APPARATUS FOR ELECTRICALLY TESTING A COIL INCLUDING A PRIMARY COIL AND CORE, A PICK-UP COIL, AND LIMITED SUPPLY OF HIGH VOLTAGE D.C. FOR ENERGIZING THE PRIMARY COIL

摘要

A primary coil and a core are adapted to be magnetically coupled to a test coil. A pick-up coil is also within the magnetic couple and is electrically connected to a detection or indicating means. A limited supply of high voltage D. C. energy is provided by a capacitor bank. At least one silicon-controlled rectifier serves as a switch between the capacitor bank and the primary coil. The silicon-controlled rectifier is triggered through a four-layer diode with a capacitor in parallel with the four-layer diode providing a repetition rate of switching dependent upon its charging time. A defect, such as a shorted turn, in the test coil will be reflected through the magnetic couple and the pick-up coil to the detection means.