Pcb Electrical Test Flying Probe

Pcb electrical testing types.

Pcb electrical test flying probe.

The flying probe testers originally evolved for use only for bare board testing and they have become the de facto standard for bare boards testing which involves testing for shorts opens etc. In the testing of printed circuit boards a flying probe test or fixtureless in circuit test fict system may be used for testing low to mid volume production prototypes and boards that present accessibility problems. Electrical probes located on each head make contact and test device vias and leads on the board to provide sequential access to the test points. In spite of the disadvantages mentioned flying probe test is still regarded as a significant test method as far as pcb fabrication and pcb assembly are concerned and will always play a crucial role in leading electronic products to excellent performance and high reliability.

A traditional bed of nails tester for testing a pcb requires a custom fixture to hold the pcba and the pogo pins which make contact with the pcba. Born about 30 years ago in the midst of general skepticism especially from electrical test engineers flying probe test systems are now considered worldwide as fundamental and essential tools to test all types of of electronic boards. Four to eight test heads move across the pcb under test at high speed. Pcb manufacturing facilities routinely perform electrical testing with flying probe testers which are well suited to smaller production runs.

This very reliable method of testing involves the use of a flying probe test sequence which probes the board at high speeds looking for shorts and openings throughout the board. For short runs the flexibility of quick set up ensures cost effective flying probe tests outperform the lead time cost and fixed designs of dedicated test beds. Flying probe can be performed without an expensive fixture as mentioned above. Between copper conductor features on the bare pcb where the main electrical parameter that is measured is the resistance between two points or nodes.

And we only charge one time on e test fixture cost but flying probe e test need re charge in all orders. Depending on moving probes to test electrical performance of each net on a bare circuit board flying probe tester is actually an upgrading version of bed of nails tester. The flying probe test may be cheaper at initial cost but the bed of nails fixture test is a higher cost effective for batch orders. This e test rule is applied in fr4 pcb flex circuit and rigid flex pcb and mcpcb.

Flying probe testing as well as the costs associated with them. With fixtures replaced by probes that can move at a high speed the min test pitch of a flying probe tester can be as small as 0 2mm.