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To draw the I - V characteristic curve for a Zener diode in reverse bias and hence to determine its breakdown voltage

ZENER DIODE CHARACTERISTICS


Zener diode is also known as the breakdown diode. It's been heavily doped with a silicon crystal diode designed to operate in the reverse direction. Hence it's known as the Zener diode. When the voltage across the terminals of a Zener diode is reversed, potential reaches the Zener voltage OR (Knee Voltage)

Clarence Zener, described the property concerning the breakdown of electrical insulators.





    Aim of the experiment :


    To draw the I - V characteristic curve for a Zener diode in reverse bias and hence to determine its breakdown voltage


    Apparatus required :

    1. Connecting wires
    2. Zener Diode
    3. Micro Ammeter
    4. Voltmeter
    5. Rheostat
    6. Plug Key
    7. Battery

    Principle of the experiment :


    Zener Diode is a special-purpose diode designed to work in reverse bias. At the breakdown region, the reverse voltage remains constant for a large change in current. Thus Zener diode acts as a voltage regulator.



    Circuit diagram :

    The circuit diagram for a Zener diode in reverse bias and hence to determine its breakdown voltage

    I - V characteristic curve for a Zener diode in reverse bias

    Nature of Graph :


    I - V characteristic curve for a Zener diode in reverse bias



    Procedure :

    • The circuit is constructed as shown in the diagram.
    • Rheostat is adjusted for a suitable value of voltage V. Corresponding value of I is noted.
    • Voltage is increased in small steps and each time corresponding current value is tabulated. 
    • A graph is plotted with V along the negative X - axis and I along the negative Y - axis.
    • Breakdown voltage is noted from the graph.



    Observation :

    Note down the observed values in the respective tabular column below.

    Trial No V, in (Volts) I, in (µA)
    01.
    02.
    03.
    04.
    05.
    06.
    07.
    08.
    09.
    10.
    11.
    12.
    13.
    14.
    15.

    Calculation :

    01. From the graph, breakdown voltage, OP = ................................... volts 



    Result :

    The breakdown voltage of the given diode,  = ................................... volts







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