Testing of Printed Circuit Boards

Present methods of testing printed circuit boards include pins in a bed of nails fixture, or other techniques which are fairly expensive. According to this invention, the printed circuit boards are tested by the scattering of electromagnetic radiation caused by the conductors on the board. An analysis of the effects of scatter therefore indicates the geometry of the conductors. According to the figure, a transmitting antenna 10 coupled to a radio transmitter 11 is placed between two printed circuit boards 12 and 13. One board is known to be without flaws, while the other is the board to be tested.