How to test bad AC power connection to PCB

Discussion in 'Power Electronics' started by ytesfai, Nov 22, 2016.

  1. ytesfai

    Thread Starter New Member

    Nov 22, 2016
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    On a design with a C14 AC connector soldered to PCB, is there a way to test for bad solder joints that might cause occasional intermittent connect/disconnect issues? All I've seen on web search is to use visual inspection, but I'm looking for something that uses signal integrity test using test equipment to look for bad/weak connections?
     
  2. AlbertHall

    AAC Fanatic!

    Jun 4, 2014
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    What test equipment do you have? A multimeter can test for continuity on each pin to the PCB. Wiggle the connector while the meter is connected and see if the reading changes. A limitation here is that the meter will pass only a low current through the connector. You could do better if you have a PAT tester.
     
  3. ytesfai

    Thread Starter New Member

    Nov 22, 2016
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    Thanks for the reply.

    I have basic test equipment (Multimeter, Scope) and also have a hipot tester. If necessary I'm also willing to buy a tester as long as there is a specific effective tester for this purpose. I could work around the low current issue by plugging a high load on the other side and that's what I'm planning to do, but I was trying to see if there is a reliable test specifically designed for this issue. I would think this is a fairly common problem with significant repercussions if not caught.
     
  4. AlbertHall

    AAC Fanatic!

    Jun 4, 2014
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    Try the multimeter resistance test first with a wiggle. If it shows some intermittency then the problem is found.
     
  5. #12

    Expert

    Nov 30, 2010
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    Measuring ohms with a simple ohm meter (@ 1 ma) or voltage drop caused by a constant current (10ma, 100 ma or a whole amp) are useful methods, but a full load stress test would be the gold standard because it is the same as the real life, intended use. A full load test includes temperature changes that a low current test will not provide.
     
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