FCT (Functional Test) refers to a testing method that provides a simulated working environment (excitation and load) for the test target board (UUT: Unit Under Test) to work in various design states, obtain parameters for each state, and verify the functionality of UUT. In short, it is to load appropriate excitation to UUT and measure whether its output response meets the requirements. Generally refers to the functional testing of circuit card components.
PCBA functional testing includes the following points.
1. Power test: Test whether the power supply is working properly; Test the voltage at each point
2. Port (interface) testing: testing for short circuits or open circuits that may cause functional abnormalities.
3. Special function testing (different boards have different requirements for special function testing)
2. Composition of functional testing system
system control center
This part is generally composed of small and medium-sized central processing units such as PCs, MCUs, ARM, etc. Its main function is to control the progress of the entire testing process, judge and record the testing content of each step, and finally obtain the test results. It is the core brain of the entire testing system.
Control and Execution
The control and execution part is mainly composed of I/O components, which are the induction and execution mechanism of logical actions in the testing process. The functional testing system uses it to build various testing environments and achieve testing functions.
PARAMETERS
The measurement part is mainly composed of some boards and instruments used for measurement, mainly responsible for collecting various analog or digital quantities during the experimental process, so sometimes we also refer to it as the data acquisition part.
Data processing and output
The test results of each step and the final test results are the purpose of our entire testing. Data processing and output are responsible for storing and outputting these results and data, which makes it more convenient for us to effectively control the quality of PCBA products.
PCBA electrical characteristic testing
PCBA electrical characteristic testing mainly includes the following aspects.
1. Current test: This test detects whether the circuit board has current exposure issues. If the current is lower than the design specifications, the test passes.
2. Voltage test: Test the withstand voltage capability of the circuit board by gradually increasing the voltage. If there is no malfunction in the circuit, the test passes.
3. Impedance testing: Impedance is an important parameter for testing circuits and components, referring to the resistance of components or circuits to current passing through them. Generally, an ohmmeter is needed to test impedance, and if the impedance value is within the specified range, the test passes.
Reliability testing
The ICT testing, FCT testing, aging testing, fatigue testing, and harsh environment testing discussed above all belong to reliability testing.
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