Electronics > Beginners
fuse blown indicator on multimeters?
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ledtester:
I just junked a couple of power supplies because I thought they weren't any good.

Then I discovered that my multimeter fuse was blown.

So that got me to wondering if any multimeters sport an indicator that your fuse used for current measurements is blown. I haven't noticed such a feature on any meters, so perhaps there is reason for it?

helius:
I have some with an indication, some without. When provided, it is sometimes combined with the probe detection feature.
So if either the fuse is blown, or the + probe is not in the correct mA or A socket, an error indication and tone appear when the meter is set to mA or A.

If the probe detection also works the other way, i.e. an error indication if the + probe is in an amps socket with the meter set to a different mode, it can give warning before the user makes a connection mistake that might blow the fuse.

These probe detection features rely on a split pin inside the amps sockets, so they work even before you connect to the circuit under test.
Mr. Scram:
A second multimeter would do the job. Any time an unexpected result turns up on a number of units you should be wary of the equipment you're testing with. In my experience you should be anyway, as even the best stuff breaks and does odd things. Or sometimes it's simply a wrong assumption or piece of knowledge that trips you up.
TomS_:

--- Quote from: Mr. Scram on June 13, 2018, 04:09:08 pm ---A second multimeter would do the job. Any time an unexpected result turns up on a number of units you should be wary of the equipment you're testing with.

--- End quote ---

Unless you do the same silly thing and blow the fuse in both of your meters leading to the same unexpected result. :-DD
tpowell1830:
Training... experience...

Hope this helps...
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