Establishment of new automated multi range thermal current converter

<p>A new automated multirange thermal current converter (TCC) has been designed and implemented at the National Institute of Standards (NIS), Egypt. Five single junction converters (SJTCCs) have connected in parallel on PCB with an LCD, keypad a microcontroller to control five fast switching relays. This TCC cover ac ranges from 500 mA 5 A frequencies 40 Hz up 100 kHz. The construction presented solve some problems using shunt resistance high currents. Furthermore, automatic calibration system established calibrate against another standard TCC. software program specially MATLAB overcome manual measurement. expanded uncertainties are estimated for all different also, ac-dc differences. performance is also evaluated by comparing its accuracy measuring currents traditional TCC.</p>