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Premo has introduced new HCT series sensing device to measure AC and DC currents. The new Hall effect technology in semiconductors allows converting the magnetic field B, usually created in a magnetic core by the current to be measured, in a voltage signal proportional to it. This effect happens for DC and AC signal of the magnetic field. Based on the Hall effect, the output voltage is proportional to the density of magnetic flux, and this principle permits to reproduce the waveform of the current that induces the density of magnetic flux in a magnetic core. Output voltage signal of the Hall sensor element (semiconductor), that makes the transduction, is conditioned and amplified electronically to measure properly this output signal. The Hall principle and the signal conditioning circuits have permitted the existence of two kind of operating principles of measuring with this transducers. First is the open-loop operating principle -in this principle, the current about to measure, magnetises the magnetic gapped core. In the gap of this magnetic core, is placed the Hall sensor element (semiconductor) that senses this induced density of magnetic flux, transforms this in a voltage output that is conditioned. Therefore, the output signal of the transducer is voltage and its typical frequency bandwidth. The second is the Closed-Loop operating principle - this working principle is similar to the open-loop case, the difference is that the output signal of the Hall sensor element is involved in a circuit where a current is created and applied on a winding, placed in the core that compensates the density of flux induced by the current to be measured. Therefore the output signal is a current signal. Electronic circuit involved in this process, permits an advanced featuring of electric parameters than open-loop principle (accuracy, linearity, offset, thermal drift, hysteresis error, frequency bandwidth).