![]() Zener Voltages (V Z) of around -2.5V are common, whereas conventional diodes often have a breakdown voltage (V B) of -50V to -100V. There are two major differences between regular diodes and Zener diodes:įirst, the Zener voltage (V Z) of a Zener diode is much smaller than the breakdown voltage (V B) of a conventional diode. You may recall that regular diodes also allow current to flow when a large enough reverse bias, called the breakdown voltage (V B), is applied. However, unlike other diodes, they are also designed to allow current to flow when negatively biased. Like other diodes, they are essentially P-N junctions and allow current to flow while they are forward biased. Zener diodes are a special type of diode. Effect of Temperature on Zener Diodes What Are Zener Diodes?.Identifying the Anode and Cathode of a Zener Diode.Capacitor Charge, Discharge and RC Time Constant Calculator.Metal Oxide Semiconductor Field Effect Transistors (MOSFETs).Capacitors and Capacitor Circuits Menu Toggle.Resistors and Resistor Circuits Menu Toggle.Introduction to DC Circuits Menu Toggle.Module 2: Fundamental Concepts Menu Toggle.Module 1: Introduction to Electrical Theory Menu Toggle.Reference: Digital Multimeter Principles by Glen A. For best results when using the Resistance mode to test diodes, compare the readings taken with a known good diode.Connect the test leads to the diode after it has been removed from the circuit.It may share a space on the dial with another function. The resistance mode procedure is conducted as follows: The diode is bad if readings are the same in both directions. The reverse-biased resistance of a good diode displays OL on a multimeter.The resistance measurement is high when the diode is forward-biased because current from the multimeter flows through the diode, causing the high-resistance measurement required for testing.Ī diode is reverse-biased when the positive (red) test lead is on the cathode and the negative (black) test lead is on the anode.The forward-biased resistance of a good diode should range from 1000 Ω to 10 MΩ.A shorted diode has the same voltage drop reading (approximately 0.4 V) in both directions.Ī multimeter set to the Resistance mode (Ω) can be used as an additional diode test or, as mentioned previously, if a multimeter does not include the Diode Test mode.Ī diode is forward-biased when the positive (red) test lead is on the anode and the negative (black) test lead is on the cathode.A multimeter will display OL in both directions when the diode is opened. A bad (opened) diode does not allow current to flow in either direction.The OL reading indicates the diode is functioning as an open switch. The multimeter displays OL when a good diode is reverse-biased.Some germanium diodes have a voltage drop ranging from 0.2 to 0.3 V. A good forward-based diode displays a voltage drop ranging from 0.5 to 0.8 volts for the most commonly used silicon diodes. ![]()
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