There are two main ways to test out a PCB that MJS Designs, Inc. uses: with flying probe tests and with universal grid testing. Both tests look for the same things – opens, shorts, resistance and capacitance – but how they test for them differs.
A flying probe test uses mobile sensors to examine the components on each printed circuit assembly. With the help of a two-axis system, they examine the board from top to bottom, while their probes test contacts and test points. The upside of this type is that it doesn’t require its own extra machine.
A universal grid test is done with its own machine is often seen as more accurate than a flying probe test. This is because a universal grid test uses two high resolution cameras, positioned at the top and bottom of the board, to scan the board. This allows tested to make minor adjustments if needed.