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ICT fixtures are fixtures that are designed to interface with a test platform.  Typically these platforms are made by Teradyne, Checksum or Keysight.  There are also many systems that have been created throught the years and are still in operation all over the world.  Aspen Test specializes in the Teradyne fixtures.  These fixtures have contact pins that interface with the unit under test (UUT) and route the signals through small wires to the test platform.  This platform contains all of the overhead required to test the board in question (power supplys, signal analyzers, ohmmeters etc).  The platform has a specific program that handles the specific testing that can be done.  We have found over 35 years of board testing that this is the most efficient, fastest and robust way to test printed circuit boards.  We also feel that the Teradyne system is the best system for accomplishing this task.  Many CMs already have the system so the cost associated with this method is only the cost of the fixture and programming without any of the overhead (this overhead includes the aquisition of computers and DAQ along with the custom programming that must be done to faciliate the functional fixture operation when creating functional test fixtures as opposed to ICT fixtures.