Green University of Bangladesh
Faculty of Science and Engineering
Department of Electrical and Electronic Engineering
Program: B.Sc. Engg. in EEE Course Title: EEE 202
Electronics Lab Course Credit: 1.5
Laboratory Experiment Sheet
Course Teacher: Md. Atiqul Islam
EXPERIMENT NO: 02
NAME OF THE EXPERIMENT: CHARACTERISTICS OF ZENER DIODE
AIM: 1. To Obtain the Forward Bias and Reverse Bias characteristics of a Zener diode. 2. Find out the Zener Break down Voltage from the Characteristics.
APPARATUS: 1. DC REGULATED POWER SUPPLY – (each group 1) 2. ZENER DIODE – (one piece) 3. RESISTOR 1K – (one piece) 4. D.C AMMETERS – (each group 1) 5. D.C VOLT METERS – (each group 1) 6. BREAD BOARD AND CONNECTING WIRES - 1 SET
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| Bias Characteristics |
Prepared By: Md. Atiqul Islam, Lecturer, EEE 2
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| I-V characteristic of Zener Diode |
PROCEDURE:
FORWARD BIAS CHARACTERISTICS:
1. Connect the Circuit as per the Circuit Diagram on the bread board. 2. Switch on the Regulated Power Supply and slowly increase the source voltage. 3. Increase the Diode Current in steps of 2mA and note down the corresponding voltage across the Zener Diode under forward Bias condition as per table given below. 4. Take the readings until the Diode Current of 30mA. 5. Plot the graph VF versus IF on the graph Sheet in the 1st quadrant as in Fig.
REVERSE BIAS CHARACTERISTICS:
1. Connect the Circuit as per the Circuit Diagram on the bread board. 2. Switch on the Regulated Power Supply and slowly increase the source voltage. 3. Increase the Diode Current in steps of 2mA and note down the corresponding voltage across the Zener Diode under forward Bias condition as per table given below. 4. Take readings until the Diode Current is 20 mA. 5. Plot the graph VR versus IR on the graph Sheet in the 3rd quadrant of the diode. 6. Observe and note down the break down Voltage of the diode.
TABULAR FORMS:
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| Forward and Bias Table |
ZENER BREAKDOWN VOLTAGE: Draw a tangent on the reverse Bias Characteristic of the Zener Diode starting from the Knee and touching most of the points of the curve. The point where the tangent intersects the X-axis is the Zener Breakdown Voltage.
RESULT: The Characteristics of the Forward and Reverse biased Zener Diode and the Zener Break Down Voltage from the Characteristics are Observed.
Zener Breakdown Voltage = Volts.
QUESTIONS TO BE ANSWERED:
1. What is meant by Zener break down? 2. What are the different types of break downs? 3. What is the difference between Avalanche Zener break down? 4. What are the applications of Zener diode? 5. What is the difference between normal PN Junction diode and Zener diode?
Prepared By: Md. Atiqul Islam, Lecturer, EEE 3
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