The mutual shunt method of measuring self inductance at radio frequencies
Albert Campbell · Proceedings of the Physical Society · 1938
A simple method of measuring self inductance is described, in which the value is read directly on a mutual inductometer. Its secondary circuit, with an a.-c. ammeter in series, is put in parallel with the coil to be tested, the combination being connected, thro' the primary coil, to an a.-c. source of radio frequency giving constant current. The mutual inductance is now varied until the ammeter reads a minimum current, and then the self inductance is equal to the mutual inductance. This result does not involve resistance or frequency. Methods for eliminating the errors due to self and mutual capacitances in the inductometer are indicated.