A Brief Introduction To Functional Testing Of Printed Circuit Board Assembly

TECOO aims to bring customers' products into the market, we will conduct a series of printed circuit board assembly tests after electronic assembly. In general, online testing can fully meet customer requirements, which is our guarantee for all outputs. However, the customer will also put forward some additional requirements, and we will test according to the customer's requirements, including functional testing, reliability testing, etc.

This time, let's talk about functional testing. Functional testing is also called behavioral testing. It is tested according to the characteristics of product description, user plan, and operation plan to ensure that the product meets the design requirements in both product description and operation plan. We just need to test all features and functions - from software product interfaces, test case architecture according to written requirements, input data evaluation between expected and actual results to ensure that the system meets requirements and specifications.

At present, the functional test of printed circuit board assembly is divided into the following categories:

◆ Manual test fixture

The manual test fixture uses a baking pan and acrylic needle board to output the input/output and power supply of the board under test, and manually simulate the input/output. The results are up to the tester to confirm the correctness of the output.

Features: The requirement for manual participation is low, the price is cheap, the test efficiency is low, and there is no way to guarantee the product quality

◆ MCU functional test

     Make a clamp lock or pneumatic clamp and pull the probe out. Then connect the input/output power supply to the microcontroller circuit, let the microcontroller run the test program to simulate the input, and measure whether the output is correct or not.

      The MCU function test fixture mainly has the following parts:

       1. Test fixture, extend the input/output interface of the product.

       2. MCU control board: judgment of the whole test process and test value. Input and output control. display control

       3. Signal source board: provide various signal sources required for testing

       4. Relay board: switch various input/output

       5. Measuring board: measure the output part of the product to judge whether it is good or not

       6. Display module: display test results and display test status, generally LCD and digital tube

    Features: The price of MCU functional test is moderate, the test efficiency is high, the test quality is guaranteed, and the human intervention is less. However, the versatility is not strong, and it is generally only suitable for machines with fixtures.

◆ Computer control test system

    Use pneumatic or automated testing facilities on the production line to test the quality of products through computer control.

    Features: The computer-controlled test fixture is more expensive, the test speed is fast, no human intervention is required, and the test is fully automatic. Good versatility, similar products can be used. Testing is relatively quick for quality assurance.

In the mass production process of printed circuit board assembly, due to various possible factors of equipment and operators, the quality of the produced circuit boards cannot be guaranteed to be all intact. This requires adding a variety of testing equipment at the end of production to ensure that the final delivery of the product to the customer meets the customer's expectations. TECOO has a variety of test equipment that can meet the testing requirements of most products on the market. Looking forward to your becoming our partner.