I was checking my AFM today with my cheap ohm meter and was wondering if you could help interpret some of the readings. First, after doing one test, my ohm meter read ".OL m ohms. According to the FSM it supposed to read infinity. I'm wondering if the reading on my ohm meter (.OL m ohms) is the same as infinity.

Also, another terminal test is supposed to read "zero" ohms, but my ohm meter said
00.4 ohms. Their was no variance (+ or -) with the zero ohms value from the FSM, but I'm wondering if 00.4 ohms is acceptable?

Thanks,

Mike

 

Yeah, 'OL" usually means "Over Limit." Some DMMs use that to indicate infinite ohms, or at least, higher resistance than it can measure.

What does the meter show when the leads are just hangin free, touching nothing?

00.4 could just be the resistance of the wire leads... when you just touch the two test probes together, what does the meter read?

 

Yes, .Ol means the meter is over limit, for your purposes, infinite. Do make that if your multimeter is not autoranging, that you have it set at the highest scale.

0.4 Ohm is essentially zero. This could be from the calibration of the meter itself, or resistance in the leads, item measured, etc. Either way, its close enough.