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electromagnetic compatibility testing(emc)

electromagnetic compatibility is the ability of equipment or a system to function satisfactorily in its electromagnetic environment without introducing intolerable electromagnetic disturbances to anything in that environment. electromagnetic compatibility tests are performed in laboratory or open area test site. using electromagnetic disturbance test equipment and generation equipment, to evaluate the system or equipment.

electromagnetic compatibility requirements are to ensure that electronic products can work reliably in electromagnetic environment. with the rapid development of wireless communication technology, integrated circuit and new energy and other fields, the electromagnetic compatibility of products has become increasingly important.some of its electromagnetic compatibility testing projects are also included in the projects of china compulsory certification.

service content

noa focus on the compliance and quality of electrical and electronic products, and establish a one-stop service platform for consulting, testing and certification. we provide professional electromagnetic compatibility testing and certification services for electrical and electronic products.

product category: audio/video, information and communication technology equipment, household and similar electrical appliances, vehicle electronic equipment, industrial, scientific and medical equipment, lighting equipment and controlgear.

radiated continuous emission, radiated spurious emission, disturbance power, discontinuous disturbance, conduction continuous emission, conduction spurious emission, harmonic current emission, voltage changes, voltage fluctuations and flicker, electrostatic discharge immunity, radiated immunity, conducted immunity, voltage dips, short interruptions and voltage variations immunity, surge immunity, electrical fast transient/burst immunity, power frequency magnetic field immunity, pulse magnetic field immunity, harmonics and interharmonics immunity.

relevant standards

○ gb 4343.1/cispr14-1《electromagnetic compatibility requirements for household appliances, electric tools and similar apparatus—part 1 :emission》
○ gb/t 4343.2/cispr14-2《electromagnetic compatibility requirements for household appliances, electric tools and similar apparatus—part 2:immunity》
○ gb 17625.1/iec 61000-3-2《electromagnetic compatibility—limits—limits for harmonic current emissions (equipment input current ≤16 a per phase)》
○ gb/t 17625.2/iec 61000-3-3《electromagnetic compatibility (emc) —limits—limitation of voltage changes, voltage fluctuations and flicker in public low-voltage supply systems, for equipment with rated current ≤16 a per phase and not subject to conditional connection》
○ gb/t 17743/cispr15《limits and methods of measurement of radio disturbance characteristics of electrical lighting and similar equipment》
○ gb/t 18595/iec 61547《equipment for general lighting purposes—emc immunity requirements》
○ gb/t 9254.1/cispr32《information technology equipment, multimedia equipment and receivers—electromagnetic compatibility—part 1 :emission requirements》
○ gb/t 9254.2/cispr35《information technology equipment, multimedia equipment and receivers—electromagnetic compatibility—part 2 : immunity requirements》
○ gb/t 17626.1/iec 61000-4-1《electromagnetic compatibility—testing and measurement techniques—overview of immunity tests》
○ gb/t 17626.2/iec 61000-4-2《electromagnetic compatibility—testing and measurement techniques—electrostatic discharge immunity test》
○ gb/t 17626.3/iec 61000-4-3《electromagnetic compatibility—testing and measurement techniques—radiated, radio-frequency, electromagnetic field immunity test》
○ gb/t 17626.4/iec 61000-4-4《electromagnetic compatibility—testing and measurement techniques—electrical fast transient/burst immunity test》
○ gb/t 17626.5/iec 61000-4-5《electromagnetic compatibility—testing and measurement techniques—surge immunity test》
○ gb/t 17626.6/iec 61000-4-6《electromagnetic compatibility—testing and measurement techniques—immunity to conducted disturbances, induced by radio-frequency fields》
○ gb/t 17626.8/iec 61000-4-8《electromagnetic compatibility—testing and measurement techniques—power frequency magnetic field immunity test》
○ gb/t 17626.9/iec 61000-4-9《electromagnetic compatibility—testing and measurement techniques—pulse magnetic field immunity test》
○ gb/t 17626.11/iec 61000-4-11《electromagnetic compatibility—testing and measurement techniques—voltage dips, short interruptions and voltage variations immunity tests》
○ gb/t 17626.13/iec 61000-4-13 《electromagnetic compatibility—testing and measurement techniques—harmonics and interharmonics including mains signalling at a.c. power port, low frequency immunity test》
○ gb/t 17626.29/iec 61000-4-29《electromagnetic compatibility—testing and measurement techniques—voltage dips, short interruptions and voltage variations on d.c. input power port immunity tests》
○ gb/t 22450.1《limits and measurement methods of electromagnetic compatibility for 900/1800mhz tdma digital cellular telecommunications system - part 1: mobile station and ancillary equipment》
○ yd/t 1595.1《requirements and measurement methods of electromagnetic compatibility for 2ghz wcdma digital cellular mobile telecommunications system - part 1: user equipment and ancillary equipment》
○ gb/t 19484.1《requirements and measurement methods of electromagnetic compatibility for 800mhz/2ghz cdma2000 digital cellular mobile telecommunications system - part 1: user equipment and ancillary equipment》
○ yd/t 1592.1《requirements and measurement methods of electromagnetic compatibility for 2ghz td-scdma digital cellular mobile telecommunications system - part 1: user equipment and ancillary equipment》
○ yd/t 2583.14《requirements and measurement methods of electromagnetic compatibility for cellular mobile telecommunications equipment - part 14: user equipment and ancillary equipment for lte》
○ yd/t 2583.18《requirements and measurement methods of electromagnetic compatibility for cellular mobile telecommunications equipment - part 18: user equipment and ancillary equipment for 5g》
○ yd/t 1597.1《requirements and measurement methods of electromagnetic compatibility for 2ghz cdma2000 digital cellular mobile telecommunications system - part 1: user equipment and ancillary equipment》
○ gb/t 19483《requirement and measurement methods of electromagnetic compatibility for cordless telephone》
○ yy 0505/iec 60601-1-2《medical electrical equipment—part 1-2:general requirements for safety—collateral standard: electromagnetic compatibility—requirements and tests》
○ yy 9706.102/iec 60601-1-2《medical electrical equipment—part 1-2:general requirements for basic safety and essential performance—collateral standard: electromagnetic compatibility—requirements and tests》
○ gb 4824/cispr11《industrial, scientific and medical equipment—radio-frequency disturbance characteristics—limits and methods of measurement》
○ gb/t 25119/iec 60571《railway applications—electronic equipment used on rolling stock》
○ gb/t 24338.4/iec 62236-3-2《railway applications—electromagnetic compatibility—part 3-2：rolling stock—apparatus》

