D.E.V.I.C.E. is an encyclopedia of terms used by manufacturers of test and measurement equipment. T&M Atlantic created this service to better explain the functionality of instruments it offers, and to highlight the latest developments in the world of measurement equipment. We are using such tools as animation to bring words and pictures to life and to create not just an understanding but also an appreciation for technology that goes into the design of every instrument.
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Clamp meter is a sort of measuring instrument, multimeter, which is equipped with a measuring sensor to measure current. Such a sensor provides a noncontact method of current measurement which is based on the measurement of the magnetic field around a conductor with current. AC strength can be judged by the intensity of current magnetic field which forms when current flows through a conductor. Clamp meters are very useful for noncontact measurement of current in a separate conductor located in a wiring harness. Thereto close the clamps around the needed conductor.
Current clamps are based on split core transformer, Hall sensor, a flexible magnetic conductor or so-called Rogowski coil.
Hall sensor used in clamp meters
Clamp meter construction based on two Hall sensors.