Method for detecting the quality of diodes:
1. Detection of ordinary diodes: (including detector diodes, rectifier diodes, damping diodes, switching diodes, and freewheeling diodes) is a semiconductor device composed of a PN structure with unidirectional conductivity characteristics. By using a multimeter to detect its forward and reverse resistance values, the electrode of the diode can be identified, and it can also be estimated whether the diode is damaged.
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2. Detection of zener diode: Connect the positive terminal of the megohmmeter to the negative terminal of the zener diode, and connect the negative terminal of the megohmmeter to the positive terminal of the zener diode. Shake the handle of the megohmmeter at a constant speed according to regulations, and monitor the voltage values at both ends of the zener diode with a multimeter (the voltage range of the multimeter should depend on the size of the stable voltage value). When the voltage indication on the multimeter is stable, This voltage value is the stable voltage value of the zener diode. If the stable voltage value of the zener diode is measured to fluctuate, it indicates that the diode is unstable.
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