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Well I am trying make a diode test with my digital multimeter. When I measure with the multimeter probe (video link) , 0.401 volts seen in one direction, If I change the location of the probes, it's increasing to 1.332 volts in the other. In the 2nd video (2. video link), when I take the diode out of the circuit, my measurements seem normal. a constant volt of around 0.553 appears in one direction and OL in the other direction. I wonder why the diode test on the circuit is not working properly. Which structure connected parallel to the diode prevents me from taking a healthy measurement.

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    \$\begingroup\$ Not going to watch the videos, but any other structure in parallel with the diode that has a conductive path will affect the result, so you can (almost) never measure components while they are connected to other components. And you have the black lead in the wrong socket. \$\endgroup\$
    – Justme
    Apr 14 '20 at 12:58
  • \$\begingroup\$ you are so right i forgot \$\endgroup\$
    – mehmet
    Apr 14 '20 at 13:02

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