3m 5m 10m Anechoic Chamber Radio Darkroom EMC Chamber Semi-anechoic Darkroom

Standards & Clauses:

IEC 61000-4-3 / GB T17626.3 “Electromagnetic compatibility (EMC)–Part 4: Testing and measurement techniques Section3– Radiated, radio-frequency, electromagnetic field immunity test”
EN 55022 “Information technology equipment - Radio disturbance characteristics - Limits and methods of measurement”
CISPR 22 B (30MHz-1GHz) “Information technology equipment - Radio disturbance characteristics - Limits and methods of measurement”
CISPR 16-2-3 (1GHz-18GHz) “Specification for radio disturbance and immunity measuring apparatus and methods- Part 2-3 “Method of measurement of disturbances and immunity- Radiated disturbance measurements”

Application:

Simulating open field test conditions, primarily for radiated interference (EMI) and radiation sensitivity (EMS) measurements.

Test Principle:

Also named EMC darkroom, belonging to the semi-anechoic darkroom (Semi-Anechoic chamber, referred to as SAC), an simulation open field mainly in the static zone, shielding effectiveness, normalized site attenuation, field uniformity, site voltage standing wave ratio and other parameters performance.

Structure:

The EMC darkroom generally consists of the main steel structure, shielding body, wave filter, air conditioning ventilated waveguides (divided into the wind inlet and outlet waveguides), shielding door, absorbing materials, lightings, interface boards, elevated floor, turntable, antenna tower, controller, monitoring systems, smoke alarm systems, and power distribution systems.

Different Anechoic Chambers:

1m Auto Parts Anechoic Chamber
Overview	Automotive darkrooms are specifically designed for radiation emission and radiated immunity tests of automotive components and meet the requirements of DIN / ISO 11452-2 and EN 55025 (CISPR 25). Inside the darkroom, a ferrite absorbing material is installed, and a composite absorbing material is installed at a height of approximately the center of the darkroom. The standard test frequency range is at least between 30MHz and 18GHz. To ensure electrical connection between the ground plane of the test table and the shield, some conductive tape with beryllium copper spring was installed between the absorbing materials.
Dimensions (length*width * height)	6.4m x 5.5m x 3.6m
Frequency Range	30MHz ~ 18GHz (optional to 40GHz)
Test Distance	1m
Radiation Emission Test	Complies with EN 55025 / CISPR 25 requirements
Radiated Immunity Test	In accordance with DIN / ISO 11452
Schematic Diagram
3M Compact Anechoic Chamber
Overview	3m compact anechoic chamber to ensure that the test under the premise of 3m, reducing the darkroom appearance size, compact dimensions, powerful test capabilities, making it more suitable for general office and research facilities. Mainly used for RF immunity, emission estimation and free-space launch test, the test frequency range can cover 30MHz ~ 18GHz. In the frequency range of 30 MHz to 18 GHz, a vertical plane of 1.5 m × 1.5 m is defined in the EUT region, and the center height is 1.55 m, and the uniformity of field strength on the plane is required to reach that the maximum field strength deviation of at least 12 points among 16 points is within 0-6.0 dB.
Dimensions	7.0m × 4.0m × 3.6m (length × width × height)
Frequency Range	30MHz ~ 18GHz
Measuring Distance	3 m
Radiation Emission Test	Pre-test
Radiated Immunity Test	3 meter radiation immunity test according to IEC / EN 61000-4-3
Even Field Size	1.5m × 1.5m, the center height of 1.55m
Max. Deviation	75% of the 16 measurement points comply with -0dB / + 6dB
Schematic Diagram
Standard 3m Anechoic Chamber
Overview	3m anechoic chamber Semi-anechoic chamber designed to exactly 3m test distance, anechoic chambers for EN 55022 / CISPR 22 Class B radiated emissions and IEC / EN61000-4-3 radiated immunity Frequency range from 26MHz to 18GHz So that the darkroom to minimize the reflection. Can be widely used in IT products, household appliances, medical equipment, auto parts, small military electronics, industrial electronics, communications and other electromagnetic compatibility testing, is widely used in the international community instead of the experimental site of the open field.
Dimensions	9.2m x 6.2m x 6.2m (length X width X height)
Frequency Range	26MHz ~ 18GHz (optional to 40GHz)
Test Distance	3 m
Radiation Emission Test	Full compliance with EN 55022 and CISPR 22 Class B requirements (30MHz-1GHz) Full compliance with CISPR 16-2-3 requirements (1GHz-18GHz)
Radiated Immunity Test	Full compliance with IEC / EN 61000-4-3 standard
NSA Maximum Deviation in Accordance with CISPR 16-1-4	6dB, optional 5.5dB
Complies with the Requirements of CISPR 16-1-4 Maximum VSWR	6dB, optional 5.5dB
Test Static Zone	Straight 2.0m / height 2.0m
Even Field Size	1.5m x 1.5m
Max. Deviation	75% of the 16 measurement points satisfy 0dB / + 6dB
Schematic Diagram
Standard 5m Anechoic Chamber
Overview	In the 5-meter method, the distance between the antenna and the walls of the darkroom is larger than the 3-meter method, making it easier to normalize the attenuation of the site. All of the above 60 MHz tests in the 5 meter anechoic chamber are far field tests. In open field tests, there are many signals propagating in the electromagnetic environment in the range of 60MHz to 100MHz, which make the 5-meter anechoic chamber have more prominent advantages than the 3-meter method open field and compared with the 10m method 3-meter law on the 10-meter conversion of the correction is more superior. You can test a larger volume of EUT.
Dimensions (length * width * height)	12.0m x 8.0m x 7.0m
Frequency Range	26MHz ~ 18GHz (optional to 40GHz)
Test Distance	3 m
Radiation Emission Test	Full compliance with EN 55022 and CISPR 22 Class B requirements (30MHz-1GHz) Full compliance with CISPR 16-2-3 requirements (1GHz-18GHz)
Radiated Immunity Test	Full compliance with IEC / EN 61000-4-3 standard
accordance with CISPR 16-1-4	3.5dB
Complies with the requirements of CISPR 16-1-4 maximum VSWR	5.5dB
Test Static Zone	Straight 3.0m / height 2.0m
Even Field Size	1.5m x 1.5m
Max. Deviation	75% of the 16 measurement points satisfy 0dB / + 6dB
Schematic Diagram
Standard 10m Anechoic Chamber
Overview	10m method anechoic chamber simulates the open field environment better and is the best choice for large equipment. In the shielded room ceiling and four wall stickers on the absorbing material, the ground absorbing material using movable laying For RF immunity and emission testing, suitable for larger products. 10m test distance with 3m or more quiet area, the darkroom to meet the FCC, CE and VCCI on the 10-meter darkroom certification and testing requirements..
Dimensions (length * width * height)	24.0m x 17.0m x 9.0m
Frequency Range	26MHz ~ 18GHz (optional to 40GHz)
Test Distance	10 m
Radiation Emission Test	Full compliance with EN 55022 and CISPR 22 Class B requirements (30MHz-1GHz) Full compliance with CISPR 16-2-3 requirements (1GHz-18GHz) Radiated immunity test
Radiated Immunity Test	Full compliance with IEC / EN 61000-4-3 standard
NSA maximum deviation in accordance with CISPR 16-1-4	3.5dB
Complies with the requirements of CISPR 16-1-4 maximum VSWR	5.5dB
Test Static Zone	Straight 5.0m / height 2.0m
Even Field Size	1.5m x 1.5m
Max. Deviation	75% of the 16 measurement points satisfy 0dB / + 6dB
Schematic Diagram