cathode ray oscilloscope. tube photograph. tube diagram. y plates. x plates. anode. heater supply. -. +. phosphor screen. H.T. supply. electron gun photograph. summary. electron gun produces a beam of electrons. light produced on the screen by electron beam.
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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
Peak p.d. = 3 Divisions x 1.0 mV/div = 3.0 mV
period = 4.0 divisions x 1.0 ms/div = 4.0 ms
frequency = 1 / period
frequency = 1 / 0.004 s
frequency = 250 Hz