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How to measure CTR optocouplers

Question asked by ANDREL on Aug 6, 2014
We want to measure optocouplers CTR, diode current 10mA, and then measure transistor current. For the diode current one could use the source and use the build in 5, 50, 500 or 5k to get the 10mA. But how to measure the transistor current, without building in a resitor in the fixture?