Said Zener diode test principle diagram

2016-01-20 11:10  
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Next is the Zener diode test principle diagram says. The most effective way is to grasp the principle of combining schematic view text, combined with text to understand the principle. See figure: this circuit a common transformer 230 v AC primary to 9-0-9V, 500 mA secondary for the reverse to achieve higher AC voltage 230 v AC terminals. Transistor T1 (BC547 ) is configured as an oscillator and driver to obtain required AC voltage transformer 230 v AC terminals. This AC voltage is converted to direct current through the diode D1 and the filter capacitor C2 and a Zener diode for testing. R3 as birth - es limiting resistor. The assembled circuit Check the DC voltage connection points A and B without any zener diode. Now switch S1. DC voltage - b should be different 10 v to 120 v by adjusting potmeter VR1 (10 k). If everything is correct, the circuit is ready for use. Used to test a zener diode of unknown value, connect the points a, B and the cathode to a. Adjustment potmeter VR1 for maximum DC voltage at a and B. Write down this value corresponds to the DC voltage regulator word reading multimeter. When the test is less than the value of the zener diode 3.3 v, less voltage meter display, rather than the actual value of the regulator. However, the correct reading is to get the value of Zener diode at 5.8 v and tolerance? 10%. Zener diode to prevent shorts, the multimeter shows 0 volts. The principle is simple but effective. You can read several times to grasp the principle.

Zener Diode Tester

Zener Diode Tester

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