The detection method of voltage stabilizing diode

1. Determination of positive and negative electrodes in terms of appearance, the positive pole end of the metal encapsulated stabilized voltage diode tube body is planar, and the negative pole end is semicircle. Plastic sealed diode diode body printed with color marks on one end of the negative pole, the other end of the positive pole. The sign is not clear to the voltage stabilizer diode, also can use a multimeter to distinguish its polarity, the measurement method is the same as the ordinary diode, that is, multimeter R * 1k file, the two table pens are connected to the two electrodes of the voltage stabilizer diode, measured a result, and then adjust the two table pens for measurement. In the two measurement results, the resistance value is small that time, the black watch pen is connected to the positive pole of the voltage stabilizer diode, red watch pen is connected to the negative pole of the voltage stabilizer diode. If the positive and negative resistances of the voltage stabilizing diode are small or infinite, it indicates that the diode has been broken down or damaged.

2. The voltage value measurement with 0 ~ 30 v continuous adjustable dc power supply, the following for 13 v zener diode, regulated power supply output voltage can be tuned to 15 v, will power the positive enated 1 only 1.5 k Ω current-limiting resistance after measured zener diode connected to the cathode, and power negative into the positive electrode of zener diode, again at the ends of the zener diode voltage is measured with a multimeter, measured readings is the zener diode voltage values. If the voltage stabilizing value of the diode is higher than 15V, the voltage stabilizing power supply should be adjusted to 20V or above. A megohm meter below 1000V May also be used to provide a test power supply for a voltage stabilizing diode. The method is: will megger are end into the negative electrode of zener diode, the negative terminals of the megohmmeter and the positive phase of the zener diode, uniform turned megohmmeter handle according to regulations, at the same time the multimeter monitoring on both ends of the zener diode voltage (multimeter voltage profile should be depending on the size of the stable voltage value), directions for multimeter voltage stability, the voltage value is the stability of the zener diode voltage value. If the stable voltage value of the voltage stabilizing diode is measured, it indicates that the diode is unstable.