Electronics > Beginners

fluke dmm, really need help

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ataradov:

--- Quote from: Cody Turner OKC on July 13, 2018, 04:58:31 am ---it says 200A 250VAC, not sure why?
--- End quote ---
My bad. FNM-5 is a 5 A fuse. And 200 A is an interrupting capacity.

Shock:
If you watch the video resistance check of the mA/uA fuse is a slow blow as he says typically will show as 1K ohm. The 10A is showing an ohm or so (mines even less).

Put the correct fuses in it, and test it then. In the meantime leave them out and don't connect into the current sockets, no accidents.

A hint also never use the multimeter to test for current if you are unsure, otherwise you will just end up blowing fuses. When you know you're expecting say 100mA and want to measure the exact current then you first measure on the 10A range and see it's in a safe range to move to the mA/uA socket to get an accurate measurement.

ataradov:
I would get properly rated fuses, even if they are not exactly Fluke endorsed. This will ensure relative meter safety. And your safety is ensured by not working on high energy circus.

Also, a set of Fluke fuses costs more than some decent meters. May be pick one of those up as well.

MosherIV:
Hi.

Well done for doing all that hard work gardening and on scoring a decent meter.  :-+

If you want to measure current while you do not have fuses, put a small resistor (eg 10 \$\Omega\$) in line with the circuit. Then measure the voltage across the resistor, use ohms law to calculate the current ( I = V ÷ R  )

I think the 87 has mV range which should help with resolution.
Do not forget to measure the resistance to get accurate results.

Mr. Scram:

--- Quote from: MosherIV on July 13, 2018, 07:00:41 am ---Hi.

Well done for doing all that hard work gardening and on scoring a decent meter.  :-+

If you want to measure current while you do not have fuses, put a small resistor (eg 10 \$\Omega\$) in line with the circuit. Then measure the voltage across the resistor, use ohms law to calculate the current ( I = V ÷ R  )

I think the 87 has mV range which should help with resolution.
Do not forget to measure the resistance to get accurate results.

--- End quote ---
Good tip. Don't go messing with the wrong fuses.

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