Products > Test Equipment
FLUKE 189 DC reading problem [with video]
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kamcm:

--- Quote from: CDaniel on July 14, 2019, 04:56:36 pm ---We don't know if the rest of functions work ok , just assuming from the initial post and video that the fault is only on Vdc .
Also , when is measuring OK what happens if you touch the switch , turn it just a little bit , apply pressure and so on ...  And I asked if you can use it normally when it is ok  , measuring different voltages for some time .
The big question is , you did something obvious wrong before the issue appeared ?

--- End quote ---

This problem happened on other functions as well.


In this video, you will see it jump to the correct value with a long time delay.

I think the Knob is not the root cause. I already try to apply extra pressure on the knob to test it.

The meter works perfectly before but suddenly this problem appeared.   |O


coromonadalix:
have you checked its super capacitor ?? if its rusted or has leaked ???
kamcm:

--- Quote from: coromonadalix on July 14, 2019, 07:30:47 pm ---have you checked its super capacitor ?? if its rusted or has leaked ???

--- End quote ---

It's rusted but I don't see a substantial leak.

coromonadalix:
I dont want to drag your post, but if you dont need time related logs   gently remove it to be sure,  when this puppy goes bad,  you may have excessive battery current draw or an leakage on the pcb,  removed mine on my 3 fluke 189 until i bought an substitute.

They are known to cause some problems  in the fluke 89IV - 189 and 287 or 289
windsmurf:
You might also try Mr.Modemhead's fix (full IPA cleaning of the board).
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