The ICT test fixture is mainly used for the test of the assembled circuit board (PCBA), and the online mainly refers to the electronic components on the line (or on the circuit). Online testing is a testing technology that does not disconnect the circuit and does not remove the component pins. "Online" reflects that ICT focuses on detecting circuit board assembly problems by testing the components on the circuit or the open and short circuit status. Mainly test the open and short circuit, resistance, capacitance, inductance, diode, transistor, transistor, IC and other components of the circuit board. ICT testers are widely used in electronics factories, so what are the advantages of the test fixture, what functions does the test fixture have, and what are the principles for achieving these functions? Please see the specific analysis below.
Advantages of test fixture
The test fixture can accurately locate the quality of the product. For crafts, it can find faults such as solder short circuit, wrong component insertion, reverse insertion, missing installation, pin uplift, virtual solder, pcb short circuit, disconnection, etc. The tested faults are directly located on specific components, device pins, and network points, and the fault location is accurate. The maintenance of the fault does not require much professional knowledge, and the automatic test controlled by the program is adopted, the operation is simple, the test is fast and fast, the test time of the single board is generally from a few seconds to tens of seconds, and it can directly process the gerber file to generate the drilling file, which guarantees Drilling accuracy. The test program is automatically generated to avoid the possibility of manual input errors.
ICT test fixture general function
All parts on the assembled circuit board are detected: resistors, capacitors, inductors, transistors, FETLEDs.
ICT can operate ordinary diodes, stabilized diodes, optical couplings, ICs and other parts in just a few seconds, whether they operate within the designed specifications. Feedback to the improvement of the process.
ICT can find out the defects of the manufacturing process in advance, such as short circuit, open circuit, missing parts, reverse, wrong parts, empty welding and other defects. Including fault location, part specification value, test value.
ICT can print the above-mentioned fault or bad information to the printer to print the test results. For reference by maintenance personnel. It can effectively reduce the personnel's dependence on product technology, without the need to understand the product line, and still have the ability to maintain.
Analysis by production managers
Ability to count bad test information. It is possible to find out the causes of various defects, including human factors, so that they can be resolved, improved, and corrected, so as to improve the circuit board manufacturing and quality capabilities.
Principle of ICT test fixture
The production principle of the ict test fixture: According to the mechanical size drawing of the circuit board, punch the DIP pin on the circuit board and the position of the test point, and then insert the pins. The network (NET) in the circuit board is the PCB wiring, all Lead it out and reach the outside to test the internal circuit structure with an instrument.
The working principle of the ict test fixture: mainly depends on the test probe contacting the test point of the PCB to detect the circuit of the PCB. The ict test fixture is usually the first test process in production, which can reflect the production status in a timely manner, which is conducive to process improvement and promotion. Because of its specific test items, it is one of the important test methods for modern mass production quality assurance.
The above is an introduction to the principles and functions of ICT test fixtures summarized by the editor. I hope I can help you.