Can you name several common soldering circuit board testing instruments? Let's reveal the answer. The ICT online tester, FCT operation testing, and aging testing constitute the equipment for PWB assembly testing.

ICT has the advantages of wide application range and simple operation, and is highly praised. To achieve the purpose of detecting open circuits, short circuits, component damage, etc., it is indeed necessary to have the help of this effective testing method. In addition, it can accurately locate the fault location for easy maintenance.

Generally speaking, products that pass ICT testing can be transferred to functional testing. FCT functional testing mainly tests the corresponding functions of each product to determine whether the product is in good condition. More specifically, it refers to a testing method that provides a simulated operating environment for the testing target printed circuit board, allowing it to run in various design states and obtain parameters in each state to verify the functionality of the testing target printed circuit board.

Aging testing generally simulates the external environment on the finished circuit board with assembled components. It simulates the daily use environment of the product through the comprehensive effects of high temperature, low temperature, high and low temperature changes, and electrical power. Defects in the assembly of the circuit board, such as poor soldering, inconsistent component parameters, and faults caused during debugging, are eliminated and improved to stabilize the parameters of the defect free PCB assembly board. PCBA boards that are consistent with electronic products are subjected to long-term simulation of consumer use for input/output testing to confirm their performance meets market demand.

These three types of testing instruments are common in the PWB assembly process. Our company Viasion attaches great importance to circuit board testing in the assembly and processing of circuit boards. Therefore, the customer has provided feedback that the PCB assembly we delivered fully meets the requirements. In addition, the repair rate of our products has also been greatly reduced.

PCB soldering test fixture is an important testing instrument in PCBA process factories, usually placed at the end of the assembly process to test whether the product is intact. When making and testing PCB assembly test fixtures, it is necessary to meet the required requirements to improve the accuracy of testing and enhance delivery quality.

Circuit board assembly testing fixture is a specialized fixture used to test and inspect the operation, power, lifespan, performance, etc. of products. Therefore, it is mainly used for testing various indicators of products on PCB assembly lines, and is also known as printed circuit assembly testing fixture.

In Circuit Testing (ICT) mainly includes circuit on-off, voltage and current values, fluctuation curves, amplitudes, noise, etc.

2. The purpose of FCT testing is to identify boards with assembly defects. By simulating the full functional testing of boards when assembled into a complete machine, all possible defects that may exist before the circuit board is assembled into the whole machine can be identified, avoiding the waste of time and material loss caused by disassembling and reassembling the entire board after assembly.

3. Fatigue testing is responsible for sampling high-frequency and long-term PCB assembly services to observe whether products have malfunctioned. Undoubtedly, the probability of failure occurring during the experiment can also be well judged. Another point to note is that it can provide good feedback on the operational performance of circuit boards in electronic products. This allows us to make timely adjustments to the problem.

4. Harsh environment testing is specifically conducted on PCBA boards to test for extreme temperatures, humidity, drops, splashes, vibrations, etc., and obtain test results from random samples to infer the reliability of the entire batch of PCBA board products.

5. Aging testing is a specialized method for testing the aging of electronic products. After mass sales, the circuit board assembly board and electronic products are powered on for a long time, kept running, and observed for any faults.

1. According to the testing requirements and test board, after selecting the control mode, the fixture structure type is determined, and the load board, pressure plate, and instrument module are designed. The fixture load board/pressure plate is inexpensive.

2. The fixture should be positioned correctly, and the instrument binding should be smooth.

3. The layout cost of the fixture box is low, saving wiring and installation in the system area.

4. Fiber optic/MIC/SPK/SIM card analog slots should be reserved and positioned accurately.

5. The reserved interface positions for fixtures should be correct, sufficient, and reasonably arranged.

6. The lock of the lighting fixture box should be in the form of a box buckle or pressure buckle for easy replacement and maintenance.

7. Correct zero point correction. The zero drift of the testing fixture will be corrected with changes in testing conditions or the replacement of different testing fixtures, so zero correction for open circuits and tangents is very necessary. Therefore, the FCT test fixture has circuit and tangent correction settings.

Once the fixture breaks or ages, the needle should be replaced for repair and continued to be used. If the fixture breaks after repair and the customer no longer uses it, it must be remade.

Printed circuit assembly testing fixtures are sometimes customized for selected products, which can effectively improve productivity and transportation quality.

The production method of PCB batch testing fixtures is as follows:

1. Select the final fixture control method based on the tested product and customer testing requirements, and design the pressure plate, load plate, and conversion module.

2. The position of the clamping plate or load plate inside the specimen should be correct, and the test piece should not be pressed onto the test plate.

3. The positioning of the testing fixture should be correct, and the instrument binding should be smooth.

4. The test fixture can have a precise box style, and the test product should be placed inside the box style. The internal style of the fixture should reserve sufficient area in the box, and the box layout should be cheap.

5. The reserved interface positions for testing fixtures should be correct, sufficient, and reasonably arranged.

After the PCBA test fixture is formed, simply swing the PCBA board into the test fixture to complete the positioning of the PCBA board and the test fixture. The accuracy of positioning is closely related to the manufacturing process of the test fixture.

