Use Dual Trace Oscilloscope to Determine A.C Voltage and Current Response in Given R, L, C Circuit.

Use Dual Trace Oscilloscope to Determine A.C Voltage and Current Response in Given R, L, C Circuit.
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Practical Significance

In the industry environment Electrical Engineering Diploma graduate are expected to handle cathode ray oscilloscope (CRO) to measure basic parameters like voltage, frequency, time period etc. of passive components. Therefore this practical will help you to acquire necessary skills.


Relevant Program Outcomes (POs)

Discipline knowledge: Apply Electrical engineering knowledge to solve broad based Electrical engineering related problems.

Experiments and practice: Plan to perform experiments and practices to use the results to solve broad-based Electrical engineering problems.

Engineering tools: Apply relevant Electrical engineering and tools with an understanding of the limitations.


Competency and Practical Skills

This practical is expected to develop the following skills for the industry identified competency ‘Maintain electrical systems applying AC and DC circuit fundamentals’:


i. Select relevant range of CRO

ii. Select suitable passive Electrical components


Relevant Course Outcome(s)

1. Troubleshoot problems related to single phase A.C series circuits.


Practical Outcome

1. Use CRO to observe phase relationship of voltage & current in prrre R, pure L & pure C circuit

2. Measure the amplitude of voltage and current by using CRO


Relevant Affective domain related Outcome(s)

1. Follow safety electrical rules for safe practices.


Minimum Theoretical Background

The phase difference or phase shift between two sinusoidal waveform having same frequency is denoted by an angle “ϕ” measured in degree or radians.


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Practical set-up / Circuit diagram / Work Situation

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Resources Required

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Precautions

1. Ensure proper earthing to the equipment.

2. Ensure the power switch is in ‘off’ condition initially.

3. Ensure that the CRO power switch is in off condition.

4. Ensure proper settings of CRO before use.

5. A two winding transformer is required for a lower input voltage and it is also desirable to isolate the circuit from the mains for this experiment. Such an isolation is not obtainable with variac.


Procedure

1. Connect the circuit as per circuit diagram.

2. Connect the CRO for observing current and voltage waveform. Channel 1 will show the current waveform and chamrel 2 will Show the voltage waveform.

3. Repeat step 2 for different input voltage.

4. Observe the waveforms for voltage and current in resistance R and find the phase difference between them.

5. Repeat the above procedure for inductive and capacitive loads.

6. Observe the waveforms for voltage and current for passive components and emphasize a quantity, lagging or leading with respect to other quantity.

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