(under subclass 546) Subject matter for checking a defect in a component of an electrical device, which transfers electric energy from one winding to another by electromagnetic induction, and gives a "go-no-go" type of indication.
(1) Note. This subclass includes, for example, the checking for excessive surge characteristics such as voltage, impulse produced failures, faults in insulation of windings, failure of insulating liquid, corone discharges, excessive moisture content of insulation, etc.
(2) Note. This subclass does not include the testing of transformer properties, e.g., the ratio of windings.
