3B Scientific N-Doped Germanium on Printed Circuit Board - Manual

3B SCIENTIFIC® PHYSICS
1
N-doped germanium on circuit board 1009760
Instruction manual
03/12 ALF
1 Multi-pin plug
2 Spacer
3 Heating element
4 N-doped germanium crystal
5 PT100 thermocouple
1. Safety instructions
The germanium crystal is highly breakable:
• Handle the board carefully and do not put any
mechanical stress on it.
The sample circuit board can get very hot when in
operation (170°C) and there is a risk of burns.
• Before dismantling the board from the apparatus,
allow it sufficient time to cool.
Because of its high resistivity, the germanium crystal
will start to heat up as soon as a sample current is put
through it.
• Do not exceed the maximum sample current I =
±33 mA.
• Turn the trimmer for setting the sample current to a
position in the centre.
2. Description
The circuit board is intended for use with the Hall
effect basic apparatus (1009934) in order to measure
the conductivity and Hall voltage of n-doped
germanium as a function of temperature. In addition,
it is also possible to study how the Hall voltage
depends on an external magnetic field and the sample
current through the crystal.
The circuit board has a multi-pin plug with contacts for
a sample current, the resistive heating element and
the temperature sensor underneath the crystal.