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In-circuit test (ICT)

  • test method for electronic assemblies and assembled printed circuit boards
  • checking for defects in the conductor routing and for component defects
  • detection of interruptions and short circuits
  • still widespread, since in principle all electrically detectable faults can be found

In combination with other test methods such as automatic optical inspection (AOI), well over 90 percent of all errors can be detected. Grundig Business Systems also offers the in-circuit test for its EMS customers.

This is how the in-circuit test works

In the in-circuit test, specially designed test points on the circuit board are brought into contact with fine, springy test needles. The connection often takes place using a vacuum or compressed air. By touching the circuit board, an electrical circuit is closed, with the help of which the in-circuit test carries out the test of the components.

The measures that have to be taken prior to an in-circuit test are often complex because a specific test needle adapter has to be manufactured for each test object. This lies with its measuring needles exactly on the test points of the circuit board. Even if there is only a minimal deviation in the PCB structure, the adapter must be revised in order to be able to carry out the in-circuit test.