Instruction Sheet - 3B SCIENTIFIC PHYSICS U19157 Manuel D'utilisation

3B SCIENTIFIC

Instruction sheet

04/08 ALF
1. Safety instructions
Hot cathode tubes are thin-walled, highly evacu-
ated 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.
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 parame-
ters.
When the tube is in operation, the terminals of the
tube may be at high voltages with which it is dan-
gerous to come into contact.
•
Only change circuits 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.
•
Allow the tube to cool before dismantling.
®
PHYSICS
Gas Triode D U19157
1
The tube may only be used with tube holder D
(U19100).
The compliance with the EC directive on electro-
magnetic compatibility is only guaranteed when
using the recommended power supplies.
2. Description
The gas triode allows recording of the I
acteristic of a thyratron, observation of excited and
non-excited discharge and of the discontinuous
transfer of energy by helium atoms in inelastic
collision with free electrons.
The gas triode is a helium-filled tube with a pure
tungsten heater filament (cathode) and a round
metal plate (anode) with a wire grid between them,
all inside a clear glass bulb. The cathode, anode
and grid are all aligned parallel to one another.
This planar configuration corresponds to the con-
ventional symbol for a triode. A circular metal
plate attached as a backing to the filament ensures
that the electric field between the anode and cath-
ode is uniform.
1 Boss
2 4-mm plug for connecting
anode
3 Anode
4 Grid
5 Boss with 4-mm plug for
connecting grid
6 Heater filament
7 Cathode plate
8 4-mm sockets for heater
filament and cathode
– U char-
A A