Measurement of inductances can be made from subsonic to ultrahigh frequencies with a
variety of means. Meaningful measurements can be made over the range of nanohenries
to kilohenries but not at the same frequency. Circuits used to characterize inductances
were introduced in Section 5.1, and audio-frequency inductance-measuring bridges were
described in Section 5.5.2. Audio-frequency bridges are the most accurate means of measuring
inductance at audio frequencies. In this section, we will describe two other means
of measuring inductance: the AC voltmeter method and the Q meter. Inductances can
also be measured with vector impedance meters (VIM), described in Section 8.10 in the
following.