In this paper, I discuss the building of an induction meter to be used in small-inductance measurements in second-year electromagnetics teaching labs. An oscillator employing two transistors produces a signal whose time period can be measured with an oscilloscope and a simple equation allows to obtain the inductance in microhenrys from the period given in microsseconds. The induction meter transfer function show a remarkable accuracy for measurements within the 5 to 1000 µH. An example of activity class in electromagnetic teaching lab with a group of students and a discussion of results is also presented.
induction meter; laboratory; electromagnetism
