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3. Contents
1 Critical potentials tube S with He filling
1 Battery unit (battery not included)
1 Shielding
1 Manual
4. Technical data
Gas filling:
Filament voltage:
Anode voltage:
Anode current:
Collector voltage:
Collector current:
Glass bulb:
Length of tube:
5. Additionally required
For operating the tube:
1 Tube holder S
1 Control Unit for Critical Potential Tubes
(115 V or 230 V)
1 DC-Power Supply, 0–20 V
(115 V or 230 V)
or
1 Power Supply Unit for Franck-Hertz Experiment
(115 V or 230 V)
For making measurements:
1 Analogue Oscilloscope 2x30 MHz
2 HF Patch Cords, BNC/4 mm Plug
or
TM
1 3B NETlog
(115 V or 230 V)
TM
1 3B NETlab
1 Battery AA 1.5 V
1 Set of 15 Safety Experiment Leads 1002843
6. Operation
6.1 Setting up the tube in the tube holder
•
The tube should not be mounted or removed
unless all power supplies are disconnected.
•
Press tube gently into the stock of the holder
and push until the pins are fully inserted.
Helium
≤ 7 V DC
U
F
≤ 60 V
U
A
≤ 10 mA
I
A
= 1,5 V
U
R
≤ 200 pA
I
R
130 mm diam. approx
260 mm approx.
1014525
1000633 / 1008506
1003311 / 1003312
1012819 / 1012818
1002727
1002748
1000539 / 1000540
1000544
Take note of the unique position of the guide
pin.
6.2 Removing the tube from the tube holder
•
Allow the tube to cool before dismantling.
•
To remove the tube, apply pressure on the
guide pin until the pins loosen, then pull out
the tube.
7. Example experiment
Determine the critical potentials of a helium
atom
7.1 General notes
The experiment set-up with the critical potential
tube is highly sensitive to sources of electro-
magnetic interference. (computers, fluorescent
lights).
•
Select a location for the experiment where
electromagnetic
avoided.
7.2 Experiment set-up with the control unit
for critical potential tubes
Insert the tube into the tube holder.
•
Provision of heater voltage V
•
Connect the sockets F3 of the tube holder to
the positive terminal of the DC power supply
and F4 to the negative terminal. (see Fig. 1)
Provision of accelerating voltage V
•
Connect socket C5 of the tube holder to the
negative terminal of the output V
control unit and to the negative terminal of
the DC power supply.
Connect socket A1 to the positive terminal of
•
the output V
on the control unit.
A
Provision of collector voltage V
The positive pole of the output V
•
connected to the negative pole of the 1.5-V
battery.
•
Connect the positive terminal of the 1.5 V
battery to an earth socket on the control unit.
•
Put the shielding over the tube and slot it into
the groove on the tube holder so that the tube
is completely enclosed by shielding. Then
connect the control unit by means of the
ground socket.
•
Connect the lead from the collector ring to
the BNC input socket of the control unit.
2
interference
can
:
F
:
A
on the
A
:
R
should be
A
be
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