Experimental curve on oscilloscope
Experimental curve acquired by DAQ
(Click graph to enlarge)
Note: oscilloscope not included
Features
No preheating for Argon gas tube
Multiple modes: manual data recording, oscilloscope viewing, or data acquisition with software
Visible Argon tube with backlight
Built-in data acquisition card for PC via USB port
Introduction
The LEAI-32 Franck-Hertz experiment apparatus can demonstrate the existence of Bohr atomic energy levels. Experimental results can be recorded by manual data taking, viewed on an oscilloscope, or acquired using a built-in data acquisition (DAQ) card for PC via USB port. No oscilloscope is necessary when using the built-in DAQ card with a PC. 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.
Using this instrument, the following experiments can be conducted:
1. Observe the relationship curve between plate current and accelerating voltage
2. Understand the processes of electron-atom collision and energy exchange
3. Calculate the 1st excitation potential of Argon atom from experimental data
4. Using the acquired 1st excitation potential to calculate Planck’s constant
Specifications
| Description | Specifications |
| Curve peaks | ≥ 7 |
| Franck-Hertz tube | Argon gas, backlight illuminating, open side window |
| Filament voltage VF | 1.25 ~ 5 V, continuously adjustable 3-1/2 digital display |
| Control voltage VG1K | 0 ~ 6 V, continuously adjustable 3-1/2 digital display |
| Accelerating voltage VG2K | 0 ~ 90 V, continuously adjustable 3-1/2 digital display |
| Decelerating voltage VG2P | 1.25 ~ 5 V, continuously adjustable 3-1/2 digital display |
| Micro current measurement | 1 μA, 0.1 μA, 10 nA, 1.0 nA, range 0.001 nA ~1.999 μA, 3-1/2 digital display |
Parts List
| Description | Qty |
| Main unit | 1 set (incl F-H tube, scanning voltage, current amplifier) |
| BNC cable | 2 |
| USB cable | 1 |
| Software CD | 1 |
| Instructional manual | 1 |
| Power cord | 1 |
Experimental curve on oscilloscope
Experimental curve acquired by DAQ
(Click graph to enlarge)
