FACs are defined as test sites without a ground plane in CISPR 16-1-4. Compared to the SAC (semi-anechoic chamber), they are coated with absorbents not only to partitions and ceilings, but also to the floor. The main advantage of the FAC is the fact that no ground-level reflection can occur, so there is no need to have a large antenna sweeping height, which reduces the duration of tests. However, special adjustments are necessary (the floor is also covered with absorbents) for the preparation of the test, especially for large and heavy objects under test. Generally, FACs are larger in size and represent a larger investment compared to SACs. But they have the huge advantage of reducing the duration of testing.

TypeFAC 3FAC 5
External dimensions 10,58 x 6,08 x 7,50 m (l x L x h)12,08 x 8,18 x 7,50 m (l
x L x h)
Frequency range From 26MHz to 18 GHz
Measurements distance3.0 m5.0 m
Absorbents to partitions/ceiling and floor Complete coating with ferrite F006 and partial with hybrid absorbers H600 and H1000
Emission measurements Complies with CISPR 16-2-3
1.5m x 1.5m
5.0 m
Max deviation in NSA according to CISPR 16-1-4+4dB
Max deviation in SVSWR according to CISPR 16-1-4 6dB
Size of the test volume Diameter 1.2mDiameter 2.0m
Hauteur 1.5mHauteur 2.0m
Immunity tests Complies with IEC / EN 61000-4-3
Dimension of uniformity of field 1.5m x 1.5m
Maximum deviation -0dB/+6dB on 75% of the 16 points measured

Standard Equipment

  • 1x Access door, 0.938 x 1.968 m
  • 6 honeycombs for ventilation
  • 1 440VAC power supply filter, 4x32A
  • 2 penetration panels
  • Electrical equipment
  • Lighting
  • Wooden floor
  • Wooden table
  • absorbents
  • Antenna mast
  • Controller for antenna mast and turntable
  • Turning table
  • Raised floor for antenna mast and turntable
  • Cable crossings: 6x N, 4x BNC and 4x for optical fibers


  • Three-phase power filter
  • Signal filter and / or data line Fan
  • Antenna support
  • Video and / or audio system
  • Instrumentation Performance Monitoring
  • Non-combustible hybrid absorbers