Testing of Printed Circuit Boards
Original Publication Date: 1985-Mar-01
Included in the Prior Art Database: 2005-Feb-18
Printed circuit boards (PCBs) consisting of several planes are tested for short-circuits. Generally, a test voltage is applied to the several inner planes, and the resultant current is measured. If this current exceeds a certain limit, the PCB may be damaged. To avoid this, it is known to suitably limit the test current. During testing, the illustrated device measures and regulates the power dissipation in the plane being tested to ensure that a desired reference value is not exceeded. This has the advantage that the PCB is not destroyed and that a particular power is dissipated at the location of a short-circuit, thus producing an increase in temperature which can be detected by an infrared camera. The illustrated testing device comprises a power supply 1 applying a particular voltage to the PCB plane being tested.