Products > Test Equipment
ohms issue with a Fluke 87 - solved
istovit:
my Fluke 87 won't read resistors under 6 ohms,shorting the leads
shows about 6 ohms where before it was less then 1. probing the ma.
input in ohms reads 1005 ohms and 6 at the 10a input. I recently checked
a car batteries voltage while in ohms mode. everything else seems ok.
its an older model 87 before they had battery doors. TIA
BrokenYugo:
I accidentally put like 100V through my Fluke 75 in ohms mode once and had the same problem. I put it in a drawer for about a year, and it magically works fine now.
Fungus:
--- Quote from: istovit on August 15, 2021, 01:25:05 am ---I recently checked a car batteries voltage while in ohms mode.
--- End quote ---
That wouldn't have done anything bad.
To me it sounds more like a problem with the leads.
bdunham7:
Does it read volts correctly? Were there any sparks when you misconnected it? Are the fuses good and of the correct type? (there's a reason I'm asking even though fuses aren't involved in ohms...)
It seem unlikely that you would damage the meter in ohms as it is protected against that sort of thing, and it is even more unlikely that such damage would cause it to read 6 ohms high. Unless, of course, you actually had the leads in the 10A sockets with the switch on ohms mode and your 10A fuse has been replaced with a solid copper bar, then you might do some damage to the common socket, test lead or PCB where the current shunt is kelvin-connected.
Assuming you have a plain old original Fluke 87, here's the relevant part of the schematic.
floobydust:
With 12V on ohms it would not damage anything. 400ohms range test current should be 0.700mA
It might even be a dirty rotary switch adding the 6 ohms.
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