FCT functional test fixture is a kind of used to test semi-finished products / a process finished goods or in the production process, in order to determine whether the object to be measured to mechanical auxiliary equipment initial designers aim, function test fixture used in analog, digital, memory, RF and power supply circuit, the functional test fixture each form corresponding to the required. Functional test fixture capable of detecting a large number of practical important pathways and verification, make sure no hardware error, to make up for the missing part of the testing process. This will need a large number of analog / digital excitation has added to the unit under test (UUT), while monitoring the same number of analog / digital response, and full control of its implementation. Functional test fixture can be used at different stages of life cycle of product manufacturing, first is the project development stage, confirm the new product function in the system before production verification; then must also be in production, as a part of the whole process, reduce the cost of defects found by testing the system expensive (omitted cost); finally, shipment stage is indispensable in the shipment, it can reduce the cost of repair in the application site, ensure the normal function and won't be back.