3B SCIENTIFIC PHYSICS 1008522 Guia De Inicio Rapido página 3

3B SCIENTIFIC ® PHYSICS
Undoped germanium on circuit board 1008522
Instruction manual
03/12 ALF
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 = ±4 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 of undoped germanium as a function
of temperature.
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.
1 Circuit board with germanium crystal
1 Test record
1 Instruction manual
4. Technical data
Maximum sample current:
Dimensions of crystal:
Dimensions:
Weight:
1
1 Multi-pin plug
2 Spacer
3 Heating element
4 Undoped germanium crystal
5 PT100 thermocouple
3. Contents
±4 mA
20x10x1 mm approx.
70x70x10 mm approx.
30 g approx.