CRO I - Calibration of Sine Wave:Practical- BE II SEM - ADVANCED PHYSICS

Aim : To Calibrate the Sinusoidal Wave

Apparatus : CRO (Cathode Ray Oscilloscope), Function Generator, cods etc
Formula :     T = t X Δ x     

                      Frequency= 1/ T = f   

  where,     t - times per divisions (reading)

 Δ x - Divisions (Peak to Peak difference)  

 f - Frequency from function Generator  

Diagram : (circuit)

Procedure : 

Calibration of Sinusoidal Wave

1) For Calibration of the Sinusoidal wave make the connections as shown in figure.

2) Check whether all the knobs of CRO are in released Position.

3) Now set the frequency from function Generator in the interval of 500 Hz.

4) Set the Sine wave on the screen of CRO such that only 2 to 3 peaks should be seen on the screen of CRO.

5) Take the peak to peak distance of sign wave as Δ x.

6) Multiply Time/div by the divisions i.e by Δ x. We get T(Time).

7) Take the reciprocal of Time. We get Frequency.

8) Finally check whether this calculated value of frequency is matched with the frequency from function generator or not.

Observation Table : 

Sr. No.	Applied Frequency (F.G.)	Time/div (a)	Peak-peak distance(b)	Time  T= (a) X (b)	Frequency F = 1/T
1.
2.
3.
4.
5.

Table: Measurement of Frequency by calibration of sine wave.

 Result : The Practical values of frequency and frequency from function generator are in good agreement. So for each value of selected frequency sine wave is calibrated.

Precautions :1) Do not use CRO in dusty condition.2) The knobs of CRO are in released Position.3) Do not increase the brightness of CRO, it not necessary.