METHOD AND DEVICE FOR ELECTRICALLY TESTING PRINTED CIRCUITS

摘要

1. Method of testing wiring supports, such as printed circuit boards, ceramic circuit boards, printed circuits and flexible circuits, wherein in one processing step the conductivity of the conductors (1") located on the circuit board (1) is determined by measuring the conductivity between connection points (1') which are located on a specific conductor (1"), and wherein in other processing steps the insulation resistance between conductors (1") is determined by measuring the current flowing between a specific conductor (1"), and the other conductors (1"), a first electronic switch (4) and a second electronic switch (8) being associated with each connection point (1') of the conductors (1") and, in the one processing step, a connection point (1') of a specific conductor (1") being connected to a first potential by the first electronic switch (4) associated with the connection point (1') and another connection point of the specific conductor (1") being connected to a second potential (Vcc ) by the second electronic switch (8) associated with this other connection point and by a current measuring element (6), and, in the other processing steps, by means of a second electronic switch (8) associated with a connection point (1') of a specific conductor (1") and by means of the current measuring element (6) a connection being established with the second potential (Vcc ), substantially all of the other connection points (1') of the specific conductor (1") being isolated from the first and second potential (Vcc ), and a connection point (1') of the other conductors (1") being connected to the first potential by the first electronic switch (4) associated with it and substantially all the connection points (1') of the other conductors (1") being isolated from the second potential (Vcc ), with the electrical connections between the connection points (1') and the corresponding first and second electronic switches (4, 8) being established in each case by means of test pins (2') of an adaptor device (2) and by means of a contact bank (3, 30, 55) having contact elements (3, 30', 52), characterised in that, prior to carrying out the other processing steps, a device (7; 20', 20", 21', 21", 53) produces the effect that in each conductor (1") substantially all the connections to the connection points (1') of the conductor (1") except for the said one connection between the one connection point (1') and the second potential (Vcc ) are mechanically interrupted.