Products > Test Equipment
Fluke 189 with leaking surface mount supercap (also Fluke 287, Fluke 289)
Electro Detective:
Mine both look like un-shaven, not so super capacitors
I reckon owners of later model 289, with the internal backup battery instead of the supercRapacitor, will be having similar adventures in a few years time,
especially if the battery sort of internally shorts itself or changes polarity, leaks, or just goes weird... :-// as I've seen happen on PC Bios backup batteries :o
Why oh why did Fluke not fit a CR2032 battery style socket,
someplace where vibrations and leakage won't cause drama ???
or silicone bodge it down... :horse:
These are their flagship meters FFS (For Flukes Sake) and 289 is still current,
this silly business does not instill repeat buyer confidence, especially at those 'forget mates rates' prices...
bayati:
Just to confirm that Fluke could do much better job, it is a picture of Samsung E250 motherboard. The board is made in 2006. It has a ~3.4v lithium battery at least 13 years old. As you see, no leaking and I read 3v on it right now. It is as small as the supercap that is used in the 189/289/287 (if not smaller).
SteinarN:
My first post on this forum.
I've had a 287 for years, but from the start it was draining the batteries in a month or two just by sitting on the shelf, clock also lost its time.
Tonight i was searching this problem and I came over a couple threads on this forum. I have identified the supercap on the pcb and ordered 4 of these:
https://no.mouser.com/ProductDetail/555-DSK3R3H224U-HL
I hope this will cure the illness of my othervise excellent meter.
I have a few small projects I am working on and I hope I can get some help from you for those projects when I start on them later :)
Steinar
say:
It should. Good luck
bayati:
Hi guys.
I changed my 289's supercap.
My meter is built in 2011 Firmware 1.12. Before sharing my experience you should know that Fluke 289 is about 700$ to 800$ in Iran and as it is illegal to be exported to Iran, it is very rare and there is no warranty for it.
First I searched for a replacement cap and the best I could find in Iran was MGC 5.5V 0.33F (size wise not the best choice but the best for me). I bought it for 1$. It is a Japanese Ricoh cap so I believe it will serve for a long time.
I opened the meter and I was reading 0.670v on the old supercap. I shorted it but I still read 0.670 . I disordered it anyway and soldered the new cap with soldering iron set on 330c.
It boot with no problem but the hart attack happened when I checked the meter. It was reading too high!! :scared:
I opened it and thanks to the resent video of Dave, I thought maybe the shield is touching the negative lead of the cap as it is too big. I put tape on it and now it works perfectly. :-DMM
So i confirm that changing the cap does not break the meter. Just be ESD safe and do not turn it on before putting the new cap (I talked with someone who has removed the cap and it's working without it).
Tnx to all.
P.S. In the last picture the leads has been zeroed, that’s why it reads few counts down
P.S. look at the inductor above the supercap!!! I didn’t even touch it and I’m sure that I’m the first one who has opened it. It should be happened at the assembly. :box: :--
*If the pictures don't open use this link: https://photos.app.goo.gl/nmGjZ31ACf3h1owY8
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