Automatic test equipment performs complex tests on printed circuit boards, integrated circuits and other electronic devices. The testing usually takes place in a production environment where automated, relatively high-speed testing is important. Automatic testing equipment can use a variety of techniques, including functional circuit testing, optical examination and X-ray inspection. It is frequently used by semiconductor manufacturers to test microprocessors, memory chips and analog integrated circuits. Automated test equipment is also used by electronics manufacturers to verify the correct operation of circuit boards, avionics systems and electronic components.
An automatic test equipment device can be quite simple, performing just a few voltage and current measurements on the part being tested. Other systems are very complex, performing dozens of functional and parametric tests with a variety of test instruments. Some can vary the physical environment of the part being tested as well. For example, a device may be tested inside a chamber that is subjected to extreme heat or cold under computer control. Depending on the nature of the device, testing may also involve exposure to a range of light, sound or pressure.
