small current

Jul 19, 2006 4 Replies

I'm trying to measure some small current (probably 25 mA) using a Fluke



75 Series II multimeter. I have the black probe in the COM slot and the red probe in the 300 mA slot. Then I connected the red and black tips to the same node of my circuit and turned the knob to Amperes DC. Is that right?

It keeps saying .01 - I think it might be in amperes. Is there a way to get it in mA?



Thanks.



You say you are connecting the probes to the same node in the circuit. Have you opened the circuit so you can insert your meter? Your meter has to be *in* the current path - you won't measure anything if you simply probe across a piece of wire :)

That aside, if you have your meter set on 300mA (autoselected by the probe slot on some meters), it will read in mA already.

That tells me you probably haven't connected your meter up properly.

Cheers

PeteS

No. Spice works that way, but Flukes don't. A Fluke measures the current that flows *through* it.

John

Hi, Mike. If you open the node so the current is flowing through the Fluke, you're doing it right. It's autoranging, so it should shioft down to the 200mA scale automatically.

It's also possible you popped the fuse. That would be my first guess. Open up the meter and take a look. Be sure to order a spare if you need to replace it.

Good luck Chris

"PeteS" wrote in news: snipped-for-privacy@m79g2000cwm.googlegroups.com:

*snip*

It seemed to me that when I connected my meter set for Amps as I do for volts it basically said "Give me all the current you got, I can take it." Good way to blow a fuse.

This is before I found out the amp meter goes *in* the current path. Now I know better. (But not enough better to not personify the meter ;-))

Puckdropper

Wise is the man who attempts to answer his question before asking it. To email me directly, send a message to puckdropper (at) fastmail.fm

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