Products > Test Equipment

Fluke 189 with leaking surface mount supercap (also Fluke 287, Fluke 289)

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jucole:

--- Quote from: mjlorton on January 09, 2014, 01:17:03 pm ---I've attached the datasheet for the supercap.

--- End quote ---
Thanks Martin for clarifying the actual part number used.

BravoV:
Even though its harmless, is it fair to expect from a high end Fluke's DMM series that use component that doesn't poo ?  :(

Its very disappointing, especially they already knew it from the beginning.  :--

eb4eqa:
Hi all,

I found leackage on the top of the cap in my 289 (5 years old). I simply removed it since I don't change batteries that frequently but I do want to prevent further damage to the PCB.

I use eneloops in it and they last for a long time with the use I make of the meter. I am a big fan of those batteries, highly recommended.

Thanks from bringing this up,
Roberto EB4EQA

CSmith:
I really do appreciate Fluke's continued use of common AA batteries in their handheld meters, especially compared to Agilent's (Keysight?) use of AAA batteries that do not last very long at all in these more sophisticated meters.

ron:
What corrosion?  What "corrosive" material is in a cap?  Remember that the original poster thought it was a battery cell.

I just checked my oldest 189 and sure enough the cap had obviously leaked.  I used a tooth pick to remove the most of the dried brown crud (Latin term for dielectric?) and wiped the remaining residue off with a q-tip dampened with IPA.  Looks clean now.  Under a 20x loupe, I see no pitting or "corrosion" on the cap case.   The residue is harmless except it indicates a failed or failing cap.
Yes, this cap has a problem, but it isn't going to corrode the pcb or anything else.
Don't panic.  :)

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