CRO and DSO

1. N I D H I S H U L K A
A S S I S T A N T P R O F E S S O R
Electronics Measurement
CRO, DSO

2. CRO
 Introduction to CRO
 Block diagram of CRO
 Detailed description of CRT

3. HOW A CRO LOOKS LIKE

4. Introduction of CRO
 Versatile electronic instrument giving visual display
of signals
 Used for measurement of frequency ,amplitude,
phase etc.
 Also used in determining the nature and
characteristics of various components.
 Has a high bandwidth range thus making it a
sensitive and accurate device.
 Easier to use as the internal routine act as a guide to
the user

5. BLOCK DIAGRAM

6. Cathode Ray Tube
 The main parts of Cathode Ray Tube are:
•Electron Gun Assembly
•Focusing Anodes
•Deflection Plates Assembly
•Screen for CRT

7. Cathode Ray Tube

13. BLOCK DIAGRAM of CRO

14. CRO Measurement

15. Lissajous Pattern
When two sinusoidal voltage signals of equal
frequency having some phase difference are applied
to the deflection plates of CRO, a straight line or an
ellipse appears on the screen these figures are called
Lissajous figures or Lissajous curves or pattern.

16. Some examples of lissajous figures……..

17. With the help of lissajous figures we can measure…….
 Frequency
 Phase

18. Frequency Measurement
 Fx/Fy = Hp/Vp
Fx = Unknown frequency
Fy = Known frequency
Hp = Points on horizontal tangencies
Vp = Points on vertical tangencies

19. Block diagram of DSO

21. Thank you