how to test optocoupler using multimeter?

crutschow

Joined Mar 14, 2008
28,156
Generally, you can't unless the transistor has the base connection available externally.
What is the optocoupler?
Does your multimeter have a transistor test option?
 

Alec_t

Joined Sep 17, 2013
12,309
Even if the base pin isn't there, you could try connecting the + and - probes of a DMM to the collector and emitter pins respectively, setting the DMM to an Ohms range, passing a small current through the opto LED and looking for a change in the meter reading.
 
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