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EXPT.NO.3: INDUCTOR CHARACTIRISTIC AND TESTING

OBJECTIVE:

• · To test an out circuit diode with an analog multitester.
• · To test an in circuit zener diode with an analog multitester.
• · To verify the volt ampere characteristic of zener diode.

REQUIRED SKILLS:

Knowledge in the proper use of multitester and familiar with the use of analog trainer (ATL-01 or equiv.) and breadboading components.

MATERIALS REQUIRED:

Description Qty.

• 360TR-model analog multitester 1
• Analog Trainer (ATL-01 or equiv.) 1
• Resistor, ¹/ ₄ W: 1kΩ 3
• Inductor: 1N4733 1

PROCEDURE:

Part 1: Out circuit testing of a zener diode

1. Test the supplied zener diode with an analog multitester following the same technique used in testing an ordinary rectifier diode as in part 1 of EXPT. NO. 15. Record the measured forward and reverse voltage current and resistance as indicated by the LV, LI and Ω scales respectively, in Table-19.1 under their respective columns.

Table 19.1: Table for step #1

Zener Diode in forward bias condition			Zener diode in reverse bias
Forward voltage VF	Forward current IF	Forward resistance RF	Reverse voltage VR	Reverse current IR	Reverse resistance RR
0	0	0	5	150mA	1k

Part 1: In circuit testing of a zener diode

2. Construct the circuit as shown in fig.19.1 and then, test the zener diode without disconnecting by using the same analog multitester and procedure as in step #1. Record the results in Table 19.2 under their respective columns.

Fig 19.1: Experimental circuit for in testing of zener diode

Table 19.2: Table for step #2

Zener Diode in forward bias condition			Zener diode in reverse bias
Forward voltage VF	Forward current IF	Forward resistance RF	Reverse voltage VR	Reverse current IR	Reverse resistance RR
0	0	0	0	0	0

Part 1: Anode to cathode volt ampere characteristic of a zener diode

3. Set the dc voltage regulator output to 10v and then, construct the circuit as shown in Fig. 19.2 with the voltage at V1 initially adjusted to zero volt.
4. Adjust the potentiometer slowly to set the voltage V1 to different levels specified in Table 19.3. Measure the anode to cathode voltage and current of the diode for each setting and record the results in the same table under their respective rows and column.

Fig 19.2: Experimental circuit for the vi characteristic of zener diode in forward bias condition

Table 19.3: Table for step #4

5. Reverse the connection of the diode in the experimental circuit of Fig. 19.2 and set the dc voltage regulator output to 15v as shown in Fig. 19.3.

Fig. 19.3: Experimental circuit for the vi characteristic of zener diode in reverse bias condition

6. Set the voltage V1 to different voltage levels, specified in Table 19.4 by slowly adjusting the 5kΩ potentiometer. Measure the anode to cathode voltage and current of the diode for each setting and record the results in the same table under their respective rows and columns.

Table 19.4: Table for step #2

7. Using your data in table 19.3 and table 19.4 plot the ampere characteristic curve of the supplied zener diode on a graph from provided in graph 19.1.

Graph 19.1: Graph for step #7, volt ampere characteristic curve of the experimental zener diode

OBSERVATION AND ANALYSIS:

CONCLUSION:

QUESTIONS:

1. Define the following terms
1. Zener diode
2. Zener knee current