Semi-anechoic chambers: five absorbing surfaces and a metal floor.
Most commercial radiated-emission standards describe an open test site with a metal ground plane. A semi-anechoic chamber recreates that site indoors.
Why the floor stays reflective
Walls and ceiling are lined with absorber, but the floor is a metal ground plane, because the emission methods measure the direct and the floor-reflected wave together while the antenna scans in height.
Measurement distances
- 3 m chambers: compact, the most common choice for many commercial products
- 5 m chambers: a middle option where space allows
- 10 m chambers: for methods and products that need the longer distance, and for large equipment
Validation
A SAC used for formal tests is checked against site criteria such as normalized site attenuation (NSA) below 1 GHz and site VSWR above 1 GHz. TESTUPS offers site validation support with partner laboratories, within the scope agreed for each project.
Immunity in a SAC
For radiated-immunity tests the floor between antenna and product is covered with additional absorber, so the same room can serve emission and immunity tests.
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