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How Do You Check A Zener Diode?

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How Do You Check A Zener Diode?

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A Zener diode is a diode designed to operate in the breakdown region. Normal diodes will become destroyed, but a Zener will conduct. It may be used for voltage regulation. To check one, use a multimeter to test its voltage both in and out of circuit. A 1N4734A Zener diode has a 5.6-volt and a 1 W power rating. It supplies a stable 5.6 volts to a circuit. The maximum current Izm is approximately 1 W/ 5.6 V = 179 mA. To test if a 200-ohm limiting resistor is sufficient, use Ohm’s Law. Then the maximum zener current I is (Vin — Vout)/R = 9 V — 5.6 V/200 ohm = 17 mA. This is also within the diode’s power rating, since P = IV = 17 mA*5.6 V = 95 mW. Placing the multimeter on the diode setting. This is usually indicated by a small diode symbol on the casing. Measure the forward-biased voltage on the Zener diode. Do this by putting the positive or red lead on the anode side of the diode, which is unmarked. Place the negative or black lead on the cathode side of the diode, which is marked by

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