A direct-reading instrument for measurements of inductance and Q of ferrite core coils

摘要

A method which can measure directly both apparent inductance and apparent Q of ferrite core coils simultaneously is described. A resonant circuit consisting of a coil to be tested and two capacitors in series, one of which is fixed and the other variable, is used to permit the direct readings of the inductance and Q by digital panel meters. A prototype instrument was built that could measure the inductance from 200 to 400 μH and Q values up to 400 at 796 kHz. The values of inductance and Q measured with the present instrument agreed with those measured with the conventional Q meter to within ±5 percent.