Motor vehicle windscreen heater testing system in which an inductive sensor head is passed over the wires of the heater in order to detect inductive current peaks corresponding to each heater wire

摘要

Testing system for electrical conductors that are placed in screens, especially motor vehicle glass windscreens, whereby a voltage is applied to the conductors (3) and conduction of a current in each conductor is tested for using an inductive sensor. To test a whole heater system the number of induction current peaks is counted as a sensor is scanned over the parallel wires of the heater. The number of peaks is compared with the expected number that corresponds to the number of heater wires.