resistance test 817 photocouplers?

Discussion in 'General Electronics Chat' started by sdowney717, Nov 5, 2012.

  1. sdowney717

    Thread Starter Member

    Jul 18, 2012
    385
    13
    I have 3 of these I am wondering if they are bad.

    On one side
    reads same regardless of polarity
    1k
    1k
    21k

    on other side of photo coupler

    polarity reversed polarity
    5.6m ohms 5.6 m ohms
    5.6 m ohms 5.6 m ohms
    9.7 m ohms open


    These are in circuit tests.
    Thoughts?

    will PC 817 versus EL 817 work the same?
     
    Last edited: Nov 5, 2012
  2. panic mode

    Senior Member

    Oct 10, 2011
    1,320
    304
    you cannot test them like that, remove them from circuit, put them in test circuit. datasheet show how to test it
     
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