Zener Diode Experiment
The Zener diode mainly operates in reverse biased condition. We use Zener diodes for voltage regulation and voltage stabilisation. They provide a low-cost and no frill method for voltage regulation. The critical parameter of this type of diodes is the Zener breakdown voltage. The Zener breakdown voltage is the minimum reverse biased voltage below which the diode blocks the reverse current through it and above which it causes a significant amount of reverse bias current to flow through it. Once the reverse voltage reaches the Zener breakdown voltage, the voltage across the device remains constant at that level. Hence we can use Zener diode for voltage regulation. The graph of voltage vs current of a diode is called its characteristic. Below you can see the characteristic.
We need the following equipment:
| Voltage | Current |
Leave a Comment Cancel reply
LAB 9: THE DIODE AND DIODE CIRCUITS
To measure characteristics of a rectifier and a Zener diodes and to understand the difference between an "ideal diode" and a real device. To familiarize students with basic rectifiers and other diode circuits.
- What are the differences between characteristics of a model “ideal diode” and a real device?
- What is the difference between a Zener diode and a "standard" rectifier diode?
- Draw a “load line” plot for a circuit with a d.c. source, forward biased diode and a resistor. The plot should have the diode voltage on the horizontal axis and current on the vertical axis. Mark both scales with numerical values in volts and mA, respectively. Draw two straight load lines representing two resistors with specific values (between 1 and 10 kohms). Draw a reasonable “diode characteristic” curve on the same graph; you will measure it later in the lab. Mark two operating points corresponding to the two resistors.
Equipment needed from the stockroom: Proto-board, analog universal meter, leads.
1. MEASUREMENTS OF I-V CHARACTERISTICS OF A RECTIFIER DIODE.
a) Measure the I-V characteristic of a rectifier diode or the dependence of current through the diode on voltage across the diode . For measurements with forward diode bias you need a voltmeter and an ammeter; use the analog and the digital meters. An incandescent lamp in series with the diode makes a handy "high power" resistor. Do not burn the bulb (stop increasing current when it becomes bright)! Cover a wide range of current values, from a fraction of a mA to about 100mA. Plot the current as a function of the bias voltage. Make a preliminary graph in the laboratory. b) Apply a reverse bias to the diode of a few volts to see how large the reverse current is. Even your digital ammeter may not be able to measure a very small reverse current. Can you determine it by measuring voltage across a high value resistor (MΩ) connected in series with the diode? Think which of the two voltmeters to use in this measurement (consider their internal resistances!).
2. ZENER DIODE
Measure the I-V characteristic of a Zener diode with reverse bias. Use an appropriate series resistor (the light bulb may do it) to permit a few tens of mA of current after achieving a breakdown voltage. Make a preliminary graph in the laboratory. Plot reverse bias characteristic of the Zener diode and determine the Zener breakdown voltage.
3. A DIODE IN A CIRCUIT; THE LOAD LINE
a) Assemble the circuit shown below using the diode which characteristic you just measured. Choose the resistor in a few kohm range. Measure the voltage across it while increasing slowly the power supply voltage to obtain current of a few mA. Measure also the voltage across the circuit (V s ) and across the diode. Fig. 8.1 A diode in a circuit with a resistor
a) Repeat a) for a lower resistance (100 ohm) and in a few tens to 100 mA range. Do not exceed the power rating of the resistor (1/4 W). Make a quick calculation of the dissipated power (for example, 100 mA is too much for a 100 ohms small resistor!) Make the load line plots for the two circuits tested in a) and b), using the diode characteristic you measured in 1. Advice: Make sure that the current is in the range you covered in the measurement of the diode characteristic in section 1. If not, you may need to add a few points to the characteristic now. You will need it to prepare the load line plot.
