An unbiased data sheet
A 3m compliant test chamber has to be compliant for radiated EMC emission and immunity measurements at a 3 metre (3m) measurement distance.
The chamber is shielded from ambient electromagnetic Interference (EMI) with a steel faraday cage outer which has a steel support structure for load bearing.
The shielded chamber would have: Door(s), power/data filters, coaxial ports, ventilation panels and other facilities as specified
The internal aspects require a specifically designed anechoic lining ferrite tile+ pyramidal absorber, normal carbon doped pyramidal absorbers are of no use in this type of chamber.
The chambers are normally lined with ferrite tiles on the walls and ceiling, the performance above 1000MHz (1GHz) is reliant on special hybrid pyramidal absorbers that give a degree of anechoic performance above 1GHz without greatly impairing the ferrite’s performance below 1GHz.
The CISPR16 Site Voltage Standing Wave Ratio (SVSWR) test above 1GHz requires the chamber to act as free space, for this reason there are floor absorbers (usually 200mm deep) on most of chamber floor to prevent floor reflections.
This type of chamber has to comply with the measurement accuracy limits set out in CISPR16-1-4
Compliance to the standard requires an absorber system designed and produced tight tolerances.
It is important for the customer to have credible independent testing carried out by a competent test body otherwise shielding and anechoic capability has no validation.
There are several companies that can manufacture and install this type of product
