Functional Testing_

Functional Testing

FCT stands for Functional Testing, which is a crucial and final PCB assembly manufacturing step prior to integration of the PCB assemblies into complete systems. We provide PCBA functional testing service with our assembly services after circuit boards are assembled, SPI, AOI and visual inspection are finished. PCBA functional testing allows us to find and correct component failures, assembly defects or potential design issues at the early stage and make troubleshooting as quick as possible. Finally, customers can deliver a perfect product launching to the market in a short time frame.


Functional Testing provides a pass and fail determination on finished PCB assemblies before they are shipped out. The purpose of functional testing (FCT) in PCB assembly manufacturing is to validate that electronic hardware is free of defects that could, otherwise, adversely affect the product’s correct functioning in a system application.


In short, SMT functional testing verifies PCBA functionality and its behavior. It is important to emphasize that the requirements of a functional testing, its development, and procedures vary widely from PCB to PCB and system to system. A functional tester, functional testing jig, or functional testing fixture typically interface to the PCBA under test via its edge connector or a test probe point. This testing simulates the final electrical environment in which the PCB will be used.


Advantages of PCBA Functional Testing Service

PCBA functional testing simulates the operating environment for the product under testing thereby minimizing the expensive cost for the customer to provide the actual testing equipment.


It eliminates the need for expensive system tests in some cases, which saves the OEM lots of time and financial resources.


It can check the functionality of the PCB assembly product anywhere from 50% to 100% of the product being shipped thereby minimizing the time and effort on the OEM to check and debug it.

The testing engineers can extract the most productivity out of Functional testing thereby making it the most effective tool short of system test.


PCBA functional testing enhances the other types of tests such as ICT and flying probe test, making the product more robust and error free.

A functional testing emulates or simulates a electronic product’s operational environment to check its correct functionality. The environment consists of any device which communicates with the device under testing (DUT), for example, the DUC’s power supply or program loads necessary to make the DUT work properly.


The printed circuit boad (PCB) is subjected to a sequence of signals and power supplier. Responses are monitored at specific points to ensure functionality is correct. The test is usually performed according to the OEM testing engineer, who defines the specifications and test procedures. This test is best at detecting wrong component values, functional failures and parametric failures.


Testing software, sometimes called testing firmware, allows production line operators to perform Functional testing in an automatic way through a computer. To do this, the software communicates with external programmable instruments as a digital multi-meter, I/O boards, communication ports. The software combined with the fixture interfacing the instruments with the DUC make it possible to perform a Functional testing.


Rely on Us as the Turnkey PCB Assembly Provider China

Smart OEMs reply on a reputable Turnkey PCB assembly provider China, like SYS Tech, to include PCB assembly functional testing as part of its PCB manufacturing and assembly. A PCB assembly company adds considerable flexibility to an OEM’s technology storehouse. OEM customers can benefit greatly by working with a knowledgeable PCB assembly provider. The main reason is we draws from experience base and make valuable suggestions relating to different reliability techniques and standards.