrms =
& the sad part, I still don't think I've understood it correctly **broken link removed**
Multiplying ANY 0 to peak AC voltage level by 0.707 will give you the RMS value that you will see on most multimeters, sim or real.
See, now I have noted that, that is real world useful information **broken link removed**
I got the sim multimeter to behave in the three sims below.
Is that because you changed the battery for a function generator
I should add that I generally limit my use of a multimeter in circuits of this type to DC and resistive values. For all AC work I use a scope.
Makes sense, but what happens when we have things like we are working on, still scope **broken link removed**