Products > Test Equipment
Fluke 189 with leaking surface mount supercap (also Fluke 287, Fluke 289)
BravoV:
--- Quote from: CSmith on January 03, 2014, 11:17:26 pm ---I opened up two of my Fluke 189's and two of my Fluke 289's, and their supercaps were all in pristine condition despite the passage of time, so some of the supercap's must be up to the challenge. I wonder if it is a supercap manufacturing quality issue such that there were bad batches, or whether there might be environmental influences that help spur them to go bad.
--- End quote ---
Interesting, how old are those 189s and 289s ?
CSmith:
--- Quote from: BravoV on January 04, 2014, 05:01:59 am ---
--- Quote from: CSmith on January 03, 2014, 11:17:26 pm ---I opened up two of my Fluke 189's and two of my Fluke 289's, and their supercaps were all in pristine condition despite the passage of time, so some of the supercap's must be up to the challenge. I wonder if it is a supercap manufacturing quality issue such that there were bad batches, or whether there might be environmental influences that help spur them to go bad.
--- End quote ---
Interesting, how old are those 189s and 289s ?
--- End quote ---
By purchase date, the 189's were acquired in 2002/12/05 and 2003/06/05.
By initial calibration date, the 289's were first calibrated in 2008/5/15 and 2009/6/15.
mjlorton:
After posting a video on the issue I emailed Duane (Fluke). He has just responded with the following:
On 1/6/2014 6:40 PM, Smith, Duane wrote:> We are aware of the failures of this particular part. We are working with the vendor in hopes of determining why these particular parts are leaking.
> Customers who have units either where the cap has failed or experienced leakage can get their units repaired under warranty at their closest Fluke service facility.
> Since this part is soldered to the pcb, customer replacement is not recommended as it will void the units warranty.
>
> The capacitor specification says that the capacitor should draw <150 uA after 10 minutes.
> If there were one measurement to take, it would be to measure battery draw with the unit off after applying the battery voltage for 10 minutes. The
> current draw on failed caps will rise after 10 minutes.
>
> The good news is the supercap is only in the unit to maintain the units date and time. It has no other purpose. It does not support instrument memory or logged /saved readings.
> After we hear back from our component vendor we will determine next steps needed if any but for the short-term customers who own units affected by this part can have it replaced
> under warranty through Fluke service centers worldwide.
>
> Cheers, Duane
ModemHead:
Thanks for looking into this and posting the response. That explains why I have to reset the clock every time I change batteries, but never lose the logged data.
BravoV:
Martin, thanks for the update, really appreciate it ! :-+
--- Quote from: mjlorton on January 07, 2014, 12:43:02 am --->
> The capacitor specification says that the capacitor should draw <150 uA after 10 minutes.
> If there were one measurement to take, it would be to measure battery draw after 10 minutes. The
> current draw on failed caps will rise after 10 minutes.
>
--- End quote ---
Great info ! Now, I'm going to measure mine.
Curious on the time, why 10 minutes ? Edit : NVM, found it in the cap datasheet.
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