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3B SCIENTIFIC ® PHYSICS
Instruction sheet
12/12 ALF
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1. Safety instructions
Hot cathode tubes are thin-walled, highly
evacuated glass tubes. Treat them carefully as
there is a risk of implosion.
•
Do not subject the tube to mechanical stresses.
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Do not subject the cable connected with the
anode to any tension.
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The tube may only be used with tube holder S
(1014525).
If voltage or current is too high or the cathode is
at the wrong temperature, it can lead to the tube
becoming destroyed.
Do not exceed the stated operating parameters.
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When the tube is in operation, the terminals of
the tube may be at high voltages with which it is
dangerous to come into contact.
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Only use safety experiment leads for con-
necting circuits.
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Only change circuits with power supply
equipment switched off.
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Only exchange tubes with power supply
equipment switched off.
When the tube is in operation, the stock of the
tube may get hot.
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Allow the tube to cool before dismantling.
Dual Beam Tube S 1000622
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1 Guide pin
2 Connection pins
3 Axial electron gun
4 Perpendicular electron gun
5 Deflector plate
6 Fluorescent screen
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The EC directive on electromagnetic compatibil-
ity is only guaranteed when using the recom-
mended power supplies.
2. Description
The dual beam tube can be used to determine
the specific charge e/m from the diameter of the
path followed by electrons fired into the tube
from a perpendicularly mounted gun with a ver-
tically aligned magnetic field and observation of
the spiral path followed by electrons fired axially
into a co-axial magnetic field.
The dual beam tube is a partly evacuated elec-
tron tube, filled with helium at low pressure and
equipped with both axial and perpendicular elec-
tron guns. The electron beams are perpendicu-
lar to one another and a common deflector plate
is provided for both guns. The electron beam
source is an oxide cathode heated indirectly via
a heating coil. The electron paths show up as a
fine, slightly greenish beam due to impact exci-
tation of the helium atoms.
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