Identification method of Zener Diode

Identification method of Zener Diode.

1. Identify in the circuit.

Voltage regulator diodes are often represented by "ZD" plus numbers in the circuit, such as: ZD1 represents the voltage regulator diodee numbered 1.

2. Identification of positive and negative poles.

From the point of view of the shape, the positive end of the metal encapsulated Zener diode is planar and the negative end is semicircular. One end of the plastic-encapsulated Zener diode body with color marks is a negative pole, and the other end is a positive electrode. For Zener diodes whose marks are not clear, the polarity of Zener diodes can also be determined by a multimeter, which is measured in the same way as ordinary diodes.

3. Identification of color ring voltage stabilizing diode.

The color ring on the color ring Zener diode represents two meanings: one represents the number of digits, and the other represents the number of decimal places (usually the color ring Zener diode takes a decimal place and is represented by brown. It can also be understood as the multiplier: × 10 (to the power of-1), the digital homochromatic ring resistance corresponding to the specific color.

4. Distinguish from ordinary rectifier diodes.

First of all, the R × 1K block of the multimeter is used to judge the positive and negative electrodes of the tested diodee. Then set the multimeter to the R × 10K block, the black meter pen connects the negative pole of the tested diodee, and the red meter pen connects the positive pole of the tested diodee, if the reverse resistance measured at this time is much smaller than that measured with the R × 1K block, it shows that the tested diodee is a voltage stabilizer diodee; on the contrary, if the measured reverse resistance value is still very large, it means that the diodee is a rectifier diode or a detection diode.