Setup
Procedures
First:
– Make sure the Franck-Hertz supply unit is switched off.
– Connect the heating oven via the 4-mm safety sockets (a)
on the rear of the supply unit.
– Additionally, connect the copper lead of the copper sleeve
with 4-mm plug to the green-yellow safety socket (to
screen the Franck-Hertz tube from interference fields).
– Insert the DIN plug of the temperature sensor in socket (b)
of the supply unit and the DIN plug of the Franck-Hertz tube
in socket (c)
Heating:
Note:
If the thermal contact of the temperature sensor is poor, the
measured oven temperature will be too low, resulting in overheating of the tube.
– Insert the temperature sensor in the corresponding blind
hole of the heating oven as far as it will go and slide the
Franck-Hertz tube with copper sleeve into the oven.
– Turn the operating-mode switch (d) to RESET and switch
on the supply unit (after a few seconds, the LED indicator
for mercury (Hg) changes from green to red).
– Check the default setting qs = 180 8C and wait until the
operating temperature is reached (LED indicator changes
from red to green; the temperature q first reaches a maximum, and then declines to the final value)
If the indicator in the display flashes:
– There is a mistake in the setup for temperature measurement (see the Instruction Sheet).
Optimizing the Franck-Hertz curve:
Carrying out the experiment
_ Record the Franck-Hertz curve (see preliminary remark).
– To better demonstrate the first maxima, you can increase
the sensitivity of the Y-input and repeat the recording
process.
Measuring example and evaluation
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