Good News | NTEK 10‑m EMC Semi‑Anechoic Chamber Put into Service
With the advancement of technology, electronic products are deeply integrated into all aspects of our daily life. A wide variety of large‑scale equipment has entered the market, making compliance testing for such products critically important.
NTEK Group’s 10‑meter semi‑anechoic EMC chamber in Shenzhen has been officially put into operation. The laboratory can test industrial and civil products such as large‑scale wireless devices, energy‑storage equipment, EV charging piles, photovoltaic equipment, automotive components and complete vehicles.
Features of 10‑meter Semi‑Anechoic EMC Chamber
The 10‑meter semi‑anechoic EMC chamber is designed to meet the testing requirements for large‑size equipment. Its main features are as follows:
★ Large‑diameter turntable with high load‑bearing capacity, supporting heavy‑weight samples such as industrial power supplies, power conversion systems for energy storage, automobiles and large medical‑care equipment;
★ Extensive quiet zone. Compared with the 3‑meter chamber, its quiet zone can reach 5 meters or even larger;
★ Low site reflection at low frequencies down to 30 MHz.
Necessity of 10‑meter Semi‑Anechoic Chamber
Enterprises select 10‑meter‑chamber measurements mainly for two reasons: 1) physical size of the equipment under test; 2) national certification‑standard requirements for different products. For instance, some regions prefer measurement results obtained in a 10‑meter setup for radiated disturbance tests below 1 GHz.
For disturbance measurements within 30 MHz‑1 GHz, log‑periodic antennas are commonly used, with a typical 3‑dB beamwidth of approximately 60°. At a 3‑meter test distance, the illuminated width is 3.5 m; at a 10‑meter test distance, the illuminated width reaches 11.6 m. Obviously, the 10‑meter test distance can cover much larger samples compared with the 3‑meter setup.
Electromagnetic radiation from equipment propagates in space in the form of electromagnetic fields, which are divided into near‑field and far‑field. For product‑testing purposes, the far‑field condition is preferred. In the far‑field, electric‑field, magnetic‑field and wave propagation directions are mutually perpendicular, and amplitudes vary linearly in inverse proportion to distance. The near‑field shows complex characteristics with non‑linear amplitude‑distance relations. Near‑field measurement results are susceptible to wave‑phase effects.
The boundary between far‑field and near‑field is defined by the formula:
d=λ/2π
Where: d = distance between measuring point and field source; λ = wavelength of electromagnetic wave.
Regions where belong to the near‑field; regions where belong to the far‑field.
Accordingly, for the 3‑meter test setup, measurements below 300 MHz are performed under near‑field conditions, while measurements above 300 MHz are in the far‑field. For the 10‑meter setup, near‑field conditions apply below 100 MHz, and far‑field conditions apply above 100 MHz.
Both 3‑meter and 10‑meter semi‑anechoic chambers are widely‑used EMC test environments. Nevertheless, test standards and regulations vary across countries and regions. Therefore, test‑method selection shall be determined according to the specific product and target market.
NTEK 10‑meter Chamber Technical Specifications
Power Supply Capacity:
‑ DC: 1500 V, 400 A × 3, total power 900 kW
‑ AC: 690 V, 500 A × 3, total power 900 kW
Turntable: 6 m diameter (embedded type), load‑bearing capacity 6000 kg
As a national‑level high‑tech enterprise and a public comprehensive test platform for intelligent connected systems, new‑type materials and electronic products, NTEK provides quality‑oriented technical services including market‑access certification, test & verification, failure analysis and simulation for intelligent communications, new‑energy vehicles, rail transit and aviation components.
NTEK Smart Energy Business Division possesses complete testing capabilities for PV‑charging‑ESS products, committed to delivering one‑stop testing and certification services. The scope covers EMC, electrical safety, electrical performance, environmental & mechanical reliability, communication protocol & interoperability, and grid‑connection performance.
For operators, NTEK provides on‑site testing, assessment and operation‑maintenance services for EV charging stations. For EMC testing, both laboratory‑based testing and on‑site field testing are available. On‑site EMC testing solves challenges for oversized or permanently‑installed samples that cannot be transported into the laboratory and mitigates risks associated with sample transportation.
