Lab - Report
Course Name : Electronic Device and Circuits Lab
Course Code : EEE12P4
Experiment No. : 02
Experiment Name : Observation of characteristics of a Zener
diode.
Submitted to:
Submitted by:
Nasrin Akter
ID No :
Student of Computer Science & Engineering
(1st year & 2nd Semester)
, Name of the experiment: Observation of characteristics of a Zener
diode.
Objectives
In this experiment, we try to observe the relation between the voltage and
corresponding current generated. We will then plot it to get the dependence.
2. Apparatus required
a) A Zener diode
b) A DC voltage supplier
c) Bread board / trainer board
d) 1kΩ resistor
e) 2 millimeter for measuring current and voltage
f) Connecting wires
3. Theory of experiment
A Zener Diode is constructed for operation in the reverse breakdown region. The
relation between I-V is almost linear in this case Vz= Vzo +Iz. rz, where rzis the
dynamic resistance of the zener at the operating point. Vz 0 is the voltage at which
the straight-line approximation of the I-V. characteristic intersects the horizontal axis.
After reaching a certain voltage, called the breakdown voltage, the current increases
widely even for a small change in voltage. However, there is no appreciable change
in voltage. So, when we plot the graph, we should get a curve very near to x-axis
and almost parallel to it for quite some time. After the Zener potential Vz there will be
a sudden change and the graph will become exponential.
Fig (a). V-I characteristics for Zener Diode.
Course Name : Electronic Device and Circuits Lab
Course Code : EEE12P4
Experiment No. : 02
Experiment Name : Observation of characteristics of a Zener
diode.
Submitted to:
Submitted by:
Nasrin Akter
ID No :
Student of Computer Science & Engineering
(1st year & 2nd Semester)
, Name of the experiment: Observation of characteristics of a Zener
diode.
Objectives
In this experiment, we try to observe the relation between the voltage and
corresponding current generated. We will then plot it to get the dependence.
2. Apparatus required
a) A Zener diode
b) A DC voltage supplier
c) Bread board / trainer board
d) 1kΩ resistor
e) 2 millimeter for measuring current and voltage
f) Connecting wires
3. Theory of experiment
A Zener Diode is constructed for operation in the reverse breakdown region. The
relation between I-V is almost linear in this case Vz= Vzo +Iz. rz, where rzis the
dynamic resistance of the zener at the operating point. Vz 0 is the voltage at which
the straight-line approximation of the I-V. characteristic intersects the horizontal axis.
After reaching a certain voltage, called the breakdown voltage, the current increases
widely even for a small change in voltage. However, there is no appreciable change
in voltage. So, when we plot the graph, we should get a curve very near to x-axis
and almost parallel to it for quite some time. After the Zener potential Vz there will be
a sudden change and the graph will become exponential.
Fig (a). V-I characteristics for Zener Diode.
