resistance test 817 photocouplers?

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sdowney717

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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?
 
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