Patent ID: 8736293
Filing Date: 2014-05-27
Classification: G01R

Abstract:
1. A test device, comprising: a base comprising a supporting surface for supporting a printed circuit board (PCB), the PCB comprising a back surface facing the supporting surface, the back surface comprising a circuited region and a non-circuit region, the circuited region forming a point, the PCB defining at least three through holes in the non-circuit region, the base defining at least three first threaded holes in the supporting surface corresponding to the through holes; at least three bolt sleeves for being interposed between the supporting surface and the back surface and engaging with the respective first threaded holes; at least three bolts for inserting through the respective through holes and the respective bolt sleeves, fastening the PCB to the supporting surface; and a measuring device comprising a pin inserting between the base and the PCB and capable of measuring the point upon a condition that the pin contacts the point and an included angle between the pin and the back surface larger than a predetermined angle, wherein if the included angle is smaller than the predetermined angle, the pin contacts the back surface at more than one point to cause the measuring device operating in an unreliable manner; the distance between the supporting surface and the back surface satisfying: where H is the distance between the back surface and the supporting surface, L is the maximum length of the orthogonal projection of the pin on the back surface when the pin contacts the point and rotates about a direction that is perpendicular to the back surface, and θ is the predetermined angle.