Products > Test Equipment

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

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SeanB:
I had Panasonic cordless phones with a similar supercap that was used to store data like number lists and such in them Those caps never did that, the only failures were the leads breaking off and the cap rattling around loose in the case. 0.022F 5V cap with through hole leads. I retired the last one ( mine) last year as I had run out of spare parts for it, it did 15 years of work. I had a pile that I used for RF modules, antenna's, microphones, speakers, cases and keypad rubbers. The handset flap latches were weak, so I modified it to use a small magnet ( CDROM lens motor) and a reed switch to replace the switch as well. These were expensive units, costing around $150 each when new.

turbo!:

--- Quote from: BravoV on November 14, 2013, 04:17:31 am ---
--- Quote from: turbo! on November 13, 2013, 09:02:23 pm --- :wtf: :wtf:
I opened my up and guess what, its doing it too :(


--- End quote ---

--- End quote ---

Napalm2002:
Has anyone come up with an ideal replacement?

BravoV:
Check post #38, although it is not a fully ideal replacement regarding it's size, but check both datasheets, the CDE Cornell Dubilier type ELDR ultracap can be easily soldered with a bit of tweaking, and since the DMM still has plenty of spare space in there, it should not be a problem.

When it comes to long term reliability, it beats that shitty Matshusita cap out of the water, simply no contest here.



--- Quote from: BravoV on November 10, 2013, 04:21:52 pm ---Btw, that Panasonic cap doesn't have any datasheet, and at the DK page its rated with lifetime @ Temp. 500 Hrs @ 60°C.

Just fyi, at the CDE type ELDR ultracap I pointed previously, after the exposure of 2000 h at +85 ºC ,still capable of maintaining ±30% of the initial measured value.

--- End quote ---

JohnDee:
By the way, I just replaced the supercap on my Fluke 189 and it is now back to life !!  I used the Elna supercap suggested by tsmith35 (reply #7; Digikey PN 604-1147-1-ND) but also bought as a backup the CDE Cornell supercap suggested by BarvoV (reply #38) just in case.  The Elna has the exact same footprint which made the re-soldering a simple task.  As the originator of the initial query, I wish to thank all contributors to this blog for having helped me solve my problem - Cheers !

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