Features: 1. Test to confirm that the board under test is turned off and the electrolytic capacitors on the motherboard are fully discharged. It is strictly forbidden to test when the motherboard is powered on. 2. Confirm the optocoupler PIN1 (the pin with a small dot on the test board also has a corresponding mark 1 pin) 3. Connect the optocoupler test board to the USB power cord, and test the optocoupler with the test board probe contact point. If the light in the optocoupler test board keeps flashing, it means that the optocoupler is good (the light brightness may be different from the optocoupler). As long as it flashes, it means that the optocoupler is good) 4. Measure to for ensure that the optocoupler test board has good contact with the tested optocoupler 5. If the indicator light is always on or off, remove the optocoupler from the circuit board and insert it into the optocoupler seat of the breadboard to reconfirm the test results 6. Applicable to 4-pin optocouplers, other types of optocouplers are temporarily not applicable Specifications: Part name:Optocoupler Tester Color: green Material: PCB + electronic components Size: as shown in the figure Differentiation: 3rd generation, 4th generation, 5th generation, 6th generation Difference: 1: The interface of the 3rd generation is USB interface, no indicator light when connected to power, indicator light when testing, need to be plugged in to use 2: 4th generation is type-c interface, there is an indicator light when plugged in, need to be plugged in to use:3: 5th generation is type-c interface, there is an indicator light when plugged in, upgraded on the basis of 4th generation, four-pin plug-in optocoupler test and patch test, need to be plugged in to use 4: 6th generation is type-c interface, there is an indicator light when plugged in, four-pin plug-in optocoupler test and patch test, with flashlight lighting, with battery for charging Package Contents: 1 x Optocoupler Tester Only the above package contents, not including other products. Note: Light reflection and different monitors may cause the color of the items in the picture to be slightly different from the actual object. The allowable measurement error is +/- 1-3 cm. _x000D_ _x000D_