3B Scientific Teltron Diode D - Manual

3B SCIENTIFIC® PHYSICS
1
Diode D 1000646
Instruction sheet
08/12 ALF
4 2 1
3
3 5 6 1 4-mm plug for connect-
ing anode
2 .Anode
3 Boss
4 Cathode filament
5 Filament backing plate
6 4-mm sockets for
cathode and filament
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.
When the tube is in operation, the terminals of
the tube may be at high voltages with which it is
dangerous to come into contact.
• 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.
• 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 diode allows basic experiments to be per-
formed on the Edison effect (thermionic effect),
demonstrates how the emission current de-
pends on the power supplied to heat the hot
cathode, allows recording diode characteristics
and shows the use of the diode as a rectifier.
The diode is a highly evacuated tube with a pure
tungsten heater filament (cathode) and a circular
metal plate (anode) inside a clear glass bulb.
The cathode filament and the anode plate are
parallel to one another. This planar configuration
corresponds to the conventional symbol for a
diode. A circular metal plate is attached to one
of the filament leads. This ensures that the elec-
tric field between the anode and cathode is uni-
form.