Design of the filament current sampling modules of intelligent Franck-Hertz instrument
Zhang Ming-chang · Physics Experimentation · 2009
In Franck-Hertz experiment,the first excitation voltage of the material filled in the tube is determined by the apex and vale position of the filament current,thus the accuracy of the experiment is mainly influenced by the method of filament current measurement.In this article,the module of CS5506,which is used for the data acquisition,is introduced and adopted for the intelligent Franck-Hertz experiment instrument.Meanwhile,the interface controlling circuit between CS5506 A/D convertor and Atmega16 is also provided.Finally,experiments are performed at different temperatures on this instrument,high accuracy experimental curves and data are obtained.