Instruction Sheet - 3B SCIENTIFIC PHYSICS U19152 Mode D'emploi

3B SCIENTIFIC ® PHYSICS

Instruction sheet

08/08 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.
•
The tube may only be used with tube holder D
(U19100).
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.
•
Only change circuits with power supply equip-
ment switched off.
•
Only exchange tubes with power supply
equipment switched off.
Luminescence Tube D U19152
When the tube is in operation, the stock of the tube
may get hot.
•
Allow the tube to cool before dismantling.
The compliance with the EC directive on electro-
magnetic compatibility is only guaranteed when
using the recommended power supplies.
The luminescence tube serves to demonstrate the
luminescence of a phosphorous anode when ex-
cited by electrons (cathodoluminescence) or ultra-
violet light (photoluminescence).
The luminescence tube is a highly evacuated tube
with an electron gun consisting of a pure tungsten
heater filament inside an apertured "cathode can"
and a cylindrical anode contained in a clear glass
bulb. A luminescence screen with three mica flags
with different phosphors is mounted on a metal support.
1
1 4-mm sockets for connect-
ing heater supply and
cathode
2 Heater filament
3 Cathode
4 4-mm plug for connecting
anode
5 Luminescence screen
5.1 Yttrium vanadate, acti-
vated with europium
5.2 Zinc sulfide, activated with
silver
5.3 Zinc sulfide, activated with
silver and cobalt
5.4 As 6.3 but graphite-coated
back to prevent heat radia-
tion
6 Boss
7 4-mm plug for lumines-
cence screen
2. Description