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Old 08-18-2021, 02:58 AM   #21
stj
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Default Re: Fluke 289 bad supercapacitor replacement repair

maybe you could do the upgrade to a lithium rechargeable and a current limit resistor?
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Old 08-18-2021, 06:10 AM   #22
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Default Re: Fluke 289 bad supercapacitor replacement repair

wouldn't that charge the lithium permanently, even with the current limiter resistor... unless the resistance is very high? Educate me!
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Old 08-18-2021, 08:23 AM   #23
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Default Re: Fluke 289 bad supercapacitor replacement repair

i think it is very high.
old and new boards.
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File Type: jpg 287 Backup Cap Rev15.jpg (540.7 KB, 13 views)
File Type: jpg 289 Backup Bat Rev17.jpg (422.4 KB, 12 views)
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Old 08-19-2021, 10:10 AM   #24
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Default Re: Fluke 289 bad supercapacitor replacement repair

Interesting indeed… did anyone convert their 289 yet?
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Old 08-19-2021, 11:18 AM   #25
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Default Re: Fluke 289 bad supercapacitor replacement repair

i only know one 287 owner - he's selling or already sold it.
it's considered a bit shit compared to a unitrend 171/181 or even a fluke 80 series
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Old 08-19-2021, 06:35 PM   #26
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Default Re: Fluke 289 bad supercapacitor replacement repair

I've got a Uni-T meter... not so thrilled with it.
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Old 08-20-2021, 03:53 AM   #27
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Default Re: Fluke 289 bad supercapacitor replacement repair

they go up in quality with the price
i have a potentially usefull pdf for you
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File Type: pdf panasonic_lithium-handbook-2015_interactive.pdf (8.04 MB, 11 views)
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Old 08-20-2021, 10:28 AM   #28
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Default Re: Fluke 289 bad supercapacitor replacement repair

That handbook is very interesting and thank you for it. Problem is here in Canada you can't get any of these lithium batteries. Years ago, our Government banned lithium batteries from commercial flights. So basically, if the package isn't shipped a special way (which is ridiculous in price) you plain just can't buy it. Go to Digikey Canada and see for yourself. Some outfits don't sell you certain parts, if you ship it to a Canadian address. I could order from a selected supplier in the US, but again shipping is a killer. Been there and done that. Only way to get a lithium cell for me is to go to Ali and order there, it has a mediocre success rate. I had a few shipments that never arrived.
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Old 08-20-2021, 11:17 AM   #29
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Default Re: Fluke 289 bad supercapacitor replacement repair

i think that may be wrong because these can be shipped without any charge in them - although your government isnt exactly intelligent right now!

the chinese did have a workaround for the flight-ban,
equipment with internal batteries were exempt.
so the ali sellers were shipping batteries inside obsolete tv remotes!
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Old 08-20-2021, 12:51 PM   #30
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Default Re: Fluke 289 bad supercapacitor replacement repair

Same thing here. Equipment with internal lithium batteries are exempted. Its just a real dumb law that doesn't make any sense again.
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