1

Cathode Ray Oscilloscope• For display, measurement and analysis of waveform

2

• Very fast X-Y plotters (Lissajous pattern)

3

Cathode Ray Tube (CRT)

4

Photograph of electron gunVertical Deflection Plates

Accelerating Anode

Preaccelerating Anode

Focusing Anode

Control Grid

Heater Cathode

Internally coated with conducting material (Aquadag)

Internal Structure of CRT

H.T. supply

heater supply

y plates

x plates

+-phosphor screen

anode

H.T. supply

heater supply

y platesx plates

+-phosphor screen

anode

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

Function of Components of CRT

7