ESD immunity testing: Protecting Products and Enhancing Reliability for ESD test

Electrostatic discharge (ESD) is a quick (nanosecond) physical discharge of static electricity to electronic components and parts. This discharge should be considered as a type of electromagnetic interference. Once an ESD occurs, electronic components lose balance and generate a shock within the circuit. The voltage storms inside the circuit drastically affect the stability of the telecommunication signals, resulting in the system either losing its function or being completely damaged, which in turn seriously affects the reliability and quality of the product.

Because ESD may produce instantaneous large currents, which lead to instantaneous heating or even melting of transistors and chip parts in electronic equipment, ESD immunity is of utmost importance. Therefore, with the advancement of electronic circuit technology, the application of ESD immunity testing in production and design has become widely popular and the implementation of ESD immunity test has become an important part of the basic infrastructure of modern electronic products.

LISUN ESD simulator guns (Electrostatic Discharge Generator/Electrostatic Gun/ESD Guns) is in full compliance with IEC 61000-4-2, EN61000-4-2, ISO10605, GB/T17626.2, GB/T17215.301 and GB/T17215.322.

ESD simulator guns

ESD test is an important part of the anti-static discharge performance of electronic components, which directly reflects the reliability and quality of the system. Therefore, understanding the configuration, principles, and protection recommendations of ESD test is very important. When conducting ESD tests, the ground wire of the electrostatic gun should be connected to the reference ground board (the reference ground board is connected to a safety ground), and the EUT should be placed on the reference ground board (using a desktop or 0.1m high stand), and the head of the electrostatic gun should be directed at parts of the EUT that can be touched by the hands or horizontal coupling board and vertical coupling board, which determines the ESD test which is mainly based on common mode immunity. Because ESD will ultimately flow to the reference ground board.

ESD immunity testing ground board

The principle of ESD interference can also be explained from two aspects: when the electrostatic discharge phenomenon occurs in the part of the EUT being tested, the ESD discharge current will also be generated, and the rise time of the analysis of these ESD discharge current waveforms will be less than 1 ns, which means that ESD is a high-frequency phenomenon; secondly, the ESD current path is not only determined by the actual connection relationship inside the EUT, but also affected by distributed parameters.

For ESD immunity testing, there are some special technical requirements, such as: the spacing between the test probes should be 0.3mm-8mm, the measured ground resistance value should be between 2Ω-8Ω, the voltage amplitude. The angle and number of transmissions should meet the standards of CAN / ISO / TS / IEC-61000-4-2: 2012, frequency of 1.5 KHz, the maximum measured RF current within 100A, the maximum set lightning voltage of 2.5 kV; the set operating voltage value cannot exceed 50V, and the built-in capacitor of the device must have a voltage decoupling value of no less than 2.5V. In addition, when the bond-type test is performed, the distance between the electrostatic tester head and the product surface should be 0.3mm; when the coupling-type test is performed, the distance between the product surface and the head of the electrostatic discharge gun should be greater than 0.3mm, but less than or equal to 8mm.

The aforementioned are technical requirements related to ESD protection. Applying the aforementioned design-level protective measures is highly important in improving the ESD-resistance of devices. However, a considerable amount of experience and technical know-how is still required to further optimize ESD protection design and testing methods, which is one of the main reasons why ESD immunity testing is a technically-challenging task.

In sum, ESD immunity testing is simply a residual strategy following ESD protection design, and implementing the aforementioned techniques in actual designs can greatly improve the ESD resistance of the equipment.

ESD immunity testing is a crucial assurance system for electronic components and products. In practical test scenarios, in addition to following relevant technical standards, device designers must continuously propose improved implementation strategies in order to achieve better ESD resistance, with the goal of providing safety, reliability, and low cost ESD protection for the product. ESD immunity testing is a necessary test to evaluate the ESD performance of the product, and its design objective should be to provide the product with the highest level of safety, reliability and low cost ESD protection and immunity.

ESD immunity testing is an important method for testing the ESD immunity of products. By using proper contact methods, strict testing standards and testing methods, it can effectively reflect the ESD immunity of products and guarantee the quality of products. Professional ESD test manufacturers can help customers solve many ESD testing related problems and comprehensively improve the anti-interference performance and reliability of products.

ESD immunity testing is a necessity test for product immunity to ESD, which is an important guarantee for the overall quality assurance of products. When implementing ESD immunity testing, even if the product can work normally in a powerful electromagnetic environment, it is necessary to continuously improve the test scheme, establish assessment standards, provide more professional services to customers, and ensure higher requirements for product anti-interference performance. In addition, in the era of encryption, the intensive use of personal information and digital engineering requires ESD testing for products to improve the accuracy of ESD resistance and prevent potential security risks caused by ESD.

In order to effectively prevent ESD immunity, it is necessary to take some professional and important measures, such as planting a circle of ground around the PCB as a power ground, isolating the digital ground and power ground, making the ground as complete as possible, laying out away from ESD discharge points, adding transient suppressor protection devices on the signal lines to protect sensitive circuits or chips, etc. These measures can effectively protect products and reduce the impact of ESD. In short, ESD immunity testing is very important, which can protect products from ESD to the maximum extent, improve the EUT’s ESD resistance, ensure product reliability and good quality, avoid the occurrence of safety hazard, and is the key link to improve the stability of electronic products.

In summary, ESD immunity testing not only can effectively protect products from electrostatic interference, but also can effectively improve the anti-ESD ability, ensure the reliability of electronic components, and at the same time avoid security risks caused by ESD. In addition, when implementing ESD immunity testing, mastering some related details to protect the products with the lowest cost is also an important part of improving product quality.

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

Our main products are Goniophotometer, Integrating Sphere, Spectroradiometer, Surge Generator, ESD Simulator Guns, EMI Receiver, EMC Test Equipment, Electrical Safety Tester, Environmental Chamber, Temperature Chamber, Climate Chamber, Thermal Chamber, Salt Spray Test, Dust Test Chamber, Waterproof Test, RoHS Test (EDXRF), Glow Wire Test and Needle Flame Test.

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