Experiment No: 5 - Electronic Workshop Lab

Experiment No: 5

Study of Cathode Ray Oscilloscope (CRO)

Aim:

A)    Find the Amplitude and Frequency of Signal using CRO

B)    Measure the Unknown Frequency & Phase difference of signals using Lissajous figures.

Components and Equipments Required:

S.NO	Components / Equipments	Quantity
1	Cathode-ray oscilloscope	1
2	Function Generator	2
3	Decade Resistance Box (DRB)	1
4	Capacitor	1
5	CRO Probes	2
6	Bread Board

A)   Measurement of Amplitude: Procedure:

1.        Make the connections as per the diagram shown above.

2.        Put the CRO on a single channel mode and bring the CRO into operation by adjusting the trace of the beam to a normal brightness and into a thin line.

3.        Now apply the sinusoidal wave of different amplitudes by using the LEVEL and COARSE buttons of the function generator.

4.        Note on the vertical scale the peak to peak amplitude (Vpp).

Observations

S. No.	No. of Vertical Divisions(X)	Voltage/ Division (Y)	Vp-p=X*Y

B)   Measurement of Frequency:

 Procedure:

1.        Make the connections as per the diagram shown above.

2.        Put the CRO on a single channel mode and bring the CRO into operation by adjusting the trace of the beam to a normal brightness and into a thin line.

3.        Now apply the sinusoidal wave of different frequencies by using the LEVEL and COARSE buttons of the function generator.

Note down the horizontal scale period (T) in second by observing difference between the two successive peaks of the waveform.

Observations:

S. No.	No. of Horizontal Divisions(X)	Time/Division (Y)	T=X*Y	f=1/T

Precautions:

1. Connections are made as per the circuit diagram and should be tight.

2. Do not connect power to a circuit until the circuit is finished and never work on a circuit while power is applied.

3. If anything is burning, immediately disconnect the power and examine your circuit to find out the problem.

OUTCOMES:

Results:

 1. Working of CRO is studied. Amplitude and Frequency a signal is found using CRO.

2. Unknown Frequency & Phase difference are measured using Lissajous figures in CRO.