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 marked with a small dot on the test board also has a corresponding pin 1)
3. Connect the optocoupler test board to the USB power cable and test the optocoupler with the test board probe point. If the indicator light in the optocoupler test board continues to flash, it means that the optocoupler is good (the brightness of the indicator light may be different from the optocoupler itself). (As long as the indicator light flashes, it means that the optocoupler is good)
4. Measure to for ensure that the optocoupler test board has good with the optocoupler under test.
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 confirm the test results again.

Specifications:
Part name: Optocoupler tester
Color: blue, green
Material: PCB + electronic components
Size: as shown in the figure
Difference:
Blue version: Simple version is suitable for 817, 781 and other 4-pin common optocouplers
Purple version: Widened pins are suitable for EL101x, TCLT100x and other patch extended optocouplers
New generation: The new generation of optocoupler test tools adds two test positions on the basis of the old version to support various sizes of four-corner patch optocouplers

Package contents:
A: 1 x Optocoupler Tester - Blue Version
B: 1 x Optocoupler Tester - Purple Version
C: 1 x Optocoupler Tester - New Generation

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