KE5521 Cathode Ray Oscilloscope

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Standard cathode ray tubes for oscilloscopes are poorly suited for demonstrations because important sections of the tubes are electrostatically and magnetically shielded, thus concealed from the view of the observer. Furthermore, these conventional cathode ray tubes require high accelerating voltages making them dangerous for an exposed setup. In order to overcome these disadvantages Klinger has developed an experimental oscilloscope for teaching purposes.

Cathode Ray Oscilloscope consists of a modified Braun tube, screen diameter 10 cm, an indirectly heated cathode with a near point source emissive oxide spot, and a disc anode with axial hole. The fluorescent screen employs zinc silicate as phosphor, emitting green light when struck by the electron beam. The prismatic deflection capacitor consists of two deflector plates 20 mm long, 12 mm apart, and positioned between the anode and the fluorescent screen. The tube is mounted on a base plate that delineates the wiring diagram and allows connection of the necessary voltages. The tube is further supported by a ridged ring that allows three solenoid coils to be arranged for magnetic deflection of the beam. These coils, comprised of 2 x 300 turns each and have a DC resistance of 5 Ohms, are on the same plane as the electrostatic deflector plates. A low anode voltage of only 250 VDC is employed.

Experiments

• Magnetic deflection of the cathode ray
• Approaching a magnet from the side
• Deflection with current carrying coils
• Deflection with horizontal coil
• Variable magnetic field
• Vertical deflection
• Observation in rotating mirror
• Phasing
• Phase shift by introducing iron core to coil
• Lissajous Figures
• Electrostatic deflection
• Introducing a timebase
• Sawtooth generator
• Depiction of voice oscillations
• Rotating magnetic field
• Hysteresis loops