3B Scientific Fine Beam Tube T - Manual (Page 7)

3B SCIENTIFIC® PHYSICS
1
Fine Beam Tube U8481430
Instruction sheet
07/10 ALF
1 Fine beam tube
2 Connector base
3 Connection for anode
4 Connection for cathode
5 Connection for Wehnelt cylinder
6 Connection for heater
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.
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 danger-
ous to come into contact.
• Only use safety experiment leads for connecting
circuits.
• Only change circuits with power supply switched
off.
• Set up or dismantle the tubes only when the power
supply unit is switched off.
When the tube is in operation, the stock of the tube
may get hot.
• Allow the tube to cool before putting away the
apparatus.
The compliance with the EC directive on electromag-
netic compatibility is only guaranteed when using the
recommended power supplies.
2. Description
The Fine Beam Tube is used for investigating the de-
flection of cathode rays in a uniform magnetic field
produced by a pair of Helmholtz coils (U8481500). In
addition, it can also be used for quantitative determi-
nation of the specific charge of an electron e/m.