I am sorry if the title is misleading. As I am not a native speaker, I really don't know what the correct words to be used in the title. If you know the right words, please tell me so I can update the title.
My question is about a repair test named "reverse conduction test". I don't know the right name in english but its a literal translation from my idiom to english. "Reverse conduction test" is a test made by people who repair computers and smartphones' motherboard (and probably it applies to any other kind of circuit). It uses the diode mode test of a multimeter but on a different way.
These are the steps:
- take the red probe and place it on ground.
- take the black probe and place it on the pin you want to measure
This is going to give a reading on the multimeter's display. This value is then compared to a reference value. When the values differs, then probably there is an error on that pin/trace/region.
This video https://www.youtube.com/watch?v=pRpyHF2dfq0 shows someone using the diode mode to measure the values.
Here are my questions:
- what's the correct name of this test in english?
- How does it work? I don't understand how the red and black probes are inverted and still can read a voltage drop in a trace that probably contains PN junctions reversed.
- Why this test uses red and black probe swapped? Is there a a technical explanation for this?