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4. Electricty and magnetism

4. Electricty and magnetism. 4.6 Cathode – ray oscilloscopes (a) Cathode rays. 4.6 Cathode-ray oscilloscopes. Thermionic emission. Thermionic emission. Thermionic emission. The Electron gun. What is an Electron Gun?. The electron gun structure. electron gun photograph.

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4. Electricty and magnetism

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  1. 4. Electricty and magnetism 4.6 Cathode – rayoscilloscopes (a) Cathoderays

  2. 4.6 Cathode-rayoscilloscopes

  3. Thermionicemission

  4. Thermionicemission

  5. Thermionicemission

  6. TheElectrongun What is an Electron Gun?

  7. Theelectrongunstructure

  8. electron gun photograph

  9. Electronenergy • Where: e = electroncharge ( 1.6 x10-19 C) V = d.cvoltage (cathode – anode)

  10. Cathoderaysproperties • These rays originate from cathode. • Cathode rays travel in straight line. • Cathode rays carry negative charge. • Cathode rays are deflected by electric field. • Cathode rays are deflected by magnetic field. • These rays consist of material particles. • Cathode rays consist of "electron". • Produce a shadow when obstructed by objects. • Cathode rays can produce fluorescence.

  11. Deflectiontube

  12. Magneticdeflection

  13. 4.6 (b) Simple treatment of cathode-ray oscilloscope

  14. cathode ray oscilloscope

  15. tube photograph

  16. tube diagram y plates x plates anode heater supply - + phosphor screen H.T. supply

  17. electron gun produces a beam of electrons light produced on the screen by electron beam a p.d. across the y plates deflects the trace vertically a p.d. across the x plates deflects the trace horizontally summary y plates x plates anode heater supply - + phosphor screen H.T. supply

  18. gain andf time-base controls

  19. peak voltage Peak p.d. = 3 Divisions x 1.0 mV/div = 3.0 mV

  20. period & frequency period = 4.0 divisions x 1.0 ms/div = 4.0 ms frequency = 1 / period frequency = 1 / 0.004 s frequency = 250 Hz

  21. self test

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