हिंदी ZENER DIODE CHARACTERISTICS EXPERIMENT 2018 - Duration: 6:58. Experiment 8 . Zener Diode. Connections can be made as seen in the circuit diagram by clicking and dragging the mouse from one connecting terminal to the other connecting terminal of the devices to be connected. Take the readings and note Voltmeter reading across Zener diode and Ammeter reading. Jrd . A standard 10 V Zener may have a temperature coefficient of +0.07%/ °C which may correspond to 7 mV/ °C variation in temperature. While doing the experiment do not exceed the readings of the diode. zener diode. For correct voltage regulation, we need to find out precisely what voltage should be across the Zener diode.Zener breakdown voltage should be approximately close to the desired voltage we want. Apparatus A Zener diode (with small reverse breakdown voltage of about 6 volts), [i.e., V z = 6 V], a ten volt battery, a high resistance rheostat, two 0-10 V voltmeter, one 0-100 mA ammeter, one 20 Ω. resistance, one way key, connecting wires. We use Zener diodes for voltage regulation and voltage stabilisation. APPARATUS:- PROCEDURE: FORWARD BIAS CHARACTERISTICS 1. Connect the Circuit as per the Circuit Diagram on the bread board. 4. Zener diodes are semiconductor PN junction diodes with controlled reverse-bias properties, which make them extremely useful as voltage references. Plot the reverse characteristic curve by taking reverse voltage along –ve X-axis and reverse current along –ve Y-axis. Characteristics of Zener Diode. The experiment is continued till the milliammeter shows a large deflection while the voltmeter reading remains a constant, indicating the break down voltage. Add a 9V zener diode in parallel with the - kΩ load resistance in Figure 9 and repeat the 2-measurements in step 7. 9. A typical Zener diode shunt regulator is shown in Figure 3. To redo the experiment, click on the ‘Reset’ button. Connect the Circuit as per the Circuit Diagram on the bread board. Answer: c Explanation: Zener diodes are used as voltage regulators but they aren’t called voltage regulators. Ans: A voltage regulator is an electronic circuit that provides a stable dc voltage independent of the load current, temperature and ac line voltage variations. 1. Ohms (!'fax. ) The maximum reverse current is limited, however, by the wattage rating of the diode. To see the graph, click on the graph icon in the worksheet. The forward bias characteristic of Zener diode is same as the normal PN junction diode but in reverse bias it has different characteristic. As the applied reverse voltage increases the minority carriers acquire sufficient energy to collide with the carriers in the covalent bonds inside the depletion region. Objectives: To study the characteristics of Zener diode. To find Zener break down voltage in reverse biased condition. The reverse leakage current has been exaggerated to make it show on the graph. Here V z is the Zener breakdown voltage. This is a simple test we can do to check whether it is good, open, or shorted. The zener regulator is composed of resistor R1 and zener diode CR1• The resistor characteristics … Tag : zener diode as voltage regulator experiment readings Zener Diode Voltage Regulators Zener Diodes can be used to produce a stabilised voltage output with low ripple under varying load current conditions. We are going to learn about an experiment to find out the Zener breakdown voltage and draw the characteristics of Zener diode. Ans:Zener diode is generally used in Reverse biased condition.When zener diode is forward biased,it acts as a normal P-N junction diode. So we take the ohmmeter and place it across the leads of the diode. Ans: The forward voltage at which the current through the junction starts increasing rapidly, is called the knee voltage or cut-in voltage. Plot the reverse characteristic curve by taking reverse voltage along –ve X-axis and reverse current along –ve Y-axis. This is an individual effort but members of a team can and should share insight, confirm results, and help problem solve. Zener Diode Characteristics. The graph below shows the current/voltage characteristics of a Zener diode. Calculate static and dynamic resistance of the Zener diode in both forward and reverse biased conditions (before, after break down voltages). This breakdown voltage is known as the Zener voltage. To draw the characteristic curve of a zener diode and to determine its reverse break down voltage. In the reverse bias direction, there is practically no reverse current flow until the breakdown voltage is reached. 7-9 4. While doing the experiment do not exceed the ratings of the diode. Give the input as triangular voltage waveform from Function Generator (both positive and negative peaks). current increases at a rapid rate. The resistor is selected so that when the input voltage is at VIN(min) and the load current is at IL(max) that the current through the Zener diode is at least Iz(min). 