For this you need a digital oscilloscope to properly record the waveform exactly as it is. Otherwise you need a continuous rotation of the machine to generate a stable waveform because the DMM you are using is reading instantaneous values at its own rate which is slow. That's why you see isolated samples only, which are meaningless. This DMM is cheap and probably measure a stable sinusoidal signal only. Your signal is actually more complex than that. A digital oscilloscope would be the best.
That seems to be a very cheap DMM. This makes overshoot (too high reading before it settles on the true value) more likely. Although half decent DMMs update 3 to 4 times a second and usually don't overshoot (much), a standard DMM isn't the right tool for following a quick changing signal. You can still buy analog MMs, but those are affected to varying degrees by the damping of the needle. A graphing/oscilloscope DMM would be the best choice. Expect to pay a lot more than for this cheapo, though.
Since the output from your generator is a complex waveform, an oscilloscope would prove useful.
As for DMMs, a quality 'true RMS' multimeter such as a Fluke 187 should be way better than that meter you got. Cheap meters don't work worth a damn if what you are trying to measure is not pure DC or pure sinusoidal AC.
For this you need a digital oscilloscope to properly record the waveform exactly as it is. Otherwise you need a continuous rotation of the machine to generate a stable waveform because the DMM you are using is reading instantaneous values at its own rate which is slow. That's why you see isolated samples only, which are meaningless. This DMM is cheap and probably measure a stable sinusoidal signal only. Your signal is actually more complex than that. A digital oscilloscope would be the best.
reuven1967 9 months ago
Tried making an analogue one? All it is is a deflection needle in a box I'm sure it's a good simple project
ConnorXV 10 months ago
That seems to be a very cheap DMM. This makes overshoot (too high reading before it settles on the true value) more likely. Although half decent DMMs update 3 to 4 times a second and usually don't overshoot (much), a standard DMM isn't the right tool for following a quick changing signal. You can still buy analog MMs, but those are affected to varying degrees by the damping of the needle. A graphing/oscilloscope DMM would be the best choice. Expect to pay a lot more than for this cheapo, though.
criscros7 10 months ago
have you put it on the right setting?
22Muddy 11 months ago
i REALLY hate when instead of giving the reading, they just say OL
TheNuclearWatermelon 1 year ago
well these things do put out ALOT of electricity
pixuma 2 years ago
Ok, my 2 cents worth!
That is the cheapest Chinese DMM money can buy!
Get a Fluke or at least spend another $100!
For what you are doing a CRO would be way better!
You can still buy analogue meters Jaycar still have 1 in there catalogue and I think Altronics still do as well.
Other than that, BUILD ONE!!
That way you can have all the features you want.
There have been a lot of designs in EA, Silicon Chip, ETI over the years.
cyberteque 2 years ago
Since the output from your generator is a complex waveform, an oscilloscope would prove useful.
As for DMMs, a quality 'true RMS' multimeter such as a Fluke 187 should be way better than that meter you got. Cheap meters don't work worth a damn if what you are trying to measure is not pure DC or pure sinusoidal AC.
TehMG 2 years ago 3
Thankyou, if i ever set out to make something from that motor i shall have to remember to get better equipment
slainwolf180 2 years ago
screw digital up the ass. we live in an analog world. our world is corrupted with over engineered piles of shit. lol
highdeserthater 2 years ago
very true
slainwolf180 2 years ago