In the military sector, requirements for surge (or impulse) immunity are far more stringent than commercial standards, directly impacting the survival and mission reliability of electronic equipment in complex and harsh electromagnetic environments. Its evaluation is a systems engineering process that spans design, verification, and certification, relying fundamentally on rigorous test standards, comprehensive assessment dimensions, and top-tier laboratory capabilities.
I. Standard Systems: Dual Stringent Assessment per Chinese Military (GJB) and U.S. Military (MIL-STD) Standards
The evaluation of surge immunity for military equipment strictly adheres to two major standard systems: Chinese Military Standards (GJB) and U.S. Military Standards (MIL-STD).
GJB (GuoJunBiao): Centered around GJB 151B-2013 (replacing older versions like GJB 151A-97) and its associated GJB 152A-97. Key CS (Conducted Susceptibility) test items, such as CS105 and CS106, directly simulate transient spikes and surge disturbances from power lines and signal lines, defining the equipment's tolerance threshold under severe electromagnetic stress.
MIL-STD: MIL-STD-461G is the internationally recognized benchmark. Its test items like CS115 (Impulse Excitation Conducted Susceptibility) and CS116 (Damped Sinusoidal Transient Conducted Susceptibility) accurately simulate specific waveform interference caused by lightning, power supply switching, and Nuclear Electromagnetic Pulse (NEMP). Their test levels (involving thousands of volts and hundreds of amperes) directly reflect the extreme nature of the battlefield environment.
II. Core Assessment Dimensions: Reliability Requirements Beyond the Norm
Extremely High Severity Levels: The energy levels of test waveforms (e.g., Combination Wave, Damped Sine Wave) far exceed commercial standards, aimed at verifying the physical integrity and functional maintenance of equipment under direct or indirect electromagnetic attack.
Multi-Path Coupling Mechanisms: Evaluation targets not only the equipment's power ports but also all signal, control, and communication ports potentially connected to the external environment, including cable shields, testing its comprehensive "immune system."
Zero-Tolerance Performance Criteria: Military products are required to withstand surge impulses without any permanent damage, functional interruption, or malfunction during or after the test. Any performance degradation must remain within strictly defined limits, and normal function must resume immediately after the disturbance ceases, ensuring operational continuity and determinism.
III. Product Category Differences and Customized Validation
Different military platforms have distinct emphases:
Aerospace/Aviation Equipment: Highly sensitive to weight and volume, requiring surge protection designs that achieve maximum effectiveness and reliability within extreme space constraints.
Vehicle/Naval Equipment: Feature complex power systems and are susceptible to engine starts, load dump, and direct lightning strikes, requiring protective components with very high energy absorption capacity and fast response characteristics.
Command, Communication, and Information Equipment: Process critical mission data; any data corruption or transient failure due to surges could lead to tactical failure, demanding ultimate signal integrity and system stability.
IV. Top-Tier EMC Laboratory: The Cornerstone for Ensuring Accurate Evaluation
Conducting the aforementioned stringent assessments necessitates reliance on laboratories with cutting-edge hardware and comprehensive qualifications. Our EMC laboratory embodies this required capability:
We are fully equipped with imported, state-of-the-art EMC instruments and test systems from leading international manufacturers such as Rohde & Schwarz (Germany), ETS (Germany), TESEQ (Germany), Schwarzbeck (Germany), Keysight (USA), AR (USA), and EMC PARTNER (Switzerland). This provides unparalleled hardware support for world-class accuracy, comparability, and reliability of test data.
Currently, the laboratory possesses 1 x 3-meter Semi-Anechoic Chamber (SAC), 1 x Military Standard 1-meter SAC, and 6 x Electromagnetic Shielded Enclosures, configured with over 30 complete test systems covering electromagnetic emissions and immunity. The total investment exceeding 15 million RMB in advanced equipment constitutes a technologically leading and fully functional testing platform.
Leveraging this robust capability, we provide one-stop EMC testing services for clients ranging from Navy, Air Force, and Army military equipment to various civilian products:
In the Military Domain, we are proficient and fully equipped to perform testing per the complete suite of military standards including GJB 151-86, GJB 151A-97, GJB 152A-97, GJB 151B-2013, HJB 34A-2007, enabling rigorous validation of your equipment – from surge immunity to full EMC compliance.
In the Civilian Domain, our testing capabilities comprehensively cover major global standards such as Chinese GB, American (FCC/ANSI), European (EN), British (BS), Australian/New Zealand (AS/NZS), Canadian (ICES), and Japanese (VCCI) standards. The service scope includes Information Technology equipment, optoelectronic and communication equipment, marine equipment, rail transportation equipment, power equipment, industrial, scientific, and medical equipment, light and heavy industrial equipment, lighting equipment, and household appliances.
Conclusion:
In the military sector, surge immunity is a critical metric for evaluating equipment's adaptability to the electromagnetic environment. It requires integrating protective considerations from the design source and ultimately validating them through strict standards-based testing in top-tier laboratories. Our EMC laboratory, integrating world-class equipment, comprehensive test facilities, and profound standard expertise, is the most solid foundation for ensuring your products – whether military gear for the battlefield or commercial goods for competitive markets – operate stably and reliably in complex electromagnetic environments.
