Products > Test Equipment

FLUKE 107 - absolute garbage lasted 2 years

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floobydust:

--- Quote from: coppercone2 on June 30, 2024, 06:41:13 pm ---its not a vapor, its a aerosol.  [...]

--- End quote ---

Not even an aerosol - the battery's potassium hydroxide electrolyte will wick and creep via electrolysis. The ions (current flow) causes that stuff to travel, then it seems to dry out and crystalize as potassuium carbonate.
I'm saying (along with Energizer in their seal patent) that the leaks are some strange ion migration, along the case metal and then to the PCB per Murphy's Law.
Yesterday I popped open a label printer to find 6 AA leaking Duracells taking the piss, what a mess. No spray or squirt etc. KOH just travelled along the plastic compartment.

I wonder why Fluke is using bare copper vias, they could tent them at no extra cost. Western Digital has many controller boards oxidize and copper vias suffer creep corrosion, with a little help from sulphur in the air.

joeqsmith:

--- Quote from: floobydust on June 30, 2024, 05:41:44 pm ---So your tests find the 107 electrically robust and not OP's problem.

--- End quote ---

I have no idea what the problem is with the OP's meter.  I am only responding to your comments on the meter's robustness based on data I have collected for it.   



--- Quote from: floobydust on June 30, 2024, 05:41:44 pm ---The MOV's only bring the transient voltage down to 910-1,500V (hard clamp 25A). It's still too high for the silicon, so clamp zener-connected transistors or TVS are usually used for the second level protection. "high speed clamps" well there's a single BAV199 clamping to what? Compare with the 17B schematic. It's hard to speculate without a 107 schematic but eyeballs show no clamp transistors as well as missing MOV #3.  TVS D1 implies they're dumping transients to the power rails and assuming the battery helps - which is new and further economy. That's why I'm saying they could have made a mistake, have to be very careful.
--- End quote ---

Yes, that is the purpose of the  MOVs and why I mentioned  the high speed clamps that follow them when the low voltage circuits (like the resistance mode) is selected.  Again, I damaged these parts on the 107, the video shows me replacing them.   The photos you link did not show the bottom side of the board so of course they are not shown there but they certainly exist.   Their choice for the high speed clamp holds up well against my testing.  Like most of the better meters I have looked at, it saved the parts downstream from damage.   The majority of the meters I have looked at were not repairable.  Interesting enough a member here repeated the tests I performed with the 101 on an actual combo generator with the same results.   

coppercone2:

--- Quote from: floobydust on June 30, 2024, 08:05:40 pm ---
--- Quote from: coppercone2 on June 30, 2024, 06:41:13 pm ---its not a vapor, its a aerosol.  [...]

--- End quote ---

Not even an aerosol - the battery's potassium hydroxide electrolyte will wick and creep via electrolysis. The ions (current flow) causes that stuff to travel, then it seems to dry out and crystalize as potassuium carbonate.
I'm saying (along with Energizer in their seal patent) that the leaks are some strange ion migration, along the case metal and then to the PCB per Murphy's Law.
Yesterday I popped open a label printer to find 6 AA leaking Duracells taking the piss, what a mess. No spray or squirt etc. KOH just travelled along the plastic compartment.

I wonder why Fluke is using bare copper vias, they could tent them at no extra cost. Western Digital has many controller boards oxidize and copper vias suffer creep corrosion, with a little help from sulphur in the air.

--- End quote ---

its both believe me. Wear eye protection if you change a recently leaked cell. It squirt and spray. Before I heard it like a steam over pressure valve lol.

Sometimes the cell gets real hot and starts leaking. I assume its a short circuit of some kind (maybe the electrolyte is shorting it out and increasing pressure on the top)

I had one cell that burst, then every few minutes I hear a spritzer type noise for like 15 min before  I found it, and it was pretty hot too

wraper:

--- Quote from: christian.burger on June 30, 2024, 02:58:50 pm ---Yes, there was battery leakage and I've reconstructed the terminals. It's working fine other than the readings which are off, but also I don't think that is related to the problem, unless you know something specific about that.
I agree that it's most likely toast, but would like to try and use the calibration terminals just to see what I can get before I throw it away.
I could not find any reference to the WP9, WP8, WP7, WP6 calibration terminals anywhere.

--- End quote ---
There was battery leakage but sure meter suddenly started reading wrong not because electrolyte got somewhere on the PCB but because meter is garbage. Yeah, right.

stj:
i repair industrial pcb's with leaked batteries on them every week - have for decades.
it's not a spray.
and dont trust lithium AA or half-AA cells either, they eventually corrode from the inside and let hell loose on your pcb.


as for the alkaline problem, i have seen a theory that they leak now because the formula was changed for political reasons and they removed the mercury that stabilised the mix.

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