Zener designed to stabilize the voltage when changing the parameters of the power source or load. The principle of operation is based on a Zener breakdown of electric p-n transition upon application of a reverse voltage. To understand the principle of voltage stabilization circuit need enable zener. It consists of a series resistor and zener diode. The resistor is designed to limit the current flowing through the zener diode, and forms a voltage divider. When you change the input voltage varies the overall circuit current, and accordingly, the zener diode, and also changes the value of the voltage drop across a current limiting resistor at the voltage at the terminals of the zener diode and thus the load remains practically unchanged. CVC zener diode (IV curve), as well as diode, has two branches. Only the diode is a direct branch of labor, and for the zener diode - reverse branch. It is practically parallel to the axis of the reverse currents. Made also SMD zener. They come in a glass case in plastic with three solder. Checking zener multimeter also performed as diodes. In the forward direction it carries current, and not in reverse.
Marking zener is of several types. On the housing numbers are applied to the letters or colored rings.
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