It is a IC regulated current source to provide a constant current to the probe irrespective of the changing resistance of the sample due to change in temperatures/magnetic field. The basic scheme is to use the feed-back principle to limit the load current of the supply to a pre-set maximum value. Variations in the current are achieved by a potentiometer. The supply is a highly regulated and practically ripple free d.c. source. The current is measured with a 3½ digit LED display for greater resolution and reading convenience.
Open Circuit Voltage : 10 V
Current Range : 0-20 mA & 0-200 mA
Resolution : 10 μA at 0-200 mA range
Load regulation : 0.05% for 0 to full load
Line regulation : 0.05% for 10 % variation
Input : 220V ± 10%, 50Hz.
Display : 31⁄2 digit 7 segment LED display (12.5 mm height) with autopolarity and decimal indication
Overload Indicator : Sign of 1 on the left & blanking of other digits