Fluke 289 bad supercapacitor replacement repair

[AleXis6]

Re: Fluke 289 bad supercapacitor replacement repair

After the 10 years has passed, you need the proof of purchase

I hate this kind of warranty

[CapLeaker]

Re: Fluke 289 bad supercapacitor replacement repair

I think similar due to enough space around.
which supercapacitor you used last time ?

Last time I replaced it with an ELNA DSK-3R3H224U-HL. BTW this part number is still current. Mouser and Digikey have them on back order. So it may be good to wait if time is reasonable. It's about 6.8mm in diameter and height is about 2.8mm.
The other one is 10.5mm diameter and is really going to push it diameter wise. One has to be very careful to place the battery so it won't touch anything else. The height is a problem at 8.5mm. That's not going to fit.
Found some EDLC381420-501-2F-70 which could be taped or glued somewhere. These are way more expensive, but in stock for me and still better than shelling out $370 bucks.

Edit: Turns out DSK-3R3H224U-HL is back in stock @ Digikey on July 4th, 2022. Worth while waiting since it is only a couple of weeks until the new shipment arrives.

[AleXis6]

Re: Fluke 289 bad supercapacitor replacement repair

ELNA DSK-3R3H224U-HL

but based on your experience it last just 4 years. may be 1 of the reason that voltage is to high for this supercapacitor.
I will buy Panasonic EECS0HD334H 0,33F 5.5V it bigger, but based onother forum it is ok by size.

[AleXis6]

Re: Fluke 289 bad supercapacitor replacement repair

I have found a simple approach how to calculate the capacitance.
Charge the supercapacitor through a 1kOhm resistor and measure the time in seconds when the U on the supercapacitor is 0.6331 of the load voltage.
Then multiply the number of seconds by 1000 -> mF
Load 3.0V -> 0.6331*3 = 1.8993V
After 255 seconds the U on the supercapacitor has become 1.8993V, so the capacity is about 255*1000=0.255F this is 23% lower than the nominal I bought 0.33F (+-30%)

[CapLeaker]

Re: Fluke 289 bad supercapacitor replacement repair

but based on your experience it last just 4 years. may be 1 of the reason that voltage is to high for this supercapacitor.
I will buy Panasonic EECS0HD334H 0,33F 5.5V it bigger, but based onother forum it is ok by size.

I looked at those and they aren't available for me. Meanwhile I needed to do up an order and today they pushed the date back 2 months. Hmm... back to square one.

[AleXis6]

Re: Fluke 289 bad supercapacitor replacement repair

Panasonic EECS0HD334H 0,33F 5.5V it bigger.

The diameter is close to the maximum possible.
The height is normal and might be even greater.
negative leg has been cut.
But the current consumption has increased in sleep mode from about 10 μA to 60 μA (my another multimeter is not very accurate in this mode).
Also I performed a test before soldering- charge the supercapacitor to 3.0V and keep it for 24 hours, the voltage after that was 2,24V.
I found similar supercapacitor with vertical legs in my stock :-) the voltage after 24 hours was very close to the first one

[CapLeaker]

Re: Fluke 289 bad supercapacitor replacement repair

Yeah... I figured that out too that 10.5mm diameter is the biggest that fits in there.
Panasonic EECS0HD334H has been discontinued long time ago. I came up with a Eaton KR-5R5H474-R. However the diameter is 11.5mm.
You can squeeze this in too with wires: TDK EDLC371420-501-2F-50
Anyway... I guess I have to wait until the ELNA DSK-3R3H224U-HL are back in stock in September. Ugh!

[willinsau]

Re: Fluke 289 bad supercapacitor replacement repair

waiting for the responses

[CapLeaker]

Re: Fluke 289 bad supercapacitor replacement repair

I did order some different supercaps than those that are mentioned in this thread a week ago, but haven’t come in yet. I will update this thread again once I installed them.

