1. cathode ray oscilloscope

2. tube photograph

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

4. electron gun photograph

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

6. gain andf time-base controls

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

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

9. self test