Electronics > Beginners
How to check MOC3011 octocoupler
giosif:
Hi,
I am trying to determine if a couple of MOC3011 octocouplers I have are working or not.
What I've done in that direction was to put one multimeter in resistance or diode mode, connect its leads to pins 4 and 6, then use another multimeter in diode mode and connect its leads to pins 1 and 2 (red lead going to pin 1).
However, although I could see a voltage drop measured by the second multimeter across the IR diode integrated into MOC3011, there was no change with regards to the measurement on the first multimeter - it kept showing OL.
Am I testing this correctly?
Thanks!
wraper:
MOC3011 has 5mA typ. trigger current, what did you expect?
giosif:
My expectation was that, upon turning the IR diode on with the second multimeter, a current will be allowed to flow between pins 4 and 6, thus getting the first multimeter to register some resistance (when in resistance mode) or voltage drop (when in diode mode).
Are you saying the first multimeter needs to be able to source 5mA of current?
I need to check, but I think that shouldn't be a problem for a multimeter in resistance or diode mode.
wraper:
5mA would be very high current for multimeter.
Zero999:
If you're using the resistance setting to measure the opto-TRIAC, then the test voltage might not be high enough, since it's likely under the 600mV or so on state voltage of the TRIAC.
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