It is used to measure rise in temperature at various points as mentioned in standard at junctions for tests upto 2000 A.
The set-up consists of a servo controlled motorized variac, a specially designed step down transformer system, PC based control system, Temperature data logging on PCand other indications . Digital voltmeter Primary Voltage indicates the position of auto transformer (variac).
Servo controlled mechanism is used to maintain constant current throughout the test in manual mode. CR/AL('K' type) type thermocouples are used for temperature sensing.