Physics Lab Equipment

LEAI-30 Apparatus of Franck-Hertz Experiment - Basic Model

LEAI-30 Apparatus of Franck-Hertz Experiment - Basic Model

Note: oscilloscope not included


  • No preheating for Argon gas tube

  • Multiple modes: manual recording, oscilloscope viewing or data processing (digital oscilloscope needed)

  • Visible Argon tube

  • Optional data acquisition card for PC use via USB port


This LEAI-30 Franck-Hertz experiment apparatus is a low cost instrument to demonstrate the existence of Bohr atomic energy levels. Experimental results can be acquired by manual data recording, or viewed on an oscilloscope, or processed using a digital storage oscilloscope. No oscilloscope is necessary if an optional data acquisition (DAQ) card is ordered for use with a PC via USB port. It is an ideal teaching apparatus for physics laboratories at colleges and universities.

The instruction manual contains comprehensive materials including experimental configurations, principles and step-by-step instructions. Please click Experiment Theory and Contents to find more information about this apparatus.



Voltage to Franck-Hertz tube

VG1K1.3 ~ 5 V
VG2A (rejecting voltage)1.3 ~ 15 V
VG2K--point by point0 ~ 100 V
VG2K--on oscilloscope0 ~ 50 V
VH (filament voltage)AC: 3,3.5,4,4.5,5,5.5,& 6.3 V

Parameters of sawtooth wave

Scanning voltage0 ~ 60 V
Scanning frequency115 Hz ± 20 Hz
Voltage amplitude of scanning output≤ 1.0 V
Micro current measuring range10-9~10-6 A

Number of measured peaks

point-to-point≥ 5
on oscilloscope≥ 3

Parts List

Main Unit1
Argon Tube1
Power Cord1
DAQ with Software (Optional) 1

LEAI-30 Apparatus-1.jpg

Experimental curve on oscilloscope


Experimental curve acquired by DAQ

(Click graph to enlarge)

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