Products > Test Equipment

FLUKE 189 DC reading problem [with video]

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kamcm:

--- Quote from: joeqsmith on July 14, 2019, 11:52:18 am ---Not sure why you would pull the MOVs but now that they are out, just repeat your low voltage test.   From your video, it appears to be a mechanical problem.

--- End quote ---

You're right. Still getting the same problem with MOV removed.
Do you have any suggestions? which parts are likely having problems?

Thanks!

joeqsmith:
From your video, doersn't it appear to be in the switch area to you?  I am not sure why you would think this is a component problem.  It could be a solder fracture but I wouldn't start reflowing everything like I see some idiots do. 

kamcm:

--- Quote from: joeqsmith on July 14, 2019, 03:54:26 pm ---From your video, doersn't it appear to be in the switch area to you?  I am not sure why you would think this is a component problem.  It could be a solder fracture but I wouldn't start reflowing everything like I see some idiots do.

--- End quote ---

It's because solder fracture will not lead to the input resistance drop down from 10M ohm to 8.38 M ohm (in #3).
It's more likely some components leaking current to the GND and causing this happened. That's why I decided to give it a try and de-solder the MOV.

joeqsmith:
Your video shows it very intermittent.   This is not typical of a component failure.  Not sure why you would think that a fracture could not cause this symptom.  Looking at your video, it seems like the problem is in the switch area. 

CDaniel:
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 ?

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