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CATHODE RAY OSCILLOSCOPE

CATHODE RAY OSCILLOSCOPE. Functional Units. a) Electron Gun b) Evacuated Tube c) Deflecting System d) Time Base e) Trigger Circuit. Electron Gun. a) Heating Filament b) Cathode c) Grid d) Electron lens. Link to figure. Return. Evacuated Tube. Vacuum space Screen

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CATHODE RAY OSCILLOSCOPE

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  1. CATHODE RAY OSCILLOSCOPE

  2. Functional Units a) Electron Gun b) Evacuated Tube c) Deflecting System d) Time Base e) Trigger Circuit

  3. Electron Gun

  4. a) Heating Filament b) Cathode c) Grid d) Electron lens Link to figure Return

  5. Evacuated Tube • Vacuum space • Screen • Graphite inner wall • Shielded from electric and magnetic fields Return Link to figure

  6. Deflecting System • X-plates • Y-plates • X and Y Deflection Amplifiers • X-shift Control • Y-shift Control • Sensitivity Control Return Link to figure

  7. Time Base • Sawtooth potential difference • Time period control Return Link to figure

  8. Trigger Circuit • Maintain a stable trace • Trig level control • Trigger time base • automatic triggering

  9. USES OF CRO a) Voltmeter b) Display of waveforms c) Measurement of short time intervals d) Measurement of frequency e) Display of phase relationship f) Comparison of frequencies

  10. Voltmeter • Calibration • D.C. voltmeter • A.C. voltmeter • Advantages over moving-coil voltmeters Return

  11. Display of Waveforms magnify Return

  12. Measurement of Short Time Intervals • Calibrate for the time base • Measure a very small time interval, e.g. measurement of sound speed in a metal rod Return

  13. Measurement of Frequency • Signal applied to Y-plates • ‘Lock’ the trace • Choose a suitable time base • Determine the period, T • Calculate the frequency Return

  14. Display of Phase Relationships Computer Simulation Return

  15. Comparison of Frequencies • Lissajous’ figures • Frequency ratio

  16. EXAMPLE

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