Polarity determination of crystal diodes

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Polarity determination of crystal diodes [Copy link]

1?Testing low-power crystal diodes
　　A?Distinguishing positive and negative electrodes
　　(a)?Observe the symbol on the shell. The diode shell is usually marked with the symbol of the diode. The end with the triangular arrow is the positive pole and the other end is the negative pole.
　　(b)?Observe the color dots on the shell. The shell of the point-contact diode is usually marked with polarity color dots (white or red). Generally, the end marked with the color dot is the positive pole. Some diodes are marked with color rings, and the end with the color ring is the negative pole.
　　(c) Take the measurement with the smaller resistance as the standard. The end connected to the black test lead is the positive pole, and the end connected to the red test lead is the negative pole...