Experiment: Training Oscilloscope (230 V, 50/60 Hz)

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Thematic focus:_..

• Investigating the deflection of an electron beam in an electric field.
• Investigating the deflection of an electron beam in a magnetic field.
• Calibrating the frequency control of the sawtooth generator.
• Demonstrating the display of signals on an oscilloscope, using the periodic signal from a function generator.

Experiment description:_..

The student oscilloscope can be used to study the physical principles of the time-resolved display of electrical signals on a fluorescent screen. In a Braun tube, a focused electron beam is generated, and the point at which it falls on the fluorescent screen is observed as a spot of green light. When the electron beam is deflected by a sawtooth voltage applied between a pair of plates, it moves at a constant speed from left to right across the screen, then flies back to the starting point. This process is repeated cyclically at a frequency that can be adjusted. The time-dependent voltage that is to be displayed is applied to a coil outside the tube, so that the beam is deflected vertically in the magnetic field of the coil. The time-dependence of the signal is resolved by the simultaneous horizontal motion of the electron beam and displayed on the fluorescent screen.