[CapLeaker]

Re: Fluke 289 bad supercapacitor replacement repair

I replaced that ELNA DSK-3R3H224U-HL with a KEMET FC0V474ZFTBR24 from Mouser. This new cap is much bigger than the old one, but SMD, 3.5V, 0.47F.
The corners on the cap need to be cut and that plastic lid that sits over the board needs to be drilled.

IF you put the unit back together and you can't select anything on DMM and just has a strange behaviour with nothing on the display, the supercap is jammed and shorted out against a different part, guaranteed. Hence the not getting around the drilling part in my case.

Here is more FLUKE porn for your entertainment.

[sam_sam_sam]

Re: Fluke 289 bad supercapacitor replacement repair

I replaced that ELNA DSK-3R3H224U-HL with a KEMET FC0V474ZFTBR24 from Mouser. This new cap is much bigger than the old one, but SMD, 3.5V, 0.47F.
The corners on the cap need to be cut and that plastic lid that sits over the board needs to be drilled.

IF you put the unit back together and you can't select anything on DMM and just has a strange behaviour with nothing on the display, the supercap is jammed and shorted out against a different part, guaranteed. Hence the not getting around the drilling part in my case.

Here is more FLUKE porn for your entertainment.

Did you get the meter to work correctly with the super capacitor or did you have to do something else

[CapLeaker]

Re: Fluke 289 bad supercapacitor replacement repair

Mine worked fine as kind. However I did read about someone having —— (dashes) in the display. Sure enough if I short the cap out to the nearby SMD pieces and turn it on, I get dashes too in my display. So if someone does get the dashes, recheck the work.

All I did was cut the plastic on the negative side of the supercap to make it fit, take out old supercap, put in new supercap, marked the spot on the cover plastic, drilled a 1/2” hole and screwed the thing back together. Then I verified that all works. The second Fluke 289 got modded exactly the same way and also have success to report. Now we have to wait a few years to see how these new larger supercaps make out over time.

[stj]

Re: Fluke 289 bad supercapacitor replacement repair

the kemet is rated for 1000hours at 70'
thats why supercaps are shit!

[CapLeaker]

Re: Fluke 289 bad supercapacitor replacement repair

There should be something like a battery holder for supercaps, so one can change them as needed. Lol

[stj]

Re: Fluke 289 bad supercapacitor replacement repair

i should start a business selling keyfob flashlights globally - you choose the battery inside it!!!!

[sam_sam_sam]

Re: Fluke 289 bad supercapacitor replacement repair

There should be something like a battery holder for supercaps, so one can change them as needed. Lol

I personally wish that they would do this as well

[rporonga]

Re: Fluke 289 bad supercapacitor replacement repair

I just got my Fluke 289 come back from warranty service. I initially had the supercapacitor replaced under warranty 5 years ago, and it recently failed again. This time around, they replaced the PCA.
Is there a way to check the board version without disassembling it?

[CapLeaker]

Re: Fluke 289 bad supercapacitor replacement repair

I don’t think so. Unless there is a very big change. That’s why there are 2 different firmwares. One for the old version and another one for the new version.

[AleXis6]

Re: Fluke 289 bad supercapacitor replacement repair

who tested after what minimum voltage on the capacitor Fluke lost date and time settings?
1 year ago I replaced the capacitor and yesterday was surprised that after 6 hours date&time settings was lost. Now I measure the minutes/voltage but I have no idea what is the minimum required voltage

[AleXis6]

Re: Fluke 289 bad supercapacitor replacement repair

quick measurement - voltage of the supercapacitor (Panasonic) in FLUKE 289
HH:MM V
00:00 - 3,223
00:08 - 3,207
00:22 - 3,14
01:00 - 2,973
01:32 - 2,833
02:00 - 2,715
02:31 - 2,593
03:00 - 2,484
03:20 - 2,406
Date &time have been saved after 210 minutes
after about 360-400 minutes Date&time was lost
The minimum required voltage I think in a range 2-2.4 V