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# Exp2

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### Transcript of "Exp2"

1. 1. WESLEYAN UNIVERSITY – PHILIPPINES<br />College of Technology<br />Cabanatuan City<br />NAME: MARK KEVIN A. UMAYAMDATE: 08 – 19 - 11 <br />SCHEDULE: Friday, 3:00pm – 6:00pm<br />EXPERIMENT NO. 2<br />ON or OFF Diode? – Voltage Test<br />OBJECTIVE:<br />How to determine an ON or OFF diode using the voltage test technique.<br />MATERIALS:<br />1 Variable DC source or equivalent battery supply<br />1 5.6k resistor, ½ watt<br />1 6.8k resistor, ½ watt<br />1 27k resistor, ½ watt<br />1 1N4001 diode<br />2 resistors (values assigned by instructor per group)<br />1 breadboard<br />connecting wires<br />DISCUSSION:<br />In determining whether the diode is ON or OFF by Voltage Test, assume that the diode under consideration is OFF and replace it with an open circuit. Analyze the circuit to find the anode voltage (V1) and the cathode voltage (V2). If the anode voltage (V1) is less than the cathode voltage (V2), the diode is reverse biased (Vd < 0), and your initial assumption is correct, the diode is OFF. If the anode voltage (V1) is greater than the cathode voltage (V2), the diode is forward biased and your initial assumption that the diode is OFF is wrong; the diode is ON and V1 is equal to V2.<br />PROCEDURE:<br /><ul><li>Construct the circuit in figure 1. Use the value of R given to you by your instructor for R1 and R2.
2. 2. Measure the anode voltage (V1) of the diode of figure 1 by connecting the multi-tester parallel to R2, such that positive probe is connected to point A and negative probe is connected to ground.
3. 3. Measure the cathode voltage (V2) of the diode of figure 1 by connecting the multi-tester parallel to 6.8k resistor, such that the positive probe is connected to point and the negative probe to ground.
4. 4. Measure the diode voltage of figure 1 by connecting the multi-tester parallel to the diode, such that the positive probe of multi-tester is connected to point A and the negative probe to point B.
5. 5. Repeat procedures 1, 2, 3 and 4 using figure 2.</li></ul>DATA AND OBSERVATION:<br /><ul><li>Record the measured anode voltage for figure 1 in Table 1.
6. 6. Record the measured cathode voltage for figure 1 in Table 1.
7. 7. Compare the measured anode voltage to the measured cathode voltage of figure 1.
8. 8. Which is greater? Based on the comparison, is the diode ON or OFF? Why?
9. 9. Record the measured diode of figure 1 in Table 1.
10. 10. Based on the measured diode voltage of figure 1, is the diode ON or OFF? Why?
11. 11. Record the measured anode voltage of figure 2 in Table 2.
12. 12. Record the measured cathode voltage of figure 2 in Table 1. Compare the measured anode voltage to the measured cathode voltage of figure 2, which is greater? Based on the comparison, is the diode ON or OFF? Why?
13. 13. Record the measured diode voltage of figure 2 in Table 1. Based on the measured diode voltage of figure 2, is the diode ON or OFF?
14. 14. Calculate the diode voltage of figure 1 based on the measured anode and cathode voltages of figure 1. Is the diode ON or OFF? Why? Is the calculated diode voltage equal to the measured diode voltage for figure 1? If there are differences, what accounts for the difference?
15. 15. Calculate the diode voltage of figure 2 based on the measured anode and cathode voltage of figure 2. Is the diode ON or OFF? Why? Is the calculated diode voltage equal to the measured diode voltage for figure 2? If there is a difference, what accounts for the difference?</li></ul>TABLE 1<br /><ul><li>Figure 1Figure 2V1 6 V9 VV2 6.58 VVVd - 0.58 V-0.5V</li></ul>FILL IN QUESTIONS:<br /><ul><li>By voltage test, a diode being tested is always assumed to be OFF and should be replaced
16. 16. with a/an OPEN CIRCUIT.
17. 17. If the anode voltage is less than the CATHODE the diode is OFF.
18. 18. For an ON diode. The diode voltage is equal to ZERO.
19. 19. For an OFF diode the diode voltage is LESS THAN ZERO.
20. 20. If the anode voltage is greater than the cathode voltage, the diode is ON and the diode is FORWARD BIAS.</li></ul>504080139148<br />340630516041<br /> FIGURE 1 FIGURE 2<br />CONCLUSION:<br />Base on the experiment we have done. If the diode is on (V1) anode is greater than the (V2) cathode voltage. And it depends on the resistor connecting to this and the voltage across the diode.<br />