Eddy current probes for quality control PRINTED CIRCUIT BOARD

摘要

Eddy current converter PCB quality control is designed for non-destructive testing method for measuring the eddy currents, concentrated in the region of the transition pad to the opening of the printed circuit board and improve the reliability of the metallization quality. Eddy current converter consists of two flat T-shaped plate of a dielectric or a weakly magnetic material. Plates Tshape vzaimnosovmescheny axially to each other at an angle of 90 °, and each turn of mutually independent windings microwire is made as a T-shaped loops extending along the rack plates and alternately covers corresponding rungs branch plates. Upon excitation windings converter sinusoidal current creates a magnetic field which induces eddy currents. Eddy currents are concentrated in the transition between the metallized pad and the hole in the printed circuit board that allows you to control the metallization defects and, therefore, increases the reliability of printed circuit boards control.