详情描述

ICT is widely used, with high measurement accuracy and clear problem indication. It is a standard testing method, even for workers with average electronic skills, it's easy to handle problematic PCBA. Using ICT can improve production efficiency and reduce costs.


ICT Test primarily checks for open circuits, short circuits, and soldering conditions of all components on the PCBA by testing the contact points on the PCB layout with test probes. It can be divided into open circuit testing, short circuit testing, resistance testing, capacitance testing, diode testing, transistor testing, FET testing, and IC pin testing (testjet co).Ensure proper installation of standard and specialized components such as BasicScan Bist, identifying issues like missing or incorrectly installed parts, parameter value discrepancies, solder joint shorts, and PCB open/short circuits. Accurately inform users of the faulty component or the specific point of the open/short circuit through a printer or screen display.

What is ICT?


A: ICT (In-Circuit Test System), commonly referred to as the Online Tester in Chinese, is primarily used for testing assembled circuit boards (PCBA). The term "online" here is a direct translation of "In-Circuit," referring to components on the circuit path. Online testing involves a technique that doesn't disconnect the circuit or remove component pins, focusing on detecting assembly issues of the circuit board through tests of components or short/open circuit states on the circuit path.


Q: What basic functions of ICT can measure those components?


Open circuit, short circuit, resistance, capacitance, inductance, diodes, IC protected diode testing, etc.


Why use ICT?


A: Statistical data from the PCB assembly industry shows that assembly defects are mainly体现在焊接开路、短路、偏移、缺件等方面，accounting for over 90%. Therefore, the principles of online testing technology application are to quickly detect faulty components or assembly defects and accurately locate and classify the defects.


A: Can ICT be considered as a multi-meter?


A: ICT can be regarded as an automated advanced multimeter, and due to its circuit isolation (guarding) feature, it can accurately measure the actual values of each component within the circuit.


Q: What are the differences in functionality between ICT and general electricity meters?


A: The meter is used for measuring individual parts, while the ICT not only measures individual parts but also can measure parts on a PCB through a needle bed. However, there are many circuits on the PCB, which easily cause signal source divergence and voltage distribution, so often "Guarding" functionality is required to ensure accurate measurement.


Q: What is the relationship between ICT and AOI?


A: ICT is primarily conducted through electrical measurement methods, whereas AOI relies on optical image processing technology. Both have their strengths and complement each other. In terms of process scheduling, it's typically AOI first, followed by ICT.

ICT testing is a static test (no power applied), while FCT testing is a dynamic test (power applied). For example, if a test board has a short, the FUNCTION test can easily burn out components, causing unnecessary losses. These defects need to be detected at the ICT station. The ICT station can inspect PCB traces and effectively identify various defects and faults during the PCBA assembly process. However, it cannot evaluate the performance of the entire system composed of the circuit board at clock speeds. Functional testing, on the other hand, can verify if the entire system achieves the design objectives by treating the tested unit on the circuit board as a functional entity, providing input signals, and detecting output signals according to the functional entity's design requirements. This test ensures the circuit board operates as designed. Therefore, a simple method for functional testing is to connect a specialized circuit board from a finished electronic device to the appropriate circuits of the device, apply voltage, and if the device operates normally, it indicates the circuit board is qualified. This method is simple and requires minimal investment. This is why PCBs undergo ICT testing followed by the addition of a FUNCTION testing station. No test model can achieve a 100% complete test; only a combination of ICT and FCT testing stations can effectively detect defects.