3B Scientific Dual Pole Tube - Manual

3B SCIENTIFIC ® PHYSICS
1
Dual Pole Tube U8482360
Instruction Sheet
10/10 LT/ALF
1 Anode terminal
2 Sockets for heater voltage
3 Base
4 Getter
5 Dual pole tube
1. Safety Instructions
When the instrument is used in accordance with the
instructions and regulations, safe operation is ensured.
However, safety is not guaranteed if the instrument has
been treated inappropriately or carelessly.
If there is reason to believe that safe operation is
no longer possible (e.g., if there is visible damage),
the instrument must not be used, or if in use it
must be taken out of service immediately.
Excessive voltages or currents or an incorrect
cathode temperature can damage the tube
irreparably.
• Keep within the specified operating
parameters.
• Do not apply a heater voltage greater than 5 V.
When the tube is being operated, there may be
dangerously high voltages in the area of the connections.
• Only use safety experiment leads for the
connections.
• Only make connections when the voltage
supply is switched off.
The instrument is not suitable for student experiments.
2. Description
The dual pole tube is used for demonstrating the
Edison effect, for confirming the Richardson
equation, and for measuring the current/voltage
characteristic (I
A
/U
A
curve) of a diode.
The electrode system, consisting of a tungsten
cathode and a cylindrical anode of sheet nickel, is
housed in an evacuated glass bulb. The heating
current for the tungsten cathode can be varied
within the electron-emitting range. The anode
connection is safe to handle and is mechanically
fixed to the glass bulb.
The tube also incorporates another system (the
getter), which serves to generate a high vacuum
during the manufacture of the tube, and is not
relevant to the functioning of the instrument.
3. Equipment supplied
1 Dual pole tube
1 Tube base with safety connection sockets
1 Instruction sheet