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Old 06-22-2022, 02:39 AM   #41
AleXis6
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Default Re: Fluke 289 bad supercapacitor replacement repair

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Originally Posted by CapLeaker View Post
After the 10 years has passed, you need the proof of purchase
I hate this kind of warranty
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Old 06-22-2022, 05:13 AM   #42
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Default Re: Fluke 289 bad supercapacitor replacement repair

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Originally Posted by AleXis6 View Post
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.

Last edited by CapLeaker; 06-22-2022 at 06:15 AM..
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Old 06-22-2022, 10:47 AM   #43
AleXis6
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Default Re: Fluke 289 bad supercapacitor replacement repair

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Originally Posted by CapLeaker View Post
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.
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Old 06-23-2022, 05:05 PM   #44
AleXis6
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Default 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%)

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Old 06-24-2022, 02:24 PM   #45
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Default Re: Fluke 289 bad supercapacitor replacement repair

Quote:
Originally Posted by AleXis6 View Post
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.
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Old 06-24-2022, 04:27 PM   #46
AleXis6
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Default Re: Fluke 289 bad supercapacitor replacement repair

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Originally Posted by AleXis6 View Post
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
Attached Images
File Type: jpg EECS0-HD334-H-0-33-F-5-5-V.jpg (253.9 KB, 0 views)

Last edited by Per Hansson; 06-25-2022 at 12:52 AM.. Reason: Offsite image uploaded
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Old 06-24-2022, 05:36 PM   #47
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Default 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!
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