Products > Test Equipment
FLUKE 189 DC reading problem [with video]
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 ?
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version