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How Does A Test Probe Work

Test-Fixture-Structure

A test probe works in a test fixture board mating a installed probe receptacle. The probe will contact the component on the PCB by compressed to a working travel, then the contact will keep the PCB signal go from probe to the terminal installed in Receiver board. 


According to components differeciation, fixture designer could select relative probe tips to match test points,  here is where you could refer to how to select a probe tip Tips-Selection.


In fact, a probe was made as a lead to contact bumps, dips and via holes to check PCB line open or short which was judged on Agilent ICT Tester. Large applied probes on test fixtures to check desktop, notebook and server print circuit boards in EMS ( Electronics Manufacturing Service) industries.

There are not only the probes on fixture, and the mated sockets or receptacles were tightly installed on the fixture board to keep a straight plug-in, and these receptacles are wrapped the wires to contact the terminals on the interface board, this is a systematic framework. The receptacle fits tightly with probe. Operators can maintain the probes by pulling out the useless probes, this will keep the test fixture a long life and save a lot.

 

    With the development of test, Pads become much smaller and higher density than before. So, it requires higher precision for probes and receptacles.



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