Electrical and Electronic Measurement

1. Electrical and Electronic Measurement
Cathode Ray Oscilloscope
Parveen Malik
Assistant Professor
School of Electronics Engineering
KIIT University
parveen.malikfet@kiit.ac.in
October 30, 2019
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2. Outline
1 Cathode Ray Oscilloscope
2 Cathode Ray Tube - Construction
3 Electrostatic Lens
4 Electrostatic Deflection
5 Phase and Frequency Measurement
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3. Cathode Ray Oscilloscope

4. Cathode Ray Oscilloscope
Cathode Ray Oscilloscope is an electronic voltmeter.
Applications - To display and measure Peak voltage, Frequency,
Phase difference, Pulse Width, Delay Time, Rise Time,Fall
Time.
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5. Cathode Ray Tube - Construction

6. Cathode Ray Oscilloscope
CRT Construction
Cathode Ray Tube
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7. Cathode Ray Oscilloscope
CRT Construction
CRO Block Diagram
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8. Cathode Ray Oscilloscope
Electron Lens
Electrostatic Lens
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9. Electrostatic Deflection

10. Electrostatic Deflection
Electrostatic Deflection
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11. Phase and Frequency
Measurement

12. Phase and Frequency Measurement
Lissajous Pattern - Equal Frequency
(a) (b)
Phase difference (a) φ = 0◦
(b) φ = 180◦
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13. Phase and Frequency Measurement
Lissajous Pattern- Equal Frequency
(a) (b)
Phase difference (a) φ = 90◦
(b) φ
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14. Phase Measurement
Lissajous Pattern
Lissajous Pattern for different phases
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15. Frequency Measurement
Lissajous Pattern- Different Frequency
Lissajous pattern with frequency ratio 2:1
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16. Frequency Measurement
Lissajous Pattern- Different Frequency
(a) (b)
(c)
Lissajous pattern with (a) Different frequency ratio (b) Half tangencies (c)
Frequency measurement
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