Skip to content

What is AOI test and why is it important in PCB manufacturing?

What is AOI test and why is it important in PCB manufacturing

What is AOI test in PCB production?

AOI is an abbreviation for Automatic Optical Inspection. In other words, it is a kind of visual inspection method. For example, in the PCB production line, the use of the AOI test is to detect the quality problem on the optical fibre cable and then fix it automatically.

It is a process that’s used to check the boards for defects. The process involves placing electrical components on the board and then checking to see if they are connected correctly.

AOI is also called a non-destructive testing method used for PCBA testing because we cannot destroy any component during the process of inspecting it by using this method; otherwise, there will be no way to fix defects after removing them from their original place with great care so as not to damage them further or even cause small cracks on some materials such as printed circuits boards (PCBs).

The advantages of AOI test

Some listed advantages of the AOI test are given below:

  ★ Flexibility
AOI testing is a flexible approach to measuring optical quality. It can be used to test the performance of any type of optical cable or device, from network cables to fibre-optic cable connectors. It’s also ideal for testing LED lighting and other products that need precise positioning to ensure proper functionality.

  ★ Positional accuracy
Unlike other methods for testing optical quality, AOI does not rely on a fixed measuring point. Instead, it uses a system of software algorithms that are programmed to recognize the unique characteristics of each cable or device being tested. This allows for high positional accuracy without sacrificing flexibility—you can always change the test parameters if need be!

  ★ Cost-effective
AOI testing is a cost-effective method for measuring optical quality. The equipment used is very easy to use and requires little training—all you have to do is plug in your cables or devices and run through some simple tests! That means less time spent on setup and more time spent on testing itself!

  ★ Programmable lighting
Programmable lighting isn’t just a technology—it’s also an important part of AOI measurement.

  ★ Network cable software
AOI tests come with a free network cable software package that allows you to see what kind of data is being collected during each test. Also, it allows you to adjust settings if necessary.

The advantages of AOI test

Why AOI test is necessary in PCB production?

AOI test is necessary for PCB production because it can detect a lot of defects that are difficult to find by manual inspection, and it can save a lot of time. It is more efficient than manual inspection because it can detect defects at the same time.

It is an important inspection system to test and check the quality of your PCB fabrication. It is also used to detect and correct any fabrication defects or manufacturing defects. Therefore, it is useful for checking the following:

● Standards used in PCB board printing
● Proper placement of components
● PCB board dimensions
● Location of solder joints on PCB boards
● The quality of the solder joints on PCB boards
● The quality of the silkscreen printing

How does AOI test work?

AOI test is a fully automatic process that can detect all kinds of defects, including small and hidden defects. It also detects defects on the surface and in the depth of the PCB. This means that you don’t need to repeat testing after adding new layers or modifying your design, which makes this type of testing very cost-effective for production companies who have to make several copies per day.

The efficiency of the AOI test is higher than that of manual inspection because it doesn’t require human intervention during its execution; however, it does require some sort of device (such as an optical reader) that will read out data from your board’s components and display them on a computer screen so it can be seen what went wrong with the product before sending it off for further repairs or replacement parts , which saves a great expense!

Technology used in AOI test

AOI test is a process that uses computer-aided engineering (CAE) technology to analyze the safety and reliability of products. This can be done either manually or automatically, depending on the type of product being tested. The difference between these two methods is that in manual inspection, humans do all the work—they take apart a product and look at it closely so they know exactly what needs fixing before moving on to another one or even moving another step in their workflow.

Instead, the use of automated inspections where computers perform all these tasks – from taking apart pieces until they come back together again (without breaking anything along the way) and measuring stressors against each other at different angles throughout each step which allows us better understand how much force could cause damage should something go wrong during normal operation conditions such as shipping containers being opened incorrectly.

What kinds of defects can be tested in AOI test?

The defects that can be tested in the AOI test are:

◆  Short circuit. If a wire has been shorted, it will cause an open circuit and break the connection between two points. This is usually caused by improper workmanship or handling of the material during assembly or manufacturing processes (e.g., solder joints).

◆  Open circuit. An open connection means there’s no flow of current through the device; this happens when there are any breaks in wires between components or connections within the PCB itself—for example if you confused your solder paste with an entirely different type of paste instead of just making sure it was right before adding some into your board!

◆   The most common way to test for buried via/buried copper vias/buried solder mask vias is by using an optical microscope. The process works by shining a light through the PCB and checking for any breaks in the exposed copper between two sections of metal that are supposed to be connected by a via. If you’ve got a break in your board that isn’t visible with the naked eye, this will show up as well—so make sure you’re checking before sending it out!

Why AOI test is better than manual inspection?

The AOI test is a better option than manual inspection because it provides relevant empirical data that is important from the point of view of documentation, and process control, and avoids the same errors in the future. It deploys various strategies to test a PCB including all its components, soldered joints and traces. It uses a pattern of matching algorithms (PCB and component) to identify and record functional as well as flawed PCBs.

Also, it provides an automated measurement system for proper calibration of all measuring equipment involved during the testing process. The test also offers a unique approach that eliminates any possibility of human error when conducting this type of testing on PCBs.

●  It is more accurate than manual inspection.
●  Much faster than manual inspection.
●  More efficient than manual inspection.
●  Also, it can detect many kinds of defects in PCB assembly lines and improve the quality of PCBs, which will save costs for customers.


AOI test is a very important part of the PCB production process. The test can help to improve the quality of PCB. It will save time and money in the PCB production process. It is a very important part of the PCB production process. It can help to improve the quality of PCB and save time and money in the PCB production process.

Moreover, it is a good solution for PCB manufacturers to check the quality of their boards. It is not only able to detect defects, but also allows you to evaluate the overall quality of your products. The test results help you find and fix problems before they cause problems with production.



Product Categories

Most Popular

Contact Us

IBE News

Related Posts


INDUSTRIES WE SERVE Click on each industry to learn more about how we make custom printed circuit board solutions for each market.Our industries served include

Read More »