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| ohms issue with a Fluke 87 - solved |
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| LazyJack:
Check the input jack where it is soldered to the pcb. On older 87s the solder or the jack can crack. |
| Fungus:
--- Quote from: istovit on August 17, 2021, 03:54:34 am ---this may happen more often than we think and could go unnoticed being only a few ohms --- End quote --- Nope. Not around here. This is a bad contact, bad lead or bad solder joint in the input jack. Wiggle the leads, press on the input jacks, see of it varies. |
| bdunham7:
--- Quote from: Fungus on August 17, 2021, 08:17:11 am ---Nope. Not around here. This is a bad contact, bad lead or bad solder joint in the input jack. Wiggle the leads, press on the input jacks, see of it varies. --- End quote --- I have had several meters, including bench models, with intermittent input connection problems and they can be devils to track down depending on where the issue is. I wonder if it is possible for a cracked solder joint to creep back together given enough time in a desk drawer? |
| AVGresponding:
--- Quote from: bdunham7 on August 17, 2021, 03:52:31 pm --- I wonder if it is possible for a cracked solder joint to creep back together given enough time in a desk drawer? --- End quote --- Probably, through the formation of tin whiskers. |
| istovit:
just finished cleaning the rotary switch and were still between 2-3 ohms with leads crossed 1003 ohms at the ma. input and 2.3 at the 10a input. with the delta function I was able to read a 2 ohm resistor. I could live with this but would rather not,what protection components are involved when a voltage is applied in ohms mode? TIA |
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