4. DIODE CLAMP CIRCUITS
Assemble circuits shown in Fig. 8.2 and test the output voltage with an oscilloscope while supplying waveforms with different amplitudes to the input. Try a sinewave and a triangle or square wave with different dc bias. The second circuit, known as a diode limiter, is often used to protect inputs of sensitive devices, such as ammeters or high gain amplifiers. Choose R for good clipping performance. Sketch input and output waveforms. Explain how these circuits work (Experiments in 4. should help).
- Tabulate results of 1 a). Plot the I-V characteristic of the rectifier diode for forward biasing. At what forward voltage does the rectifier diode effectively conduct current? Do your measurements agree with a known theoretical equation relating diode current and voltage? Show it on a graph.
Hint: A semi-log graph may be the most informative here, plot it in addition to a standard linear graph.
- Tabulate the results of the rectifier and Zener diode measurements. Plot the I-V characteristic of the rectifier diode for forward biasing using (a) linear graph and (b) semi-log graph. Plot the Zener diode characteristic for reverse biasing using a linear graph. At what forward voltage does the rectifier diode effectively conduct current? What is the value of the Zener breakdown voltage?
- Include the load line plots for the two circuits tested in 3 a) and 3 b) using the diode characteristic you measured in 1.
- Answer all other questions printed in bold letters in this manual.
Academia.edu no longer supports Internet Explorer.
To browse Academia.edu and the wider internet faster and more securely, please take a few seconds to upgrade your browser .
Enter the email address you signed up with and we'll email you a reset link.
- We're Hiring!
- Help Center
Lab Report 2. Limiting Circuits, Zener Diode & Voltage Stabilizer
2014, Sanzhar Askaruly
The aim of the laboratory work is to understand the principle of Zener diode operation and also apply the knowledge practically by completing laboratory tasks. In this part, limiting circuit is described in Figure 1 above. The trimmer resistance is varied, so that the voltage at cathode of the D9 diode changes. Initially, it is set up to +12 V, then 0 V, and finally to -12V. Case RV4 = +12V: When the current flows from the AC input voltage (Vin = +10V) during the positive half, the D9 diode is reverse biased and the input voltage equals output voltage. During the negative half, diode is still closed. Hence, obtained pattern is provided in Figure 2.
Related Papers
International Journal of Research
Tanuj kumar
Zener diode –voltage regulator when it undergoes reversed bias and a normal diode in forward bias. Purpose to study the characteristics of zener diode
Gopalakrishnamurthy C.R
International Journal of Recent Trends in Engineering and Research
Shashidhar Kasthala
Ashok Gupta
michael nyamariva
muhd syamil
Suresh Muthusamy
RAMPRASATH EEE
Proceedings of the IEEE International Symposium on Industrial Electronics, 2005. ISIE 2005.
Clovis Petry
Loading Preview
Sorry, preview is currently unavailable. You can download the paper by clicking the button above.
RELATED PAPERS
2001 IEEE Power Engineering Society Winter Meeting. Conference Proceedings (Cat. No.01CH37194)
Haythem Rabie
Abdel-Rahman Al-Qawasmi
Mohamed Albanna
Dr. Arijit Roy
Iconic Research and Engineering Journals
IRE Journals
Shilpa Lambor
International Journal of Engineering Applied Sciences and Technology
Mahdi Murshed
bs nanotechnology
IAEME PUBLICATION
IAEME Publication
Rohan Loveland
HARISH BHATIA
International Journal of Latest Research in Engineering and Technology
IJLRET Journal
Electronics
kumars rouzbehi
rahul thakur
Sebin Davis
Arjun Gupta
IEEE Transactions on Instrumentation and Measurement
Port-Said Engineering Research Journal
Ali Alaboudy
sergio jimenez
kagisho francis
mohdfuad sarman
RELATED TOPICS
- We're Hiring!
- Help Center
- Find new research papers in:
- Health Sciences
- Earth Sciences
- Cognitive Science
- Mathematics
- Computer Science
- Academia ©2024
- Engineering & Technology
- Mechanical Engineering
Experiment No.4 Zener diode Characteristics
Related documents.
