| 摘要 |
FIELD: measurement equipment.SUBSTANCE: printed circuit board is fixed in a fixture, local load is applied to it perpendicularly to the printed circuit board surface with subsequent inspection of serviceability and determination of maximum displacement (bend) of the printed circuit board. Points of load application and a point with maximum displacement are determined by calculations according to envelopers of maximum values of movements from results of tests of a previously developed finite-element model of an instrument with a printed circuit board at all stages of regular operation, and the load value in each of selected points is determined in accordance with the formula. Selected points are loaded in series, controlling movements in other points, and if necessary, they increase movement in subsequent points, defining the maximum displacement in accordance with the formula. In the fixture for printed circuit board installation they provide for border conditions similar to conditions of printed circuit board fixation within the instrument.EFFECT: development of a universal method of testing for mechanical effect at electronic printed circuit boards with specified generalised load.2 cl, 4 dwg |
