Research on the Visual Measurement Method of Inductance Parameters

Inductors have many parameters, of which the two most important parameters determine the performance of the inductor: inductance and saturation current. The existing inductance parameter measurement methods can either measure the inductance value more accurately or use other auxiliary means to measure the saturation current, but they cannot measure the inductance value and the saturation current at the same time. A simple resistance inductance series measurement circuit is designed by combining the special single trigger and graphic display technology of digital storage oscilloscope. According to the measurement definition of inductance value, measure the voltage value at both ends of the inductance and the current change value of the sampling resistor to calculate the inductance value. The digital storage oscilloscope displays the inflection point of the measurement curve, and the inductor saturation current can be calculated. It is verified by experiments that this method can obtain accurate inductance values and at the same time obtain intuitive saturation current values. The method is simple in principle, reasonable in design, and easy to operate. It is an economical and effective method for measuring inductance parameters in the absence of an LCR tester in the laboratory.