Introduction to Electron Multiplier Section
The returning stream of electrons reaches the gun close to the aperture by which electron beam come out. The aperture is an element of a metal disc that covering the gun electrode. While the returning electrons strike the disc that is at a positive potential of about 300 volts, regarding to the target, they generate secondary emission. The disc acts as first stage of the electron multiplier. Succeeding stages of the electron multiplier are managed symmetrically around and back of the first stage. So secondary electrons are attracted to the dynodes' at increasingly higher positive potentials. Five stages of multiplication are employed, details of that are displayed in diagram. Each multiplier stage gives a gain of about 4 and so an entire gain 45 1000 is acquired at the electron multiplier. This is termed as signal multiplication. The multiplication so acquired keeps a high signal to noise ratio. The secondary electrons are at last collected through the anode that is connected to the maximum supply voltage of +1500 volts in series along with a load resistance RL. The anode current through RL has similar variations that are present in the return beam from the target and amplified through the electron multiplier. So voltage across RL is the wanted video signal; the amplitude of that changes in accordance with light intensity differences of the scene being televised. The outcome beyond RL is capacitive coupled to the camera signal amplifier. By RL = 20 KOhms and classic dark and high light currents of magnitudes 30 A and 5 A correspondingly, the camera output signal will comprise an amplitude of 500 mV peak-to-peak.
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