Products > Test Equipment

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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