service process

q&a

which products are not tested for electromagnetic compatibility in ccc products list of household and similar electrical appliances？

water heater, room heater, induction cooker, electric oven, electric food processor, microwave oven, electric cooking range, oven and similar equipment, range hood, heating liquid, drink machine, electric blanket etc.

what is the reason for the failure of esd test?

the failure phenomena that often occur in esd test include system crash, reset, display panel error and so on. these problems occur because the esd current is coupled to the wires in the circuit board into the cpu. a state that cannot be recovered due to the failure of the cpu to effectively process a signal state change or an interruption caused by interference. esd is also a destructive test item, and the resulting esd current often causes physical damage to the device.

what are the differences between the video signals used in the new standard gb/t 9254.1-2021 and the old standard gb/t 9254-2008 and gb/t 13837-2012?

gb/t 9254-200standard gb/t 9254-2008 and gb/t 13837-2012 respectively use the all h characters and vertical color bar image, the standard video signal used in the new standard gb/t 9254.1-2021 is divided into four levels according to the complexity. digital television set, set-top box, personal computer, dvd equipment, video game console, standalone monitor use the " standard colour bar image with a small moving element " as standard video signals.

for what product there is no applicable limit for harmonic current?

lighting equipment with a rated power less than but not equal to 5 w; equipment with a rated power of 75 w or less, other than lighting equipment；professional equipment with a total rated power greater than 1 kw; with a rated power less than or equal to 1 kw when operating incandescent lamps; with a rated power less than or equal to 200 w for trailing edge dimmers, and universal phase control dimmers with the default mode set to trailing edge, when operating lighting equipment other than incandescent lamps; with a rated power less than or equal to 100 w for leading edge dimmers, and universal phase control dimmers without default mode set to trailing edge, when operating lighting equipment other than incandescent lamps.

our advantage

authoritative qualification

noa has been approved by certification and accreditation administration of the people’s republic of china（cnca）(cnca-r-2002-051), and has obtained qualification of china inspection body and laboratory mandatory approval (cma),and has passed the multiple approvals of china national accreditation service for conformity assessment (cnas), international accreditation service (ias), united kingdom accreditation service (ukas), joint accreditation system of australia and new zealand (jas-anz). noa has been approved by state administration for market regulation of china, and has been recognized as inspection and testing institution of china's special equipment, as well as the qualification of china's national equipment supervision and engineering supervision. noa-dci is the notified body of the ce directive of the european commission. noa has been recognized by the international electrotechnical commission (iecq) by obtaining electronic component quality assessment system. it is also a national inspection and assessment notified body of import and export commodity in china.noa is a high-tech enterprise in shanghai.

improve performance, realize asset value appreciation, and service throughout the entire value chain

from pre-design to post-operation, noa has the ability to guarantee the whole life cycle of the business. noa, as an independent third-party inspection company, has a large number of domestic and international standards and specifications proficient in design, welding, non-destructive testing, painting, packaging and other fields the experienced team of professional engineers and inspection experts, with more than ten years of experience in the domestic market, is familiar with all aspects of the domestic industrial equipment supply chain, and can provide you with technical support services for the full life cycle of technical services in a timely manner, combining various products. inspection, certification, testing, consulting, and auditing services can provide you with one-stop all-round comprehensive services.

quality, efficiency and service

noa has formed a mature and solid operation system in the development of more than 20 years. we let technical experts who are familiar with market regulations and testing standards and have professional industry experience to carry out inspection, evaluation and design review work. while meeting the requirements of domestic and international standards, we ensure that customers can obtain satisfactory service results in the first time with accurate time-sensitive management methods, and ensure that customers can seize the opportunity in the market competition.

service area

noa inspection services currently cover europe, australia, russia, some middle east regions and most regions in china. noa can ensure the consistency and continuity of customer service in different regions, and eliminate the impact of unfamiliar environments on customer quality. the guarantees and the impact of project implementation enable customers to participate in different markets across the country or around the world with flawless quality.

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