跳至主要内容

What is EMC?

EMC (Electro Magnetic Compatibility) is ability of an equipment or system to function satisfactorily in its electromagnetic environment without introducing intolerable electromagnetic disturbances to anything in that environment. Thus, EMC includes to two aspects: one is the electromagnetic interference caused by equipment during the normal operation can not exceed a certain limit for that environment; the other side is appliance shall has capacity of resisting disturbance to electromagnetic environment, that is Electromagnetic susceptibility. 

EMC includes EMI (interference) and EMS (susceptibility). EMI (electromagnetic interference) describes the electromagnetic disturbances caused by electric and electronic appliances in normal operation to environment, which includes CE (conduction emission), RE (radiation emission) and harmonic tests. EMS (electromagnetic susceptibility) describes if the electric and electronic equipment will be disturbed by other appliance in same circuit or in surroundings. EMS includes ESD (elestrostatic discharge), CS , RS (Radiation interference), EFT (electrical fast transient), surge (lightning surge), voltage dip and interrupt and etc. 

Like household appliance, the EMC test requires two aspects, EMI and EMS. 

EMI test items includes: 
1) Continuous interference voltage (150KHz~30MHz)
2) Disturbance power: 30MHz~300MHz)
3) Harmonic current (2~40 times harmonic)

EMS test items includes: 
1) Electrostatic discharge immunity measurement 
2) Radiation field (80MHz~1000MHz) immunity measurement
3) Electrical fast transient/burst group immunity measurement
4) Lightning surge immunity measurement
5) Injection current (150KHz~230MHz) immunity measurement
6) Voltage dip and short interruption immunity measurement

In China, the key parts of household appliance request to do EMC testing, the list as below: 
Air conditioner: compressor, PC control board (includes frequency convertor), anion generator, power filter
Refrigerator: compressor, PC control board (includes frequency convertor), power filter, mechanical temperature controller
Washing machine: programming controller (includes timer), computer controller, power filter, motor
Electric cooker: temperature controller, computer controller, electric hot tray
Electric iron: galvanothermy tube, temperature controller
Electric fan: computer controller, motor
Electric hair drier:motor, filter, speed controller

Pego released part of EMS equipment, includes ESD generator, EFT generator, lightning surge generator, voltage dip and short interruption generator and ring wave generator. Those equipment can help the electrical and electronic equipment manufacturers to improve the quality of their products in the loop of design and R&D.

标签：

评论

发表评论

此博客中的热门博文

vertical impact hammers

The vertical impact hammer is designed according to IEC60068-2-75 test Ehc, the hammer consists by a striking element which falls freely from rest through a vertical height on to the specimen surface held in a horizontal plane, and the fall of the striking element shall be along a guideway, the guideway shall not rest on the specimen and the striking element shall be free of the guideway on the striking the specimen , the mass of striking element is equal to equivalent mass . 2J striking element equip with Φ 40 mm*4 71 mm guideway, 5J striking element equip with Φ6 8 mm*3 85 mm guideway, 10J striking element equip with Φ8 9 mm* 337 mm guideway, 20J striking element equip with Φ10 8 mm* 520 mm guideway, 50J striking element equip with  Φ12 9 mm* 650 mm guideway. 
发表评论
阅读全文

JIS D0203 rain nozzle and spray nozzle test chamber

https://www.pegotester.com/JISD0203_rain_and_spray_test_chamber.html The spray nozzle and rain nozzle test chamber is designed to meet the test requirements of JISD0203 R1/R2 rain test and S1/S2 spray test. The rain nozzle has 2 holes and spray nozzle has 40 holes. Type Symbol Test Purpose Test Method Rain Test R1 Auto parts against water direct contact water pressure: 0.01Mpa, water flow: 1.9L/min, water temperature: ordinary temperature, test time: 10min R2 Auto parts against rain or spray water   indirect contact water pressure: 0.03Mpa, water flow: 3.2L/min, water temperature: ordinary temperature, test time: 10min Spray Test S1 Auto parts against rain or jet water direct contact water pressure: 0.10Mpa, water flow: 24.5L/min, water temperature: ordinary temperature, test time: 30min S2 Auto parts against riptide water pressure: 0.30Mpa, water flow: 39.2L/min, water temperature: ordinary temperature, test time: 1h  
发表评论
阅读全文

The relationship between standards IEC62262 and IEC60068-2-75

  The IK code is a coding system to indicate the degree of protection provided by an enclosure against harmful external mechanical impacts. The standard IEC62262 defines the impact energy corresponding to different IK codes. In general, the degree of protection applies to the complete enclosure. If parts of the enclosure have differing degrees of protection, the latter shall be indicated separately. IK00 IK01 IK02 IK03 IK04 IK05 IK06 IK07 IK08 IK09 IK10 IK11 0 0.14J 0.2J 0.35J 0.5J 0.7J 1J 2J 5J 10J 20J 50J IK00 - no protection IK01 - withstands 0.14J impact force (equivalent to the impact of an object weighing 0.25KG falling from a height of 56mm on the surface) IK02 - Withstand 0.2J impact force (equivalent to the impact of an object weighing 0.25KG falling from a height of 80mm on the surface) IK03 - Withstand 0.35J impact force (equivalent to the impact of an object weighing 0.2KG falling from a height of 140mm on the surface) IK04 - Withstand 0.5J impact force (equivalent to t...
发表评论
阅读全文