Abstract: In an image reading apparatus which scans an image while displacing the relative position between the image on a predetermined medium and an image sensor, and sequentially transmits the read image data to an external device, when image reading operation of an image reading unit suspends, the relative position between the image and the image sensor is displaced to a predetermined position before the suspended position of the image reading operation, and reading operation restarts from the displaced position.

Abstract: In an image reading apparatus which scans an image while displacing the relative position between the image on a predetermined medium and an image sensor, and sequentially transmits the read image data to an external device, when image reading operation of an image reading unit suspends, the relative position between the image and the image sensor is displaced to a predetermined position before the suspended position of the image reading operation, and reading operation restarts from the displaced position.

Abstract: According to the invention, there is provided an apparatus for monitoring degradation of insulation of an electrical installation that can constantly monitor its electric equipments and cables for degradation of insulation under hot-line conditions.

Abstract: A method of and apparatus for the detection of insulation deterioration in an electrical power supply system utilizes the detection of a progressive wave generated by a corona discharge or partial discharge due to such insulation deterioration. Sensing of said progressive wave may be effected by an apparatus comprising: a first coil having two primary windings, wound with the same number of turns and in the same direction, and a secondary winding, the primary and secondary windings being wound on a core whose magnetomotive force and magnetic flux density are roughly proportional to each other; a second coil composed of a primary winding and a secondary winding both wound on a core whose magnetomotive force and magnetic flux density are roughly proportional to each other; and an impedance circuit.

Abstract: A signal discriminator adapted to discriminate a signal with a specific frequency out of a current composed of two or more superimposed components with different frequencies. One type of signal discriminator disclosed includes a first coil composed of a primary and a secondary winding wound with the same number of turns and in the same direction on a core whose magnetomotive force and magnetic flux density are roughly proportional to each other, a second coil composed of a primary and a secondary winding wound on a core whose magnetomotive force and magnetic flux density are roughly proportional to each other, and an impedance circuit. Another type of signal discriminator is composed of a first winding with short-circuited ends and a second winding for detecting signals both wound on an annular core having an approximately linear BH characteristic with the magnetomotive force and the magnetic flux density roughly proportional to each other.