Abstract: Disclosed is a media rotation mechanism. The media rotation mechanism may include a housing, a media receiver, and a rotation motor. The housing may define a first opening and a second opening. The media receiver may define a media receiver opening. The rotation motor may be configured to rotate the media receiver between a first position and a second position. The first position may correspond to the media receiver opening facing the first opening. The second position may correspond to the media receiver opening facing the second opening.

Abstract: Disclosed is a media rotation mechanism. The media rotation mechanism may include a housing, a media receiver, and a rotation motor. The housing may define a first opening and a second opening. The media receiver may define a media receiver opening. The rotation motor may be configured to rotate the media receiver between a first position and a second position. The first position may correspond to the media receiver opening facing the first opening. The second position may correspond to the media receiver opening facing the second opening.

Abstract: A coreless current probe has a body defining an opening. A conductor carrying a current to be measured can be accommodated in the opening. At least three coreless single point magnetic field sensors are distributed in or on the body around the opening. The sensors are arranged so that the sum of the outputs each with appropriate weighting is zero in any homogenous field and with no enclosed current. The sensors outputs have differing weightings so as to maximize rejection by the probe of external magnetic fields.

Abstract: A coreless current probe has a body defining an opening. A conductor carrying a current to be measured can be accommodated in the opening. At least three coreless single point magnetic field sensors are distributed in or on the body around the opening. The sensors are arranged so that the sum of the outputs each with appropriate weighting is zero in any homogenous field and with no enclosed current. The sensors outputs have differing weightings so as to maximize rejection by the probe of external magnetic fields.

Abstract: A coreless current probe has a body defining an opening in a plane and a central line through the opening which is normal to the plane. A conductor carrying a current to be measured can be accommodated in the opening. At least three coreless single point magnetic field sensors are distributed in the body around the opening. The linear spacings between adjacent sensors around the opening are not all the same. In another embodiment, the sensors are not all located on a common cylindrical surface. One embodiment has a U-shaped body enabling engagement with a current carrying conductor. The sensors are arranged so that the sum of the outputs each with appropriate weighting is zero in any homogenous field. The sensors outputs have differing weightings so as to maximize rejection by the probe of external magnetic fields.

Abstract: A coreless current probe has a body defining an opening in a plane and a central line through the opening which is normal to the plane. A conductor carrying a current to be measured can be accommodated in the opening. At least three coreless single point magnetic field sensors are distributed in the body around the opening. The linear spacings between adjacent sensors around the opening are not all the same. In another embodiment, the sensors are not all located on a common cylindrical surface. One embodiment has a U-shaped body enabling engagement with a current carrying conductor. The sensors are arranged so that the sum of the outputs each with appropriate weighting is zero in any homogenous field. The sensors outputs have differing weightings so as to maximize rejection by the probe of external magnetic fields.

Abstract: A coreless current probe has a U-shaped body with arms, an open end and a cross piece forming a closed end. The opening formed in the U-shaped body has a length not less than the width between the arms. The U-shaped body can engage around a conductor carrying a current to be measured. The U-shaped body has a number of coreless single point magnetic field sensors, usually Hall devices, distributed around the opening. An arrangement with six sensors has two sensors at the ends of the arms of the U-shaped body, two sensors at the closed end, and two sensors mid-way along the arms. Sensing circuitry applies factors to the outputs of the sensors and sums the results to produce a measured current value. The factors are selected so that the summed result is zero in any externally generated homogeneous magnetic field.

Abstract: The invention concerns a current transducer for measuring a current flowing through a cable, comprising at least one magnetic field sensor and an electronic circuit. The current transducer comprises a head with a ferromagnetic core optimized to reduce the effects of external magnetic fields. The invention further concerns a magnetic transducer comprising a magnetic field sensor and an electronic circuit. The electronic circuit comprises at least one current source, a transformer, a fully differential preamplifier coupled to the transformer, a phase sensitive detector coupled to the preamplifier and a logic block configured to operate the magnetic field sensor(s) to provide an AC output voltage. The magnetic field sensor(s) is preferably either a Hall element or an AMR sensor or a flux-gate sensor.

Abstract: The invention concerns a magnetic transducer comprising a magnetic field sensor and an electronic circuit. The electronic circuit comprises at least one current source, a transformer, a fully differential preamplifier coupled to the transformer, a phase sensitive detector coupled to the preamplifier and a logic block configured to operate the magnetic field sensor(s) to provide an AC output voltage. The magnetic field sensor(s) is preferably either a Hall element or an AMR sensor or a fluxgate sensor. The invention further concerns a current transducer for measuring a current flowing through a cable, comprising at least one such magnetic transducer and a head with one or more ferromagnetic cores optimized to reduce the effects of external magnetic fields.