measuring a optocoupler

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rascabuche

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817b optocoupler

can someone tell me how to measure an optocoupler with my DMM to see if its good or bad. i have an optocoupler with 4 pins # l0514the nomber below 817b.

thanks for assistance

Ras
 

optocoupler tester

pins 1/2 are a diode so use a dmm set to diode range

pin 3/4 are a transistor so you can use a transistor tester or dmm again in diode test
however if its short here its gone if its open its usualy ok

the only real way is to build a circuit on a breadboard etc
and plug it in and pulse pin 1/2 with 5v ttl using a 220R current limiter resistor

you can use an led on pin 3/4 and +5v a pullup and load resistor {1k is ok}

here is a picture of a type of method to use
 

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    rascabuche

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