EMC refers to the ability of equipment or system to operate in accordance with the requirements in its electromagnetic environment without causing unbearable electromagnetic interference to any equipment in its environment. Therefore, EMC includes two requirements: on the one hand, the electromagnetic disturbance generated by the equipment to the environment during normal operation cannot exceed a certain limit; On the other hand, it means that the equipment has a certain degree of immunity to electromagnetic disturbance in the environment, that is, electromagnetic susceptibility (EMS).Get more news about Anti-surge Flood Light,you can vist our website!
Electromagnetic compatibility includes two aspects: EMI (electromagnetic interference) and EMS (electromagnetic sensitivity):
EMI classification： Ce (conducted interference), re (radiated interference), Pt (interference power test), etc.
EMS classification： ESD (electrostatic discharge), RS (radiation resistance), EFT / b (fast pulse resistance), surge (lightning strike), CS (conduction resistance), etWhat is surge immunity test?
Surge refers to the current, voltage or power transmitted along the line. Its characteristic is that it rises rapidly first and then drops slowly. Surge immunity test is to simulate the serious interference caused by lightning. The surge current immunity test of measuring and control devices in industrial process is to simulate the surge voltage and current generated during lightning stroke or switch switching that may be suffered by the equipment under different environment and installation conditions. The surge immunity test provides a basis for evaluating the anti-interference ability of the power line, I / O line and communication line of the equipment.The surge immunity test mainly includes: surge voltage immunity test and surge current immunity test, mainly studying switching transient, lightning transient and transient simulation.
1. The contents of system switching transient include: switching disturbance of main power system, slight switching action or load change near the instrument in the distribution system, resonance circuit related to the switching device, and various system faults.2. Lightning transient mainly includes: lightning strikes on external circuits, and large current flows through grounding resistance or external circuit impedance to generate voltage; Under construction; The lightning grounding current directly discharged to the ground near the indirect lightning strike 5 generating induced voltage and current on the outer conductor is coupled to the common grounding path of the grounding system of the equipment group. When the protection device acts, the voltage and current may change rapidly and may be combined into the internal circuit.3. Transient simulation includes: the characteristics of the signal generator simulate the above phenomena as much as possible; If the interference source and the port of the equipment under test are in the same line, such as in the power network (direct coupling), the generator can simulate a low impedance source at the port of the equipment under test; If the interference source and the front port of the test equipment are not in the same line (indirectly coupled), the generator can simulate a high impedance source.Therefore, the surge immunity testing is critical for led flood lights, LISUN lauched the SG61000-5 fully automatic surge generator (also called lightning surge immunity test, combination wave generator, surge current generator/surge voltage generator, combined surge voltage and current generator) .