![]() Due to its physical size it is generally limited to power transmission frequencies up to around 100 Hz. In the iron vane type, the magnetic flux in the core directly affects a moving iron vane, allowing both AC and DC to be measured, and gives a true root mean square (RMS) value for non-sinusoidal AC waveforms. In this mode, the coil forms the primary and the test conductor the secondary. Usually, the injection probe is specifically designed for this purpose. This type may also be used in reverse, to inject current into the conductor, for example in electromagnetic compatibility susceptibility testing to induce an interference current. When measuring current, the subject conductor forms the primary winding and the coil forms the secondary. Like any transformer this type works only with AC or pulse waveforms, with some examples extending into the megahertz range. The conductor it is clamped around forms the other winding. A wire coil is wound round one or both halves, forming one winding of a current transformer. Types of current clamp Current transformer Ī common form of current clamp comprises a split ring made of ferrite or soft iron. ![]()
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