Huaweida Testing & Certification (Shanghai) Co., Ltd.

EMC Testing

EMC Testing (Electromagnetic Compatibility Testing) is a comprehensive test to verify that electrical and electronic equipment can operate normally within its electromagnetic environment and will not generate unacceptable electromagnetic interference to other devices in such environment. Its core is to evaluate two major indicators of equipment: Electromagnetic Interference (EMI) and Electromagnetic Susceptibility (EMS). It is one of the mandatory Test Items for electrical and electronic products to enter the market.

Core Concepts

Electromagnetic Interference (EMI) refers to electromagnetic energy emitted outward during equipment operation, which shall be controlled within standard limits to avoid interfering with surrounding devices.

Conducted Emission (CE): Interference propagated through conductors such as power lines and signal wires.
Radiated Emission (RE): Interference propagated in the form of spatial electromagnetic waves.

Electromagnetic Susceptibility (EMS) refers to the ability of equipment to resist external electromagnetic interference and maintain normal functions under specified interference environments.

Conducted Susceptibility (CS): Resistance to electromagnetic interference transmitted through conductors.
Radiated Susceptibility (RS): Resistance to interference from spatial electromagnetic waves.
Other special susceptibility tests: Electrostatic Discharge (ESD), Electrical Fast Transient Burst (EFT), Surge, etc.

Main Test Items

Test Category	Core Items	Application Scenarios
Electromagnetic Interference (EMI)	Conducted Emission, Radiated Emission, Harmonic Current Emission, Voltage Fluctuation and Flicker	Verification of interference limits for all electrical and electronic equipment
Electromagnetic Susceptibility (EMS)	Electrostatic Discharge Susceptibility	Scenarios where equipment contacts or approaches static electricity sources (e.g. consumer electronics)
	Electrical Fast Transient Burst Susceptibility	Scenarios where equipment power or signal ports suffer interference from switching operations
	Surge Susceptibility	Scenarios where equipment is impacted by lightning strikes and power grid switching surges
	Radiated Susceptibility	Scenarios where equipment is placed in strong electromagnetic radiation environments
	Conducted Susceptibility	Scenarios where equipment receives interference via power / signal wires

Relevant Standards

EMC testing shall comply with international, national or industry-specific exclusive standards. Common standards are listed as follows:

General International Standards: IEC 61000 series (basic electromagnetic compatibility standards).
Chinese National Standards: GB/T 17626 series (corresponding to IEC 61000, electromagnetic susceptibility tests), GB 17625 series (electromagnetic emission limits).
Industry-Specific Standards

Automotive Electronics: ISO 11452 (Radiated Susceptibility), ISO 7637 (Conducted Interference and Susceptibility).
Medical Devices: IEC 60601-1-2 (special EMC standard for medical electrical equipment).
Military Products: GJB 151B (Requirements for Electromagnetic Emission and Susceptibility of Military Equipment and Subsystems).

Value & Benefits

Market Access: Most countries across the globe mandate EMC testing. Products without qualified test reports are prohibited from being launched and sold on the market.

Product Reliability: Equipment that has passed EMC testing operates more stably in complex electromagnetic environments, preventing crashes, performance degradation and other faults caused by interference.

Corporate Compliance: It serves as a vital component of enterprises' quality management system and product compliance control, mitigating risks arising from market supervision.

Service Process

Preliminary Preparation: Confirm product category, applicable standards and Test Items, and prepare samples and technical documents (such as circuit diagrams and product specifications).

Laboratory Testing: Complete all indicator tests with special equipment (such as spectrum analyzers, signal generators, power amplifiers) in professional sites including anechoic chambers (for radiated tests) and shielded rooms (for conducted tests).

Data Evaluation: Compare test results with standard limits to judge pass or failure. If the product fails the test, analyze interference sources and implement EMC rectification.

Report Issuance: Qualified products will be issued an EMC test report, which serves as core evidence for product certifications such as CE and CCC.

FAQ

Our Advantages

Authoritative Qualifications

HWD | HuaWayDa is a comprehensive third-party service institution integrating inspection, testing, metrology, certification, training and enterprise technical services. It consists of Management Center, Marketing & Customer Service Center, Laboratory, Certification Center, Management Institute, Sustainable Development Center and Enterprise Service Center, and is committed to providing customers with professional, efficient and authoritative one-stop enterprise solutions.

HWD | HuaWayDa holds CNCA approval certificate, CMA qualification, measurement standard assessment certificate, CNAS accreditation and other relevant qualifications.

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Choosing us means you are not only selecting a service, but also a long-term partner rooted in professionalism with your success as our mission. We promise to help you build a solid management foundation and sustainable competitive advantages with our professional capabilities.

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