Test Requirements


Test limits

The Federal Communication Commission (FCC) has a very straight forward approach to the test limits that should be applied to digital devices for both radiated and conducted emissions tests.

Class A limits should only be applied to a digital device that is marketed for commercial, industrial, or business use. The Class A limits can not be used for equipment that is intended for general public use or use in the home.

Class B limits must be applied to any digital device that is marketed for use in a residential environment.

Unintentional radiators

Tests RequiredEmission
Radiated emissions
Conducted emissions
(UK mains volage)
Various other emission tests
Radiated immunity
Conducted immunity
Various other immunity tests
USARadiated emissions
30MHz-1GHz (or more)
Conducted emissions
(US Mains Voltage)
No requirements