3 Theory of experiment The diode is a device formed from a junction of n-type and p-type ... We have to take many readings till the input voltage is 2. about 30V. I-V Characteristics of Zener Diode Aim:- To study of the I-V characteristics of zener diode in Forward bias and Reverse bias conditions. Tabulate different reverse currents obtained for different reverse voltages. 10-1 2 5. Zener diode observation tablein hindi 3. As a result, the bond breaks and electron hole pairs are generated. calculate static and dynamic resistance in both forward and reverse bias condition. In Experiment A, a 12V zener diode is connected in reversed biased as shown in the image and it can be seen that the zener diode blocked the voltage effectively because it was less/equal to the breakdown voltage of the particular zener diode and the lamp thus stayed off. Zener diodes are also known as a) Voltage regulators b) Forward bias diode c) Breakdown diode d) None of the mentioned. The voltage across the zener will remain steady at its break down voltage VZ for all the values of zener current IZ as long as the current remains in the break down region. In the reverse biased mode zener diode has large breakdown voltage and though the current increases the voltage remains constant. VDC +2 . From the plot at which point of voltage the spike in current is noticed that voltage value is referred to as Zener … There is a controlled breakdown which does not damage the diode when a reverse current above the Zener voltage passes through a Zener diode. 7.5 . analyze the working of Zener diode as a voltage regulator for line regulation and load regulation. Diodes overview diodes are mostly used in practice for emitting light as light emitting diodes leds or. ELE 213 - Electronics Page 1 of 5 Lab #2 Experiment procedure A. Bridge Rectifier Circuit 1. To Study the V-I characteristics of Forwa rd Biased PN junction diode. It is generally 0.6v for a  Silicon diode. For Zener diodes, silicon is preferred to Ge because of its high temperature and current capability. 18. Unlike ordinary PN junction diode, the reverse current in Zener diode is measured using milli-ammeter due to the large flow of current. (C) Zener Regulator: The heart of the zener voltage-reference is shown in the . It permits current to flow in the forward direction as normal, but will also allow it to flow in the reverse direction when the voltage is above a certain value - the breakdown voltage known as the Zener voltage. When the reverse bias voltage is greater than a predetermined voltage then the Zener … In the forward biased mode the zener diode operates as a p-n diode. Zener diodes are a special kind of diode which permits current to flow in the forward direction. Ans: The breakdown voltage of a diode is the minimum reverse voltage to make the diode conduct in reverse. To do this, rectify an AC voltage with a rectifier diode and slightly pre-smooth it with a charging capacitor. BJT Characteristics (CE Configuration) Part A: Input Characteristics Part B: Output Characteristics 5. Sl No Name of Experiment Page No 1. Then we will see how that experiment can be performed using the PSLab Android App and the PSLab Hardware Device. Viva questions: 1. In ‘on’ state , the voltage across zener diode remains constant until the voltage across it deops less than VZ . The typical forward voltage at room temperature with a current of around 1 mA is around 0.6 volts. It is a semiconductor diode, in which the n-type and the p-type sections are heavily doped, i.e., they have more percentage of impurity atoms. Shunt regulators have an inherent current limiting advantage under load fault conditions because the series resistor limits excess current. The break down voltage Vz is obtained from the graph as shown below. APPARATUS:- PROCEDURE: FORWARD BIAS CHARACTERISTICS 1. Connect the CRO CH1 across the input and CH2 across resistor. Zener Diode Characteristics. 1. Because of technological limitations, the "ceramic" capacitors that you have been using up to now do not have sufficiently high capacitance to be used in this application. This may lead to ... ZENER DIODE CHARACTERISTICS AIM: 1. Connections are made as shown in the circuit diagram. Ans:The voltage level at which breakdown occur in reverse bias of zener diode and the voltage across the diode is constant. Observe the nearly constant voltage in the breakdown region. The breakdown voltage is specified as a voltage with a tolerance, such as 10 volts ±5%, which means the breakdown voltage (or operating voltage) will be between 9.5 volts and 10.5 volts. Apparatus:-Experimental kit and patch cords. 19. You can use the embedded worksheet to enter the values. 17. Forward characteristics are similar to both, although the zener's forward characteristics is usually not specified, as the zener will never be used in that region. Ans:Zener breakdown due to change in high electric field intensity,where Avalanche breakdown due to ionization in electronand hole pairs. The experiment is continued till the milliammeter shows a large deflection while the voltmeter reading remains a constant, indicating the break down voltage. 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