10 metres is the separation between the Equipment under test (EUT) and the receive antenna, sometimes the ‘equipment’ can be called ‘device’, thus, DUT is then used as an abbreviate
The chambers can vary in size but 18m x 13m x 8.5m high is common for a ‘ferrite tile + pyramidal hybrid’ absorber lining.
For a 10m chamber with 2m long hollow pyramidal absorbers the chamber has to be a little bit larger at around 20m x 15m x 9m high.
The chamber can be used for 10m and 3m separation EMC compliant emission testing and also the chamber will comply to EN/IEC61000.4.3 radiated immunity testing (with some absorber on the floor)
Often these test chambers have integral false floor to house cables and flush fitting turntables.
