Franck-Hertz control unit

Item No. 09105-99 | Type: Equipment & Accessories

Teachers/Professors , Students
Delivery time: available
EUR 1,988.40
Content 1 piece
EUR 2,366.20 Incl. VAT

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).


  • Automatic detection of tube type and automatic limitation of tube parameter.
  • Examination by direct reading of displayed values, xyt-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 ß anode current: 0...10 V (10 V ~ 50 nA)
  • Data output: RS232 SubD-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

Compatible accessories

Device name
Item No.

(de) Bedienungsanleitung
0910599d .pdf
Filesize 0.37 Mb
(en) Operating instructions
0910599e .pdf
Filesize 0.36 Mb
(es) Bedienungsanleitung
0910599s .pdf
Filesize 0.88 Mb
(de) FAQ
faq_09105-99 .pdf
Filesize 0.30 Mb