Implementation steps

1. Turn on the power of the multimeter and go to the diode file.

Second, the red pen or black pen of the multimeter is fixed on any pin of the digital tube.

Third, the pen of another color traverses all other pins.

4. In step 3, if any of the digital tubes is lit, skip to (Step 5); if none of them are lit, skip to (Step 6).

5. If there is only one segment of light and the traversal pen is red, then it is determined that the digital tube is a common yang (while the traversal pen is black, then the digital tube is determined to be common); if there are multiple segments, the traversal pen is If it is red, it is determined that the digital tube is a common yin (when the traversal pen is black, it is determined that the digital tube is a common yang).

6. Fix the pen and traverse the pen and jump to (Step 3).

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