The electron beam well defined, at high speed then passes through two sets of deflection plates. The first set of plates is oriented to deflect the electron beam vertically upward and downward. The direction of the vertical deflection is determined by the polarity of the applied voltage in the baffle plates. The amount of deflection is determined by the amplitude of the applied voltage. The beam is also deflected horizontally (left or right) by a voltage applied to the horizontal deflection plates. The accelerated beam is then deflected by very high voltages applied to the pipe, reaching finally a phosphor material on the inner surface of the tube. The phosphorous glows when hit by electrons energized – the brightness seen in front of the tube by a person using the oscilloscope.
The CRT is a complete unit to the base with conductors in the form of pins. Various types of CRTs are manufactured in a variety of sizes with different phosphor materials and position of deflection electrodes. Consider now how the CRT is used in the oscilloscope.
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