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Homework answers / question archive / OBJECTIVES After performing this experiment, students should be able to: 1

OBJECTIVES After performing this experiment, students should be able to: 1

Electrical Engineering

OBJECTIVES

After performing this experiment, students should be able to:

1. Demonstrate how a potentiometer varies resistance

2. Construct a potentiometric circuit

3. Conduct an experiment to determine the effect of meter loading on a potentiometric circuit

EQUIPMENT AND MATERIAL LIST

1. Power supply

2. Multi meter

3. Resistors

4. Potentiometer

5. Jumper wires

*Simulation based components

PROCEDURE

1. Set the power supply to 5V. Use this input voltage for the potentiometric circuit in Figure 1 and Figure 2. This must be held constant throughout the experiment.

2. Construct the circuit according to Figure 1

3. Shift the position on the potentiometer scale until the voltage reaches zero.

4. Increase the potentiometer resistance at fixed increments of 10%.

5. Note the potentiometric circuit output voltage (to the nearest millivolt).

6. Repeat steps 4 and 5 for every 10% on the potentiometer linear input scale until 100%.

7. Repeat steps 4-6 for the same 10 readings as the percentage 1s decreased from 100% down to 0%.

8. Analyze the linearity, repeatability and hysteresis of your potentiometer based on your results.

9. Add a 10K resistor between the wiper (output voltage) and ground. This simulates a load on the sensor. See Figure 2.

10. Tabulate the data using the same method as in steps 1-7.

Voltage In

10K Pot.           V

Ground

Figure 1

Voltage In

10K Pot.                        Voltage Out

                                           10K Load

Ground

Figure 2

KEYPOINTS

Include a plot of voltage versus percentage for your potentiometer. Compute the percent linearity, repeatability, and hysteresis. Comment on your choice of a linear range. Comment on the potentiometer resolution. Discuss meter loading effect. Discuss your findings and its correlation to the theory.

Results

Table 1: Potentiometer voltage for 0% to 100%.

Percentage of input (%)

Voltage (V)

0

 

10

 

20

 

30

 

40

 

50

 

60

 

70

 

80

 

90

 

100

 

 

Table 2: Potentiometer voltage for 100% to 0%.

Percentage of input (%)

Voltage (V)

100

 

90

 

80

 

70

 

60

 

50

 

40

 

30

 

20

 

10

 

0

 

 

Table 3: Potentiometer voltage for 0% to 100% (with loading)

Percentage of input (%)

Voltage(V)

0

 

10

 

20

 

30

 

40

 

50

 

60

 

70

 

80

 

90

 

100

 

 

Table 4: Potentiometer voltage for 100% to 0% (with loading)

Percentage of input (%)

Voltage(V)

100

 

90

 

80

 

70

 

60

 

50

 

40

 

30

 

20

 

10

 

0

 

 

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