3b-scientific Teltron Maltese Cross Tube D User Manual download pdf

3B SCIENTIFIC

PHYSICS

Maltese Cross Tube D 1000649

Instruction sheet

09/13 ALF

23 5 6

1 4-mm sockets for filament and

cathode

2 Heater filament

3 4-mm plug for connecting anode

4 Boss

5 Maltese cross

6 Fluorescent screen

7 Boss with 4-mm plug connected to

the Maltese cross

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 connection leads to any

tension.

• The tube may only be used with tube holder D

(1008507).

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.

• 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.

• If necessary, allow the tube to cool before

dismantling.

The compliance with the EC directive on elec-

tromagnetic compatibility is only guaranteed

when using the recommended power supplies.

2. Description

The Maltese cross tube is used to demonstrate

how cathode rays propagate in straight lines in

the absence of any electric or magnetic field.

This is shown by placing a Maltese cross in the

path of the beam to throw a shadow on a fluo-

rescent screen. The tube is also used to show

how beams can be focussed by magnetic fields.

This serves as an introduction to electron optics.

The Maltese cross tube is a highly evacuated

tube with an electron gun consisting of a pure

tungsten, 'hairpin' heater filament and a cylindri-

cal anode all contained in a clear glass bulb.

The electron gun emits a diverging beam which

is detected by a luminescent screen. An alumin-

ium Maltese cross is suspended in the centre of

the bulb. The lower limb of the cross has a small

hole 3-mm in diameter so that the orientation of

the shadow can be distinguished when it is af-

fected by a magnetic field.

1 2 3 4

Summary of Contents

Page 1 - PHYSICS

3B SCIENTIFIC® PHYSICS 1 Maltese Cross Tube D 1000649 Instruction sheet 09/13 ALF 23 5 6-741 1 4-mm sockets for filament and cathode 2 H

Page 2

2 3. Technical data Filament voltage: ≤ 7.5 V AC/DC Anode voltage: 2000 V to 5000 V Anode current: 0.18 mA at UA = 4000 V Voltage at cross: 2000 V

Page 3 - DC POWER SUPPLY 0 ... 5 kV

3 Anode voltage variations provide a further ele-ment of control. Cathode rays and deflecting fields can thus be used to magnify shadow images in a ma

Page 4

A TELTRON Product from UK3B Scientific Ltd. ▪ Suite 1 Formal House, Oldmixon Crescent ▪ Weston-super-Mare Somerset BS24 9AY ▪ Tel 0044 (0)1934 425333

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3b-scientific Teltron Maltese Cross Tube D User Manual

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