The 3m Semi Anechoic Chamber is designed to conduct comprehensive compliance measurements of radiated emissions and immunity at both 3-meter and 1-meter testing distances. The chamber features a robust construction that includes a 2mm galvanized pan-type panel system, parallel-closing RF shielded doors, and polystyrene hybrid absorbers on the walls, floor, and ceiling. These elements collaborate to create a high-performance, controlled electromagnetic environment that adheres to international standards for immunity and emission testing. The 3m Semi Anechoic Chamber is suitable for a wide range of EMC testing for commercial, military, and automotive products.
Product Description
The main purpose of a 3m semi anechoic chamber is to perform full compliance measurements of radiated emission and immunity at 3m or 1m test distance. The combination of the pan-type 2mm galvanized panel system, parallel closing RF shielded doors and polystyrene hybrid absorbers on the walls, floor and ceiling creates a high performance controlled electromagnetic environment that complies with international immunity and emission test standards. The 3m semi anechoic chamber meets most EMC testing of commercial, military and automotive products.
Features of a 3m semi anechoic chamber:
Full compliance emission test site for frequency range of 30MHz to 18GHz as per CISPR 16-1-4 (2010) +annex A1 (2012) (free space testing)
Full compliance immunity test site for frequency range of 80MHz to 6GHz as per IEC/EN 61000-4-3
Shielding effectiveness according to EN 50147-1 (>80dB at 10kHz)
Acceptance standards for a 3m semi anechoic chamber:
CISPR 16-1-4
IEC/EN 61000-4-3
EN 50147-1
ANSI C63.4
FCC part15
CISPR 25(special customization)
MIL-STD-461(special customization)
Product standards for a 3m semi anechoic chamber:
CISPR 32
CISPR 35
CISPR 11
CISPR 14
CISPR 15
Typical performance of a 3m semi anechoic chamber:
NSA: +/-3.5dB at 3m test distance
sVSWR: ≤ 5.5dB at 3m test distance
FU: 75% of 16 points ≤ 6dB at 3m test distance & 1.5*1.5m test window (0.8m above floor level)
Typical specifications for a 3m semi anechoic chamber:
| External dimensions | 9.7m*6.7m*6.3m（L*W*H） |
| Dimensions | 9.1m*6.1m*5.7m（L*W*H） |
| Control room dimensions | 4.0m*4.0m*3.0m（L*W*H） |
| Amplifier room dimensions | 4.0m*2.1m*3.0m（L*W*H） |
| Construction | 2mm galvanized shielding panels with a free standing structural steel support |
| Absorbers | Hybrid solution of ferrite tiles and polystyrene hybrid absorber on walls, floor and ceiling |
| Ventilation | 300mm*300mm/18GHz |
| Shieled door | RF shielded swing door 1.2m*2.1m (W*H) |
| Ground interface board | 400mm*400mm/18GHz, including RF connectors |
| EUT power line | Filtered 220V 32A 50Hz/60Hz; 380V 63A 50Hz/60Hz |
| Lighting | Interference-free LED automatic lifting and lighting system |
| Frequency range | 30MHz to 18GHz for radiated emission and 80MHz to 6GHz for radiated immunity |
| Test distance | 3m between center of antenna and EUT |
| Quiet zone size | Diameter 2m, height 3m |
| Floor | Ferrite tiles and hybrid absorbers incl. a walk way solution. |
In addition to the typical specifications of 3m semi anechoic chamber, RFT can also customize the anechoic chamber configuration for customers according to the size of quiet zone and the type of test standard.
3m semi anechoic chamber option
After special design of anechoic chamber, CISPR25 test table and corresponding grounding system are installed, CISPR25 emission and immunity test are carried out, and the original performance of anechoic chamber would not be affected.