CISPR 11 / EN 55011 : What is a 'small EUT'?
In the context of CISPR 11 / EN 55011, a “small EUT” (Equipment Under Test) refers to equipment that fits into a cylinder with a diameter of 1.5m and a height of 1.5m (measured from the floor = reference ground plane).
Whether a EUT is small is mainly relevant for determinining the distance it has to be measured at. See CISPR 11 / EN 55011 : What measurement distance for Class A and Class B? for details.
Source: EN IEC 55011:2025, Section 3.1.32
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