Synthetic stone PCB test fixture
　　The fabrication of synthetic stone PCB test fixture should select appropriate materials according to the actual situation, so as to standardize the fixture fabrication, improve the quality of the fixture and reduce the cost of the fixture.
　　The boards used in PCB fixture test rack generally include synthetic stone, acrylic, epoxy resin board, etc. Synthetic stone is a new type of board developed in recent years. It has the characteristics of high temperature resistance, no deformation, no blistering, no fuzzing, and no layering. It can be repeatedly used for about 15000 times, and the price of synthetic stone is moderate. At the same time, when the synthetic stone is relatively soft, there is a tight combination between the expansion and contraction probe sleeve and the hole. Because the quality of the tools made of synthetic stone is excellent and the cost is not high, most customers will choose synthetic stone materials to make test tools. Synthetic stone materials will not melt or break the drill bit no matter whether the hole diameter is large or small, because the toughness and rigidity of synthetic stone are very good.
　　The selection of plates plays a vital role in the quality and accuracy of the whole testing fixture.