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What Is a Flying Probe Test?

The flying probe test is a standard testing method for inspecting PCBs. Often compared to in-circuit testing (ICT), it remains a popular choice due to its accuracy and flexibility.
Unlike ICT, which requires a specially designed fixture, a flying probe tester uses probes (or “needles”) to test specific points on the board without powering up the circuit. This test evaluates multiple parameters, including:

  • Resistance
  • Capacitance
  • Inductance
  • Opens (disconnected circuits)
  • Shorts
  • Diode checks
  • Limited functional tests

For many projects, the flying probe machine can handle a range of testing needs quickly and accurately, making it a valuable alternative to ICT, especially for low- to medium-production volumes.