Products > Test Equipment
Fluke 189 with leaking surface mount supercap (also Fluke 287, Fluke 289)
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rauldm:
Ok, fluke eliminates the capacitor 145 on new board? How solves the problem? New firmware has it improves?
mr.fabe:
I don't know what is on the new board but was told by Fluke that the supercap problem is not an issue.  I have no reason to doubt Fluke and if there were a problem with losing the date/time then it would be covered under warranty.  The supercap problem is a few years old and Fluke mentions that they were going to make changes on future revisions of the 287/289.
rauldm:
I talked with Fluke support about this capacitor, I attached datasheet of capacitor.  In datasheet it comes this:
1.- Re-flow soldering method available (250 °C)
Note : 1. When the capacitor is being used in a high temperature and high humidity environment for a long period, brown deposited
materials might be found around the sealing area. However, the materials are insulators and will not affect any electrical
characteristics of the capacitor.
2. Do not use refl ow soldering when cell voltage is above 0.3 V.

Really I dont know is or not recomendable an user change this capacitor, I think a meter is a tool in that you trust your life, if you don't doing the procedure correctly perhaps will not be trustworthy again.
CDaniel:
The model 187 doesn't have that supercap fitted ... so it is just for not losing the logging data when the batteries are consumed . A user that doesn't do logging every day could use the meter ( at least 189 ) very well with that cap just removed if it goes bad .
BravoV:

--- Quote from: rauldm on September 18, 2019, 07:15:58 pm ---2. Do not use refl ow soldering when cell voltage is above 0.3 V.

--- End quote ---

Hmm ... the devil is in the details isn't it ?

I guess the manufacturers need to babysit short the cap before hand if use reflow method.  ::)

Learned something today, thanks.  :clap:
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