Abstract: The present invention relates to a method for locating a fault on a power transmission line which is series-compensated with capacitors. The site of the fault is determined with the aid of measured currents and voltages at one of the two ends of the power transmission line before and after the occurrence of the fault and a calculating algorithm based on impedance models of the power transmission line before and after the occurrence of the fault.

Abstract: A semiconductor device testing apparatus that has a laminate structure composed of a contact sheet having a first opening, an elastic sheet having a second opening and a base plate having a third opening. A supply voltage is applied to an external terminal located on a peripheral portion of the contact sheet. A probe of a probe portion is contacted to a signal electrode of a semiconductor device through the third, second and first openings.

Abstract: A printed circuit board tester includes an electronic analyzer and a grid pattern of contact points arranged in a regular pattern in a grid pattern plane. The contact points of the grid pattern are electrically connected to the electronic analyzer such that test points of a circuit board can be electrically scanned, whereby several contact points of the grid pattern are electrically interconnected. The circuit board is connectable to the contact points of the grid pattern by an adapter and/or a translator. The tester includes several grid bases, each of which comprises a contact point narrow side surface at which the contact points are arranged. The grid bases are provided with tracks, each of which is electrically connected to several contact points. Each track includes an electrical terminal connection leading to a terminal contact for connecting the electronic analyzer such that several contact points are electrically connected to a terminal contact.

Abstract: To perform broadband current detection. The current detector of the present invention comprises first terminal, which receives power source current; second terminal, which feeds output current to an outside current; third terminal, which outputs pilot current having a predefined relationship with this output current; and fourth terminal, which has reference potential; as well as first component connected between the first and second terminals; vertical connection of first and second baluns and coupled with the first component; grounded capacitive component at the connecting part of the first and second baluns; and grounded capacitive component at the output part of the second balun. The properties of the instrument for measuring impedance and the apparatus for measuring power are improved by using the current detector of the present invention.