Scratch test apparatus for testing electrical components that have protective coating has pin which moves back and forth in holder

摘要

The apparatus has a scratching pin with a conical end having a defined angle of flare and a tip of defined radius. A pin holder (9) is movable in two directions between adjustable limit stops. The pin (10) is held in the older by guide rollers (8) arranged in a triangle. An electronic controller (14) is connected to a motor (7) which moves the pin holder to and fro via a drive shaft in the form of a threaded rod. An incremental sensor (6) in the form of position encoder disc is arranged on the threaded rod. Guide wheels (11) for the pin run on a shaped aluminium profile piece (4). An opening (12) is provided in a baseplate (15) on which the scratch test apparatus is mounted for testing transformers or other electric components.