Appts. for measuring resistance, resistivity or cross-section area - of electrical conductor uses return conductor connected to cable end, applied AC voltage gauge

摘要

The measuring apparatus comprises a very low frequency sinusoidal voltage generator (1) which feeds a winding of a toroidal core (2) placed around a strand (3) of conducting wires to be measured. This toroidal core (2) includes a removable pole piece whereby the core (2) can be opened to able it to be placed about the strand (3), and then closed by replacing the pole piece. A loop, which allows a current to be set up, is provided by fixing a conductor (4) at two points on the strand (3) by means of two connectors (5). Two contact points (6a and 6b) borne by a rule, with a fixed distance between them, are applied to the strand (3) which is held straight. A current can be induced in the strand (3) for a sufficiently short period to avoid any heating of the strand.