Products > Test Equipment
Fluke 189 with leaking surface mount supercap (also Fluke 287, Fluke 289)
Huluvu:
--- Quote from: mjlorton on January 07, 2014, 12:43:02 am ---> The good news is the supercap is only in the unit to maintain the units date and time. It has no other purpose. It does not support instrument memory or logged /saved readings.
--- End quote ---
What about removing the supercap permanently from the Meter?
I rarely use the logging capability.
BravoV:
--- Quote from: Huluvu on January 07, 2014, 07:06:29 am ---
--- Quote from: mjlorton on January 07, 2014, 12:43:02 am ---> The good news is the supercap is only in the unit to maintain the units date and time. It has no other purpose. It does not support instrument memory or logged /saved readings.
--- End quote ---
What about removing the supercap permanently from the Meter?
I rarely use the logging capability.
--- End quote ---
Or maybe replace it with just ordinary lower capacitance cap, but good and reliable one ?
jucole:
Someone posted a link to a Panasonic datasheet with what looked like to be the same super-cap. type; in the datasheet it specified the max. current draw to be 10uA and just wondered what the draw was on the Flukes and also the operating voltage; there seem to be 2 types which look very similar ; the EN and EM types but have different properties; for example the EN has a current limit of 10uA and can be reflowed upto 250c for 5 secs according the information at the start of the document but the EM type seems like it can only be reflowed to 240c, but yet has no max. current draw specified. It's interesting to note that the specification for the EN type mentioned the reflow of 240c but that conflicts with the information at the beginning of the document.
Did someone get the EN and EM types mixed up maybe? Or maybe they reflowed the EM type to the EN temperature described at the top of the document?
Looking at Mikes DMM, with the wide tabs it looks like a Type A, but is that an EN or EM?
bernroth:
Just for the statistics: The problem is not only with the multimeters, the Fluke 1653 installation testers are affected too by this problem. I suspect the newer models 1653B/1654B using the same cap!
I recently bought two Fluke 1653 installation testers and while checking them internally I found exactly the same type of surface mount capacitors on the front panel leaking like hell. The testers are not the newest but honestly this must not happen.
I replaced them with two TH supercaps (rated 0.25F@5V) and everything is back working normal.
mjlorton:
Further feedback from Duane / Fluke:
"As a follow up to this discussion, I've attached the datasheet for the supercap. If you review Note 1 toward the bottom of the page, it makes note of "brown deposited materials found around the sealing area" and the fact that this material will not affect the electrical performance of the part. So, in essence in some situations this leakage could be found as normal under some environmental conditions. Regardless, we plan on still working with the vendor to clarify this further."
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