Add this document to collection(s)
You can add this document to your study collection(s)
Add this document to saved
You can add this document to your saved list
Suggest us how to improve StudyLib
(For complaints, use another form )
Input it if you want to receive answer
COMMENTS
A Zener diode. A DC voltage supplier. Bread board. 100Ω resistor. urrent and voltageConnecting wires3 Theory of experimentA Zener Diode is constructed for operation in the reverse breakdown re-gion.The relation between I-V is almost linear in this case Vz = Vz0 + Izrz , where rz is the dynamic resistance of the zener at the operating point.Vz0 ...
Fig # 02 The Zener diode is acting like a biased diode clipping circuit with the bias voltage being equal to the Zener breakdown voltage. In this circuit during the positive half of the waveform the Zener diode is. reverse biased so the waveform is clipped at the Zener voltage, VZD1. During the negative half cycle the Zener acts like a normal ...
A Zener diode operates normally in reverse-bias with a well-controlled avalanche breakdown voltage, V Z. They are available with V Z = 3V-200V. Zener diodes are a simple and inexpensive way to achieve DC voltage regulation. In this experiment you will investigate the basic properties of Si and Ge diodes. You will also inves-
The experiment is simple. First, plot the curve in reverse bias mode. Slowly increase the reverse bias voltage in small steps, noting the ammeter and voltmeter readings. There are two ammeters: A 1 with the Zener diode and A 2 with a resistance 3.3k Ω resistor. When the current in A 1 spikes, note the voltmeter reading—this is the Zener ...
Objectives: The experiments in this laboratory exercise will provide an introduction to diodes. You will use the Bit Bucket breadboarding system to build and test several DC and AC diode circuits. The objectives of this experiment include: Review basic principles of diodes from ELEC 2210. An understanding of diode rectifier circuits.
EXPERIMENT NUMBER 4 Examining the Characteristics of Diodes . Preface: • Preliminary exercises are to be done and submitted individually and turned in at the beginning of class • Laboratory hardware exercises are to be done in groups • The Lab Report is the Lab Notebook, and it can be written by any one member of the group
1. Reverse the diode in the circuit of Figure (l). 2. Measure and record in the table (2), the reverse current in the diode at each level of voltage. 3. Calculate Rz = Vz /Iz, and record the result in table (2) Procedure (C): 1. Connect the circuit of Figure (2), the output of the power supply.
Lab. Name: Electronic I Experiment no.: 5 Lab. Supervisor: Munther N. Thiyab 2 There are two mechanism which cause reverse break down of diodes, one is called the Zener effect and the other the avalanche effect both these effects are due to the large fields that are set up across the depletion layer when the diode junction is
zener diode lab report - Free download as Word Doc (.doc / .docx), PDF File (.pdf), Text File (.txt) or read online for free. This document describes an experiment using a zener diode to observe its operating characteristics and parameters. The objectives are to understand the zener diode's characteristic curve and observe its parameters. The procedures involve constructing circuits to measure ...
Lab 6, Voltage Regulation 1 EXPERIMENT 6: THE ZENER DIODE AND REGULATION Equipment List P 3 Full Wave Bridge OR 4x 1N4004 Diodes. OS BK 2120B Dual Channel Oscilloscope 100 F Electrolytic capacitor I Watt 8.2V Zener Diode R 5 Cenco 89 , 2.2 A Rheostat Leeds &R 1 Northrup #4754 AC-DC Decade Resistor Center Tap Transformer Box
Microsoft Word - Lab4. EE 462: Laboratory # 4 DC Power Supply Circuits Using Diodes. by Drs. A.V. Radun and K.D. Donohue (2/14/07) Department of Electrical and Computer Engineering University of Kentucky Lexington, KY 40506 Updated by Stephen Maloney (2/12/08) (Lab 3 report due at beginning of the period) (Pre-lab4 and Lab-4 Datasheet due at ...
