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TOPICS COVERED :
Introduction to CRO
Block diagram of CRO
Detailed description of CRT
Multi –Input Oscilloscope
Lissa...
HOW A CRO LOOKS LIKE
INTRODUCTION TO CRO
 Versatile electronic instrument giving visual
display of signals
 Used for measurement of frequency...
BASIC DIAGRAM
ANOTHER SCOOP….
WORKING OF A CRO
The main parts of Cathode
Ray Tube are:
•Electron Gun Assembly
•Focusing Anodes
•Deflection Plates Assembly
•Screen for CRT
Multi-Input Oscilloscope
Oscilloscope can have multiple input and display
facilities.
The most common one is of - TWO INPUTS
.
Although FOUR and EIGHT inputs are
available for special applications
There are primary two types of multi-input
oscilloscope :-
Single Beam Oscilloscope
Dual Beam Oscilloscope
Both of them ...
Dual Trace Oscilloscopes
In this oscilloscope two separate
vertical input channels are used.
There are two common operating modes
for the Electro...
BLOCK DIAGRAM
Dual Beam Oscilloscope
The Dual Beam Oscilloscope has two separate
electron beams , and therefore two
completely separate ...
There are two methods used for
generating the two electron beams
within the CRT.
The first method is :-
Double gun tube
...
Multiple input CRO works in
following two modes
alternate mode
chopped mode
Alternate mode
In alternate mode the an electronic switch
alternates between sig A & B.
Waveform in alternate mode
Chopped mode
In the chopped mode the switch free
runs at very high frequency.
Waveform of Chopped Mode
Lissajous Pattern
When two sinusoidal voltage signals of
equal frequency having some phase
difference are applied to the d...
Some examples of lissajous figures……..
With the help of lissajous figures we
can measure…….
Frequency
Phase
Frequency
Measurement
Fx/Fy = Hp/Vp
Fx = Unknown frequency
Fy = Known frequency
Hp = Points on horizontal tangencies
V...
Phase
Measurement
sin Ф = c/b
Digital Storage Oscilloscope
B
L
O
C
BLOCK DIAGRAM OF DSO
Advantage Of DSO
Stores waveform for infinite time
Digitize waveform can be processed in any way
Writing speed is more
...
Analog Storage Oscilloscope
Trace storage is an extra feature
They used direct-view storage CRTs
The storage is accomplished using the
principle of...
Data can be stored
to infinite time
Image quality is
good
Writing speed is high
Processing of signal
is easy
Data can...
THANK
u
Chepter 5 eim
Chepter 5 eim
Chepter 5 eim
Chepter 5 eim
Chepter 5 eim
Chepter 5 eim
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Chepter 5 eim

  1. 1. TOPICS COVERED : Introduction to CRO Block diagram of CRO Detailed description of CRT Multi –Input Oscilloscope Lissajous Patterns Types of Oscilloscope and it’s application
  2. 2. HOW A CRO LOOKS LIKE
  3. 3. INTRODUCTION TO 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.
  4. 4. BASIC DIAGRAM
  5. 5. ANOTHER SCOOP….
  6. 6. WORKING OF A CRO
  7. 7. The main parts of Cathode Ray Tube are: •Electron Gun Assembly •Focusing Anodes •Deflection Plates Assembly •Screen for CRT
  8. 8. Multi-Input Oscilloscope Oscilloscope can have multiple input and display facilities.
  9. 9. The most common one is of - TWO INPUTS . Although FOUR and EIGHT inputs are available for special applications
  10. 10. There are primary two types of multi-input oscilloscope :- Single Beam Oscilloscope Dual Beam Oscilloscope Both of them can be converted into a further Number of traces.
  11. 11. Dual Trace Oscilloscopes
  12. 12. In this oscilloscope two separate vertical input channels are used. There are two common operating modes for the Electronic Switch, called Alternate and Chop which can be selected from the instrument’s front panel. Dual Trace Oscilloscopes
  13. 13. BLOCK DIAGRAM
  14. 14. Dual Beam Oscilloscope The Dual Beam Oscilloscope has two separate electron beams , and therefore two completely separate vertical channels.
  15. 15. There are two methods used for generating the two electron beams within the CRT. The first method is :- Double gun tube Split Beam
  16. 16. Multiple input CRO works in following two modes alternate mode chopped mode
  17. 17. Alternate mode In alternate mode the an electronic switch alternates between sig A & B.
  18. 18. Waveform in alternate mode
  19. 19. Chopped mode In the chopped mode the switch free runs at very high frequency.
  20. 20. Waveform of Chopped Mode
  21. 21. 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.
  22. 22. Some examples of lissajous figures……..
  23. 23. With the help of lissajous figures we can measure……. Frequency Phase
  24. 24. Frequency Measurement Fx/Fy = Hp/Vp Fx = Unknown frequency Fy = Known frequency Hp = Points on horizontal tangencies Vp = Points on vertical tangencies
  25. 25. Phase Measurement sin Ф = c/b
  26. 26. Digital Storage Oscilloscope
  27. 27. B L O C BLOCK DIAGRAM OF DSO
  28. 28. Advantage Of DSO Stores waveform for infinite time Digitize waveform can be processed in any way Writing speed is more Processing of signal is easy
  29. 29. Analog Storage Oscilloscope
  30. 30. Trace storage is an extra feature They used direct-view storage CRTs The storage is accomplished using the principle of secondary emission Briefings
  31. 31. Data can be stored to infinite time Image quality is good Writing speed is high Processing of signal is easy Data can be stored for finite time Image quality is not poor Writing speed is poor Processing of signal is difficult Difference between ASO & DSO DSO ASO
  32. 32. THANK u

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