To confirm the integrity and accuracy of the product and avoid excessive rework caused by assembly processes and operating methods, PCBA manufacturers can use PCBA testing to solve problems. However, the industry also emphasizes that PCBA testing is not omnipotent, and there are still several areas that need to be noted in the actual operation process.

In PCBA testing, the following aspects should be noted:

When PCBA needs to be upgraded, most motherboards will undergo significant changes. Industry insiders emphasize that traditional batch production of PCBA motherboards from different periods cannot be mixed with after-sales motherboards, because once mixed batch production occurs, it is easy to run into mixed batch boards, which is detrimental to the later use of electronic products. Therefore, when testing and assembling PCBA, it is important to determine whether the final usage code meets the customer's requirements.

●Before PCBA testing and assembly, the dirt on the fingers should be removed first. It is best to wipe them with dust-free material and alcohol, and then do so again to avoid the user's hands being unable to perform certain key operations on the circuit card due to these dirt.

●Anti static measures must be taken, whether it is PCBA testing and assembly or other processes. The purpose of this step is to avoid poor contact or power on of electronic products during use, thereby improving product quality and user experience.

This section mainly includes testing of circuit switching, current value, voltage, amplitude, noise, etc., to check whether PCB manufacturing and assembly are normal.

Its purpose is to test the entire PCBA circuit board after IC program placement, check for code and hardware issues, and equip it with corresponding placement process fixtures and testing racks.

By analyzing the results of PCB manufacturing and assembly samples that have undergone this test, we can understand the functional operation of the PCB assembly board and determine whether there are any faulty areas. For example, if the mouse is clicked up to 100000 times or the LED is turned on and off 10000 times, the possibility of a malfunction is tested. Therefore, the above example can demonstrate that the performance of the PCBA board has been fully demonstrated through this test.

This includes testing circuit cards under extreme conditions such as temperature and humidity, drops, splashes, impacts, etc. Therefore, random samples can be obtained and the standard responsibility of the entire printed circuit component can be inferred.

It mainly observes whether there is a fault intuitively by powering on the assembled circuit board and electronic products for a long time and maintaining their operating state. It is worth noting that only after this step of testing will it be put into the market and sold in factories.

The assembly and testing process of electronic circuit boards is quite complex and plays a crucial role in the entire production process. Without this process, products will experience high failures and rework, which is very detrimental to the development of enterprises. Through the assembly testing and assembly process of printed circuit boards, enterprises can timely understand the quality and effectiveness of their products, make timely improvements based on problems, ensure product reliability, and create a favorable environment for the development of the enterprise and the establishment of its brand.

The principle of the electronic board assembly test bench is very simple, which is to stick the solder pads or components to be tested onto the PCB board through metal probes. When the PCB board is powered on, standard values such as voltage and current of the test circuit will be obtained to observe whether the test circuit is normal.

The production of printed circuit board assembly PCBA test stands is customized according to the size of the test PCB board, the location of the test purpose, the values to be tested, and other requirements. Acrylic, plastic, metal probes, displays, and wires can be used at most, and simple PCB circuit cards can be equipped to complete the entire production.

The PCB printed circuit board assembly test bench is widely used in the entire process of customized circuit board assembly, mainly for testing the assembled circuit board after SMT surface mount and DIP plug-in are completed.

●ICT testing mainly tests the conductivity of the circuit board through testing points to confirm whether the entire PCB board has been successfully soldered.

●The circuit board assembly service testing rack is the main tool to assist in completing this testing.

●The quality of customized PCB assembly test bench is directly related to the effectiveness and pass rate of ICT testing. Due to the frequent long-term operation of PCBA, PCBA foundries have high requirements for its production quality, which must be given sufficient attention.

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.

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)

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 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.

The ICT testing, FCT testing, aging testing, fatigue testing, and harsh environment testing discussed above all belong to reliability testing.

The purpose of the test is to check the compressive strength of the board, and the required equipment is a pressure tester.

The purpose of salt spray testing is to check the corrosion resistance of circuit boards, and the required equipment is a salt spray tester.

The purpose of vibration testing is to check whether the board can pass different levels of random vibration testing, and the required equipment is a vibration meter.

The purpose of high temperature and high humidity testing is to check the adaptability of circuit boards under harsh high temperature and high humidity conditions, and the required equipment is a constant temperature and humidity test chamber.

The purpose of solder strength thrust test is to test whether the solder strength of components meets the requirements, and the required equipment is a thrust meter.

If pursuing cost-effective FPC manufacturing services, choosing a Chinese manufacturer is the best choice. As a manufacturing powerhouse, China has abundant resources, cheap labor, and a large number of technical personnel. We recommend Haibo, a Chinese FPC assembly service provider with over 10 years of experience, who has performed outstandingly in various aspects

Efficient and reasonable quotation:There is an efficient quotation process to assist you in making decisions, providing reasonable prices and highly competitive quotes in China.
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Quick and on-time delivery:The assembly equipment is in good condition, with high productivity, minimal downtime, short delivery time, and also provides urgent services.
Timely and effective response:Always respond to customer needs, provide accurate information, answer questions through multiple channels, and offer one-stop services.
Strong technical strength:China's FPC manufacturing technology is leading, and Haibo has a complete SMT solution that covers assembly, inspection, and other capabilities. It also provides prototype production and customization services.