Fig. 8.1 A diode in a circuit with a resistor. a) Repeat a) for a lower resistance (100 ohm) and in a few tens to 100 mA range. Do not exceed the power rating of the resistor (1/4 W). Make a quick calculation of the dissipated power (for example, 100 mA is too much for a 100 ohms small resistor!) Make the load line plots for the two circuits ...
Construct the circuit in Fig. 6.2.A. Then attach meters to measure the current through and voltage across the zener diode. Figure 6.2 Zener Characteristics Circuits with the diode A: forward biased and B: reverse biased. Take several readings of voltage versus current to determine the forward characteristic voltage Vd. Do not exceed 100 mA.
The zener diode is the diodes, which are designed to work in breakdown region. The basic function of zener diode is to maintain a speci c voltage across its terminals within given limits of line or load change 2 Experiment Set-up The Experiment Set-up included a Multisim running workstation in the lab. Figure 1: The experiment setup of NI Multisim
AI-enhanced description. awais ahmad. This document outlines an experiment to study the characteristics and voltage regulation properties of a Zener diode. The experiment involves constructing circuits using a 10V Zener diode and measuring voltages and currents across the diode and various resistors as the supply voltage is varied.
Analog Electronics Lab Report 2 Lesson 3. Limiting Circuits (With no Load) Lesson 4. Zener Diode and Voltage Stabilizer (With a variable load) Name: Lecturer: Personal Tutor: Date: Objectives Sanzhar Askaruly Alexander Ruderman Nazim Mir-Nasiri 10/10/2014 The aim of the laboratory work is to understand the principle of Zener diode operation and also apply the knowledge practically by ...
After doing the experiment, it enable the student to understand the use of Zener Diode and the uses. It also helps student to understand the behaviour of Zener Diode and how it affect the circuit by plotting the graph of the results obtained during the experiment. Appendix: Unsigned copy of a lab sheet or lab manual.
ED_Lab_Report_4_Group_01_Sec_R - Free download as PDF File (.pdf), Text File (.txt) or read online for free. 1. The lab report describes an experiment studying the characteristics of a Zener diode. A Zener diode allows current to flow in the reverse direction once the Zener or breakdown voltage is reached. 2. The students constructed Zener diode circuits and measured the voltage and current ...
Electronics Laboratory. Experiment No.4. Zener diode Characteristics. Object: To study and measure the effects of forward and reverse bias on the zener diode. current. To construct a zener voltage regulator and experimentally determine the. range over which the zener maintains a constant output voltage. Theory:
ELECTRONIC DEVICES LAB Spring 2022-LAB REPORT ON Study of Zener Diode (Lab Report-4) Supervised By DR. MD. KABIRUZZAMAN Submitted By Date of Submission: February 21, 2023 Name of the Experiment: Study of Zener Diode Abstract: A Zener diode is a diode which is used in a circuit as a voltage stabilizer. It allows current to flow int the forward
Lab Report 2 - Free download as Word Doc (.doc / .docx), PDF File (.pdf), Text File (.txt) or read online for free. This lab report describes an experiment to construct a 5V power supply using a Zener diode voltage regulator. The experiment involves observing waveforms from a full-wave bridge rectifier with and without filtering capacitors, and with the addition of a voltage regulator.
Study the voltage-current characteristics of Zener diode and 2. Observe the voltage regulation characteristics of a Zener Diode. Theory and Methodology: The basic function of Zener diode is to maintain a specific voltage across its terminals within given limits of line or load change.
A Zener diode Conducts excellently even in reverse biased condition. These diodes operate at a precise Value of voltage called break down voltage. A Zener diode when forward biased behaves like an ordinary P-N junction diode. A Zener diode when reverse biased can either undergo avalanche break down or zener break down. Avalanche break down :-