Franck-Hertz control unit

Function and Applications

Compact operating unit for Franck-Hertz experiment to be used with Hg- and Ne-tubes.

In 1913/14 James Franck and Gustav Hertz approved Bohr's model of atoms with this experiment (Nobel Prize: 1925).

Benefits

• Automatic detection of tube type and automatic limitation of tube parameter.
• Examination by direct reading of displayed values, xt-recorder, oscilloscope or PC.
• From the recorded anode current as a function of acceleration voltage the exitation energy of the atoms can be determined.

Equipment and Technical Data

For control and measurement of all tube parameters:

• Heating voltage (const.): 6.5 ± 0,5 V
• Acceleration voltage: 0...99 V
• Counter voltage: 0...12 V
• Emission voltage: 0...6 V
• Heater voltage: 0...10 V
• Resolution (all voltages): 0.1 V
• Heater current: 400 mA
• Heater temperature: 0...999 °C
• Anode current: 0...50 nA
• Output 4 mm-sockets:
• Acceleration voltage: 0...10 V (10 V ~ 100 V)
• Voltage prop. anode current: 0...10 V (10 V ~ 50 nA)
• Data output: USB socket
• Display: 20 mm 7-segment LED
• 4 operation modes: manually, automatic ramp, saw tooth (oscilloscope) and PC-control
• Power control for heater with safety socket (600 W) and type K socket for thermocouples
• Socket for 5-pole connection cable for Hg/Ne-tube