Products > Test Equipment

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

<< < (8/64) > >>

tsmith35:

--- Quote from: M. AndrĂ¡s on November 06, 2013, 08:31:22 pm ---i know what the warranty states but what is that damn component falls under?
--- End quote ---
??? It's not a battery, so it seems pretty straightforward.

BravoV:

--- Quote from: dr.diesel on November 06, 2013, 08:29:31 pm ---My 289's cap was completely shorted.  I'd kinda been wondering why new batteries only lasted 2-3 days before going ka-put   :-//, however not enough to actually spend the time tearing it down!  I've modified mine with a 2.1mm DC jack, it's been powered by a power supply for years sitting on the bench.

--- End quote ---

Great to know this, thanks for sharing. For sure I will be watching the batteries consumption rate, if its getting significantly faster than it used to.

Other thought, with that shorted cap, just curious if that heated up cap will increase the ambient temp inside the DMM significantly ? Cause the DMM case is quite thick and made from 2 layers of different plastics which is quite effective to seal out the heat from inside.  :-//

Assuming we're not going to chase for warranty from Fluke, on the cap replacement, is there any better alternative brand/type of supercap that won't leak and has much more longer life than just <5  years ? Size wise for the replacement cap is not that critical since there should be enough space.

dr.diesel:

--- Quote from: BravoV on November 07, 2013, 01:16:02 am ---Great to know this, thanks for sharing. For sure I will be watching the batteries consumption rate, if its getting significantly faster than it used to.

Other thought, with that shorted cap, just curious if that heated up cap will increase the ambient temp inside the DMM significantly ? Cause the DMM case is quite thick and made from 2 layers of different plastics which is quite effective to seal out the heat from inside.  :-//

Assuming we're not going to chase for warranty from Fluke, on the cap replacement, is there any better alternative brand/type of supercap that won't leak and has much more longer life than just <5  years ? Size wise for the replacement cap is not that critical since there should be enough space.

--- End quote ---

Mine had a phantom draw, I knew it was there just never bothered to find it cause it was bench powered, easy enough to test by measuring standby current.

Since it's only the settings and date/time that is stored by the supercap, reliability really isn't that much of a concern, just replace the cap if and when it goes bad, especially since you can buy like and kind for about $2.50.

Your correct though, there is plenty of room if you'd like to retrofit a higher voltage piece, hopefully with longer life.

BravoV:

--- Quote from: dr.diesel on November 07, 2013, 01:30:10 am ---Since it's only the settings and date/time that is stored by the supercap, reliability really isn't that much of a concern

--- End quote ---
Agree, its just I don't like the idea of knowing that the cap is keep growing nasty brown goo, that may leak or burst it's liquid once the container is weakened enough by corrosion caused by that brown stuff.  |O

Possible candidates are CDE Cornell Dubilier type ELDR ultracap (Datasheet) which highlights the long-life feature than ordinary ultracap.



Same capacitance as original cap at 0.2F 3.6V, and cost $2.79 a pop at Digikey -> EDLRD224H3R6C, has two terminals styles like above pics, just abit bigger than original cap and not much, and I think its still manageable like by bending it's legs to fit in the solder pads.

true:
I've repaired a couple of these (that otherwise wouldn't turn on) with 22uF MLCCs. As long as batteries are in the unit it works fine...I think they may lose settings during battery change but it's been a while since I've had to change them, maybe I should check?

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod