An ATE system, short for «Automated Test Equipment», is a setup that applies stimulus to a circuit board or unit under test and automatically checks the response against expected values, without an operator manually probing each point. The goal is simple: replace a slow, error prone manual test procedure with one that runs the same way, at the same speed, every single time.
Why manual testing does not scale
A skilled technician with a multimeter and an oscilloscope can certainly find a fault on a circuit board. What that approach cannot do is scale: it is slow, it depends on the individual technician's experience, and it produces results that are hard to compare consistently from one unit, or one shift, to the next. An ATE system runs the same test sequence in the same order every time, which is exactly what a production line, or a fleet maintenance program, actually needs.
The three broad families of board level test
«In-circuit test» (ICT) accesses individual components directly through a bed of nails fixture, checking each part largely in isolation from the rest of the circuit. «Functional test» exercises the board as a complete, working system, applying realistic inputs and checking realistic outputs, closer to how the product will actually be used. «Flying probe» systems use moving probes instead of a fixed fixture, trading some speed for the flexibility of testing a board with no dedicated fixture at all, which suits low volume or frequently changing designs.
Troubleshooting versus production test
Not every ATE system lives on a production line. Systems such as the Astronics ETS FaultFinder are built for field and depot level troubleshooting, condensing the diagnostic capability of a full test bench into a portable system that a maintenance technician can use to isolate a fault on a circuit card, without needing the original production test fixture.
When ATE actually pays for itself
The economics depend on volume and the consequence of failure, not on the up front cost of the fixture alone. High volume production, and any application where a field failure is expensive or safety critical, such as Defense and Aerospace electronics, are exactly where consistent, automated test coverage earns back its cost many times over.
ALLdata's role
ALLdata specifies and integrates ATE solutions across in-circuit, functional, flying probe, and field troubleshooting applications, matching test coverage and throughput to the actual volume and reliability requirements of a program.
Weighing whether to invest in automated test coverage for a new board or program? Talk to an ALLdata engineer, or browse our ATE and test automation range.