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Zener Diode Characteristics

The document outlines an experiment to plot the volt-ampere characteristics of a zener diode, focusing on determining the zener breakdown voltage and resistances in forward and reverse bias. It includes a list of components needed, theoretical background on zener diodes, and detailed procedures for conducting the experiment. Observations are to be recorded in tables for both forward and reverse bias conditions.

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pranesh1362006
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27 views4 pages

Zener Diode Characteristics

The document outlines an experiment to plot the volt-ampere characteristics of a zener diode, focusing on determining the zener breakdown voltage and resistances in forward and reverse bias. It includes a list of components needed, theoretical background on zener diodes, and detailed procedures for conducting the experiment. Observations are to be recorded in tables for both forward and reverse bias conditions.

Uploaded by

pranesh1362006
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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ZENER DIODE CHARACTERISTICS

AIM:
1. To plot volt-ampere characteristics of a given zener diode.
2. To find the zener breakdown voltage, forward bias resistance and reverse bias
resistances.

COMPONENTS:

S.No Name Type / Range Quantity

1 Zener Diode BZD27-6V2 1


2 Regulated Power supply (0-15V) 1
3 Resistor 1KΩ,100Ω 1
4 Ammeter (0-200mA) 1
5 Voltmeter (0-20V) 1
6 Breadboard
7 Connecting wires

THEORY:

A zener diode is heavily doped p-n junction diode, specially made to operate in the
break down region. A p-n junction diode normally does not conduct when reverse biased. But
if the reverse bias is increased, at a particular voltage it starts conducting heavily. This voltage
is called Break down Voltage. High current through the diode can permanently damage the
device. To avoid high current, we connect a resistor in series with zener diode. Once the diode
starts conducting it maintains almost constant voltage across the terminals whatever may be
the current through it, i.e., it has very low dynamic resistance. It is used in voltage regulators.
CIRCUIT DIAGRAM:
FORWARD BIAS:

REVERSE BIAS:

MODEL GRAPH:
PROCEDURE:
FORWARD BIAS:
7. Connections are made as per the circuit diagram.
8. For forward bias, the RPS +ve is connected to the anode of the diode and RPS –ve is
connected to the cathode of the diode,
9. Switch on the power supply and increase the input voltage (supply voltage) in steps.
10. Note down the corresponding forward current flowing through the diode and forward
voltage across the diode for each step of the input voltage.
11. The reading of forward voltage and current are tabulated.
12. Graph is plotted between forward voltage and current.

OBSERVATIONS:
S.No Vf (V) If (mA)
1
2
3
4
5
6
7
8
9
10

PROCEDURE:
REVERSE BIAS:
7. Connections are made as per the circuit diagram.
8. For reverse bias, the RPS +ve is connected to the cathode of the diode and RPS –ve is
connected to the anode of the diode.
9. Switch on the power supply and increase the input voltage (supply voltage) in steps.
10. Note down the corresponding reverse current flowing through the diode and reverse
voltage across the diode for each step of the input voltage.
11. The readings of reverse voltage and current are tabulated
12. Graph is plotted between reverse voltage and current.
OBSEVATIONS:
S.No Vr (V) Ir (mA)
1
2
3
4
5
6
7
8
9
10

RESULT: Forward and Reverse Bias characteristics for a zener diode are observed and the
breakdown voltage of zener diode is obtained. Breakdown voltage =

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