Abstract: An adapter (13) for a printed circuit board testing device (6), by means of which test contacts, (7) which are located in a grid, may be connected with test points (3), which are located in and/or beyond the grid, on a printed circuit board (2), which is to be tested, the connection being effected by means of adapter pins (14) which extend through first, second and third guide plates (10, 15 and 16), the third guide plate (16) being arranged between the first and second guide plates (10 and 15). The third guide plate (16) is arranged to be shifted square to the first and second guide plates (10 and 15) and guide holes (20) in the third guide plate (16) are provided at all points of the grid. The holes (20) have a diameter which tolerates a limited amount of clearance for steering of the adapter pins (14) in these guide holes (20).

Abstract: In a universal testing apparatus for electrical printed circuit boards in each case a quotient of test pins (26) covering a partial grid field is to be provided on one of several separable modules (27) which contains that part of the switch matrix which corresponds to this test pin quotient. Each module (27) is to be connectable electrically with other modules (27) and/or the control circuit part (32) of the apparatus. The apparatus also has a perforated grid plate (24) provided with guide holes (36) for the test pins (26), on which the modules (27) may be suspended so that the test pins (26) engage through the guide holes (36). Futhermore, the modules (27) are to be shaped so that they can be assembled in the form of building blocks in order to cover a partial area, corresponding to the printed circuit board (22) to be tested, of the total grid field defined by the perforated grid plate (24).