Eagle Test Systems, Inc engages in the design, manufacture, marketing, and service of automated test equipment for testing analog, mixed-signal, and RF semiconductors. The company's products are used to test power management devices, wireless devices, battery management devices, ADSLs, display drivers, data converts, consumer audio devices, temperature sensors and fan speed controllers, smoke detectors, disk drives, sense amps, servo controllers, automotive devices, BUSS devices, clock drives, amplifiers, and precision voltage references that are used in consumer electronics, automotive, computing, telecommunications, and defense and aerospace industries. It serves semiconductor manufacturing companies, including integrated device manufacturers, assembly and test subcontractors, and fables design companies. The company was formerly known as Systems Sales, Inc. and changed its name in September 1980. Eagle Test Systems, Inc. was founded in 1976 and is based in Buffalo Grove, Illinois. As of November 14, 2008, Eagle Test Systems, Inc. operates as a subsidiary of Teradyne Inc.