3b-scientific Teltron Perrin Tube S User Manual download pdf

3B SCIENTIFIC

PHYSICS

Perrin Tube S 1000616

Instruction sheet

12/12 ALF

12 345 6 7 8 9

1 Guide pin

2 Connection pins

3 Heater and cathode

4 Cathode can

5 Anode

6 Deflector plates

7 Fluorescent screen

8 Faraday cage

9 4 mm plug connected to

Faraday cage

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 only may 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.

• Only use safety experiment leads for con-

necting circuits.

• Only change circuit with power supply equip-

ment 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 Perrin tube serves to demonstrate the

negative polarity of electrons and to estimate the

specific electron charge e/m by magnetic deflec-

tion into a Faraday cage, which is connected to

an electroscope. It is also possible to investigate

the deflection of electrons in two perpendicular

magnetic alternating fields or by collinear elec-

tric and magnetic alternating fields (Lissajous

figures).

The Perrin Tube is a highly evacuated tube with

an electron gun, consisting of an oxide cathode

heated indirectly via a heating coil, a cylindrical

anode and pair of deflector plates contained in a

clear glass bulb, partly coated with a fluorescent

screen. The electrons emitted by the electron

gun form a narrow circular beam that can be

seen as a spot on the fluorescent screen. A

glass tube with a Faraday cage is set on the

glass bulb at about 45° to the undeflected beam.

1 2 3 4 5 6

Summary of Contents

Page 1 - PHYSICS

3B SCIENTIFIC® PHYSICS 1 Perrin Tube S 1000616 Instruction sheet 12/12 ALF 12 345 6 7 8 9 1 Guide pin 2 Connection pins 3 Heater and cat

Page 2

2 3. Technical data Filament voltage: ≤ 7.5 V AC/DC Anode voltage: 2000 V to 5000 V Anode current: typ. 0.18 mA at UA = 4000 V Beam current: 4 µA

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

3 • Connect the auxiliary coil to the alternating current source. • Connect the Helmholtz coils to the function generator and choose a sinusoidal wa

Page 4

4 r Fig. 2 Definition of the curvature radius r DC POWER SUPPLY 0 ... 5 kV012345KV0 ... 5 kVZAUFUAZAIA Fig. 3 Estimation of the specific electron c

Page 5 - 0...12 V

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

Page 6

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3b-scientific Teltron Perrin Tube S User Manual

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