Electrical Characterization of a New Established Inductance Box Using an Automated Measurement System

M. Helmy A. Raouf, A. Eliwa Gad, El-Sayed Soliman A. Said , M. A. Elwany

Inductance box is an instrument that generates a variety of inductance values, which are used to verify the accuracy and to calibrate inductance measurement devices. In this paper, characterization of a new fabricated inductance box has been investigated by using an automated system developed for inductance measurements. The new verified inductance box had been constructed by three inductance decades giving 4096 inductance steps using the all possible combinations. The output inductance steps of this inductance box have been measured for each decade at different frequencies over the range form 1 kHz to 10 kHz to study its frequency dependence as will be illustrated in this research. At different voltage values in the range form 0.6 V to 2 V, the output inductance values have been also measured to demonstrate the voltage dependence of the tested inductance box as will be presented in this work. All practical results of each decade at different frequencies and voltage levels have been carefully analyzed through accurate calculations and necessary representing figures as will be clearly described in this paper. Relative accuracy of this inductance box is in the range from 5×10^-4 to 5×10^-3 at 1 kHz and 1V. Its relative uncertainty due to the summation effect has been founded to be less than 6×10^-5. The relative expanded uncertainty for such automated systems is typically less than 0.025%.