How to Check 4-Pin Optocoupler in Multimeter?

   v Connect the Multimeter (+)Red Lead Optocoupler 1 no pin and (-) Black Lead optocoupler 2 no pin Some value Show (400-850mV).These Pin Is Good Position. That means The OptoCoupler Is Good Position .But No show Value these Pin Is bad Position.That means The OptoCoupler Is bad Position

v Connect the Multimeter (-) Black Lead Optocoupler 1 no pin and (+)Red Lead optocoupler 2 no pin value Show. That means The OptoCoupler Is bad Position.But No show Value these Pin Is Good Position.That means The OptoCoupler Is Good Position

v Connect the Multimeter (+)Red Lead Optocoupler 3 no pin and (-) Black Lead optocoupler 4 no pin value Show .These Pin Is bad Position. That means The OptoCoupler Is bad Position .But No show Value these Pin Is good Position.That means The OptoCoupler Is good Position