| Products > Test Equipment |
| Fluke 189 with leaking surface mount supercap (also Fluke 287, Fluke 289) |
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| Daruosha:
--- Quote from: bayati on January 05, 2019, 07:01:29 pm ---Hi I'm sorry to bringing up an old thread and I know it has been talked a lot about this issue but please bear with me because I'm seriously confused. I have 2 fluke 289. both have corroded cap and they can't hold the time when the battery is removed. I measured it's consumption right after installing the batteries. It draws 10 mA at first but after 1 min it stops at 20-30 uA (I think it charges the cap). Both working perfectly and I don't have any problems in measurements and I think battery consumptions are normal. Note: I can't send them to Fluke -- Now my questions: 1. Two people mentioned that after removing the cap their meters broke. How common is that? It can be related to other issues not removing cap? 2. Many substitute caps mentioned. 0.1F 3.3v, 0.22F 5.5v, 0.33F 5.5v? In super caps using higher capacity is dangerous or higher voltage? 3. The meter's firmware is 1.12. Is it better to change the super cap after updating to 1.16 or before that? 4. Should I wait for the cap to get discharged completely then removing them or it does not matter? 5. This question may look absurd but one person mentioned just using hot air to change the cap, not soldering iron?!!! but he did not mentioned why! (I think using soldering iron is better because using hot air, I thing it messes up the calibration) 6. The meters are calibrated in 2011. I don't care about the date but I'm worried that the battery corrosion expands or shorts. what do you thing? should change it? Thank you in advance. --- End quote --- 1- Removing the caps wouldn't do any harm. Fluke themselves confirmed the purpose of that cap is to keep the clock. 2- Higher caps ratings are OK (except in high ripple filtering where ESR is important) 3- Firmware version doesn't matter. 4- If the corrosion process has been started, remove the cap ASAP. 5- Removing an SMD cap can be done in many many ways. Just do it the way it suites you and you feel comfortable enough to do it. If you do it properly with small enough air nozzles, hot air wouldn't do any damage and drift. 6- Yes, Change them. |
| sotos:
I’m one of the guys that after removing the capacitor the meter refused to boot. I sent it to Fluke and they changed the capacitor and repaired the meter free of charge but I had to wait 1 month as I remember. PS. I repair pcbs for a living and know how to solder and desolder through hole and smd components. |
| coromonadalix:
@sotos Errors can happen to experimented techs, an sudden discharge at the wrong place, bad manipulation etc ... Glad Fluke repaired it, sad they haven't issued a official recall for this supercap, "they" know its a problem for a long time. I used Panasonic eec-s0hd334h pn: p11064-nd at Digikey But they are being phased out ... i have 3 left in case ... |
| bayati:
Fluke has a big unofficial market in Iran (just like apple) but no official service. I think i should take a risk and do it. I try to discharge the super cap with a resistor before removing it. wish me luck :-/O |
| sotos:
When you remove the capacitor don’t try to turn it on to see if it can work without the cap. I suggest you remove it put a new one in and then turn it on. I did this to mine and didn’t boot, I tried it without the cap. Maybe it doesn’t like it. |
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