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| 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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