Moreover, the circuit testing is traditionally used on
mature products, especially in subcontract manufacturing. The ICT test fixtures define as a
bed-of-nails test fixture mostly used to access multiple test points on the
PCB’s bottom side. With sufficient access points the ICT can use to transmit
the test signal into and out of the PCBs at high speed for performing the evaluation
of components and circuits.
The test fixtures can be used as a traditional electronic
test fixture. It has numerous pins inserted into holes, which are aligned using
tooling pins to make contact. With the test points in an ICT test fixtures work as a printed circuit board and also connect
to a measuring unit with wires. These ICT testing devices contain an array of
small and spring-loaded pogo pins making contact with one node in the circuitry
of the device under test.
A reliable contact can be
made quickly with hundreds and in some cases thousands of individual test
points within the circuitry. Devices that have been tested on an ICT test
fixture may show a small mark or a dimple which comes from the sharp tips of
pogo pins used in the fixture. It takes a few weeks to create the ICT fixture
and do its programming. The ICT test fixtures
can either be vacuum or press-down. The vacuum fixtures give a better signal
reading versus the press-down type. On the other hand, vacuum fixtures are
expensive because of their high manufacturing complexity.
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