Products > Test Equipment
Fluke 189 with leaking surface mount supercap (also Fluke 287, Fluke 289)
dr.diesel:
My 289's cap was completely shorted. I'd kinda been wondering why new batteries only lasted 2-3 days before going ka-put :-//, however not enough to actually spend the time tearing it down! I've modified mine with a 2.1mm DC jack, it's been powered by a power supply for years sitting on the bench.
Just ordered a new cap from Digikey for $2.50, for 5 minutes of down time I'll be back in business!
M. AndrĂ¡s:
i know what the warranty states but what is that damn component falls under?
alm:
--- Quote from: dr.diesel on November 06, 2013, 08:29:31 pm ---I've modified mine with a 2.1mm DC jack, it's been powered by a power supply for years sitting on the bench.
Just ordered a new cap from Digikey for $2.50, for 5 minutes of down time I'll be back in business!
--- End quote ---
Just note that this defeats most of the meter's protection circuit unless the barrel plug, lead and power supply offer the same isolation as the DMM. If you connect the common lead to mains, the barrel connector and power supply will probably also be at mains potential, something common DC barrel connectors and wiring are not designed to protect from. Not a big deal for separated extra-low voltage (eg. Arduino) circuits, as long as your aware and clearly indicate on the meter that the CAT IV 600 V (or even a CAT I 300 V) rating no longer applies.
dr.diesel:
Wait a minute, there's life above 3.3v? :scared:
All kidding aside, absolutely, this is on my personal bench, otherwise I wouldn't allow it.
alm:
Some voltage references go all the way up to 7V! But fair enough, you have to get really creative to get shocked by low voltage DC. I would probably affix a label to the front notifying anyone picking it up of the mod, but I can certainly see the convenience of a wall-powered 289.
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