Products > Test Equipment
ohms issue with a Fluke 87 - solved
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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