Energy Band Gap by Four Probe Method (ME 545)

Energy Band Gap by Four Probe Method
Energy band gap of Semiconductor material 
(Ge Crystal) By four probe method.
Power supply unit is housed in metal cabinet
and comprises of constant current generator 
0-20mA, Oven Power Supply & built in Digital
Voltmeter of 0-200mV/2V DC.
Probes Arrangement: 
It has four individually spring loaded, coated 
with Zn at the tips.
The probes are collinear and equally spaced. 
For more details please refer datasheet.