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3B Scientific Teltron Dual Beam Tube S User Manual

3b scientific® physics

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3B SCIENTIFIC® PHYSICS




1

Dual Beam Tube S 1000622



Instruction sheet

12/12 ALF

1

2

3

4

6

5

1 Guide pin
2 Connection pins
3 Axial electron gun
4 Perpendicular electron gun
5 Deflector plate
6 Fluorescent screen






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.

Do not subject the cable connected with the

anode to any tension.

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.

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.

Only use safety experiment leads for con-

necting circuits.

Only change circuits with power supply
equipment switched off.

Only exchange tubes with power supply

equipment switched off.

When the tube is in operation, the stock of the

tube may get hot.

Allow the tube to cool before dismantling.

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.