FCT（功能测试）它指的是对测试目标板(UUT：Unit Under Test)提供模拟的运行环境（激励和负载），使其工作于各种设计状态，从而获取到各个状态的参数来验证UUT的功能好坏的测试方法。简单地说，就是对UUT加载合适的激励，测量输出端响应是否合乎要求。一般专指PCBA的功能测试。(FCT (Functional Testing) refers to a test method that provides a simulated runtime environment (incentive and load) to the test target board (UUT: Unit Under Test) to work in various design states, thereby obtaining parameters of each state to verify the performance of UUT. To put it simply, it is loading the appropriate excitation on the UUT and measuring whether the output response meets the requirements. Generally refers to the functional test of PCBA.)