1. An instrument which uses electronic devices; such as, amplifiers and limiters, to change an A.C. voltage into square waves before measuring its phase angle.
2. A phasemeter or a device for measuring the difference in phase of two alternating currents of electromotive forces which makes use of electronic devices; such as, amplifiers and limiters, that convert the alternating-current voltages being measured into square waves whose spacings are proportional to phase.

The limiters mentioned in the above definitions refer to electronic circuits that are used to prevent the amplitudes of electronic waveforms from exceeding specified levels while preserving the shapes of the waveforms at amplitudes less than the specified levels.

Also known as amplitude limiters; amplitude-limiting circuits; automatic peak limiters; clippers; clipping circuits; limiter circuits; and peak limiters.