How to select and make PCB test fixture materials

We should choose the materials of PCB test fixture according to the actual situation, not only to reduce the production cost, but also to give better play to the function of test fixture, make the test production more convenient and improve the test quality.

Tips for selecting materials for making PCB test fixture:

1. Selection of PCB test fixture test line: at present, the test line is mainly imported from abroad and is produced in Taiwan and Hong Kong. There is little difference between them. The market price is about 125 a roll.

PCB test fixture

2. Selection of test plates: the plates selected in PCB test fixture generally include acrylic (plexiglass), epoxy resin plate, etc. Ordinary fixtures with probe aperture larger than 1.00mm are mostly made of plexiglass, which is cheap. At the same time, plexiglass is relatively soft. When drilling, there is expansion and contraction, and the probe sleeve is closely combined with the hole. Because plexiglass is transparent, it is very easy to check the problem of fixtures.

However, the epoxy resin board PCB test fixture is not transparent, so once there is a problem with the PCB test fixture, it will be difficult to check the problem. Therefore, generally, we use acrylic (plexiglass) as the test plate. If the test density is very high, the epoxy resin board needs to be used, and the selection of the plate plays an important role in the accuracy of the test fixture.