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Get to Know About In-Circuit Test Elements

 Jul 29, 2022

In-Circuit Test
In-circuit test (ICT) is a process of testing an electronic device by connecting it to an external power supply and observing its behavior, rather than removing it from its housing and testing it on an examination bench. In other words, ICT is a type of electronic testing in which electrical components are tested while they are still installed on a circuit board. This allows for more accurate detection of defects and identification of intermittent faults. ICT can be used to test a wide range of devices, from microchips to entire printed circuit boards. The testing technique can be used to detect opens, shorts, and impedance. In addition, ICT can also be used to identify bad solder joints and cold solder joints. Several components are used throughout the in-circuit test procedure. Some of the most common testers used include bed-of-nails, tester, fixture and software, which are discussed in brief in this post.

Main Elements of In-Circuit Test Explained

There are different types of hardware that can be used in in-circuit test. Some of the most common pieces of hardware include:
  • Bed-of-Nails- In-circuit testing (ICT) is a process of testing an electronic device by connecting it to a special testing bed called bed-of-nails. The bed-of-nails consists of a number of metal nails that are inserted into the circuit board of the device being tested. The nails are connected to a power supply and a test probe, which is used to apply voltage and current to the nails. This allows the tester to measure the resistance, impedance, and other properties of the circuit board.
  • Tester: Testers are an important part of in-circuit test (ICT) process. The tester is responsible for applying stimulus to the device or circuit under test, and for measuring and recording the resulting response.
  • Fixture: The fixture holds the assembly in place and provides electrical connection between the assembly and the tester. Fixtures are an important part of an in-circuit test system. They provide a stable and repeatable mounting surface for test probes and contact pins. Fixtures also ensure that the test probes make good electrical contact with the circuit board under test.
  • Software: The role of software in in-circuit test systems is to provide the necessary programming to control the testing process and collect data from the test equipment. The software also provides analysis and reporting capabilities to help users troubleshoot problems and improve the efficiency of the testing process. Overall, the role of software in an in-circuit test system is to control the test system, collect data from the probes, and present the data to the user. The software also performs analysis of the data and presents results to the user in a meaningful way.
The failure of any element in an in-circuit pcb test system can have a ripple effect, resulting in an overall failure of the system. This is because each component in the system is interconnected and dependent on the others.

Hence, partnering with a PCB manufacturer who is an expert in all testing and inspection methods is the best way to ensure product quality. By having a partner who understands all the various testing and inspection methods, including visual inspection, AOI (automated optical inspection), X-ray inspection, and functional testing, you can be sure that your products will meet the highest quality standards. Needless to say, by working with an expert PCB assembly service provider like Accelerated Assemblies who understands the importance of quality control, you can avoid unnecessary hassle and additional expenses. In addition, such reliable service provider can help you to identify potential problems with your PCB design early on, before they become costly and time-consuming to fix.