Power Supply EMC Compliance Certification

As a core component of electronic devices, the electromagnetic compatibility (EMC) of power supplies directly affects the stability and safety of the entire system. JJR Testing Lab, a CNAS-accredited third-party emc testing institution in China, specializes in providing comprehensive EMC services for power supplies, including pre-compliance testing, on-site rental testing, issue rectification, and certification report issuance.

Equipped with advanced laboratory facilities and a professional technical team, JJR Lab conducts full-suite EMC testing in accordance with domestic and international standards (such as GB, IEC, CISPR, etc.), helping clients rapidly identify and resolve electromagnetic interference (EMI) and electromagnetic susceptibility (EMS) issues to ensure market compliance.

Purpose and Importance of Testing

1.Regulatory Compliance: Global markets (e.g., CE certification for the EU, FCC certification for the US) mandate EMC testing for electronic products. Non-compliant products face the risk of removal from shelves or financial penalties.

2.Performance Assurance: Excessive EMI from power supplies can lead to system crashes, data loss, or interfere with nearby electronics such as Wi-Fi networks or medical equipment.

3.Brand Reputation: Passing EMC tests enhances product reliability and consumer trust, and helps avoid costly after-sales disputes caused by quality issues.

Testing Standards

Domestic Standards (China)

- GB/T 17626 Series: Immunity tests for ESD, EFT, etc.

- GB 4343.1/2: EMC requirements for household appliances.

- GB 9254: Radiated emission limits for IT equipment.

International Standards

- CISPR 22: Limits and methods of measurement of radio disturbance for IT equipment.

- IEC 61000-4 Series: General standards for immunity testing.

Testing Items and Requirements

Electromagnetic Interference (EMI) Testing

- Conducted Emissions: Measures interference from power lines (0.15 MHz – 30 MHz).

- Radiated Emissions: Assesses radiated disturbances from equipment (30 MHz – 1 GHz).

- Harmonic Current: Ensures power supply harmonics meet GB 17625.1 limits.

Electromagnetic Susceptibility (EMS) Testing

- Electrostatic Discharge (ESD): 4kV contact / 8kV air discharge; performance criteria: Class B.

- Electrical Fast Transient (EFT): ±2kV test on power port.

- Surge Test: Simulates lightning-induced surges; 2kV line-to-ground.

Other Specialized Tests

- Power frequency magnetic field

- Voltage dips

- Intermittent interference

Report Issuance Process

1. Needs Assessment: Submit product specifications, schematics, and determine applicable standards and test items.

2. Sample Testing: Lab conducts individual tests, records data, and analyzes failure points.

3. Rectification Support: Offers improvement plans for failed items (e.g., shielding design, filter optimization).

4. Report Delivery: Upon passing, a CNAS-accredited report is issued within 5–7 business days, supporting global market entry.

EMC testing for power supplies is a “must-pass” milestone before market launch. Whether you're a manufacturer, trader, or e-commerce seller, choosing a professional lab significantly reduces compliance risks. With over a decade of industry experience, JJR Testing Lab helps you quickly achieve certification and seize market opportunities.