How to measure the optocoupler?

Last Update Time: 2018-10-27 10:43:42

Because the way of the optical coupler is not the same,so the test should be based on different structures for measurement and judgment.For example,for the transistor structure optical coupler,the test transistor should be checked according to the method of test transistor.

the input and output judgment is due to the input of the light-emitting diode,and the output end is other components.So with RX 1K block,measuring the forward resistance of a pair of feet is hundreds of Europe,the reverse resistance in the tens of thousands of Europe,then the measured pin is the input terminal.The other pin is the output end.

Good or bad judgment 1 Use a multimeter to judge good or bad.The RX1KQ is used to measure the resistance of the input pin,the forward resistance is several hundred ohms,and the reverse resistance is tens of thousands of euros. Then use the multimeter RX10kQ block,in order to measure the input terminal ( launch tube ) of the two pins and the output terminal ( receiver tube ) between the pins of the resistance value should be infinite,there should be no leakage resistance between the transmitting tube and the receiving tube.Figure 9-5 shows the circuit diagram of the optical coupler,after switching on the power,the resistance of the output pin is very small.Adjust the RP,then 3,4 pin resistance changes,indicating that the device is good.2 Universal Test Circuit.Figure 9-6 shows the optical coupler test circuit,which can measure the quality of a variety of optocouplers. When the power is switched on,the LED does not emit light, press the SB,the LED will emit light,adjust the luminous intensity of the RP. LED will change,indicating that the measured optical coupler is good.

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