conducted emission vs radiated emission-difference between conducted emission and radiated emission
Emission in the electronic system leads to disturbance to the nearby other systems. There are two main types viz. radiated emission and conducted emission. Radiated emission is the unintentional electromagnetic radiation which will cause interference for the neighbouring systems. As a result they will malfunction. Radiated emission ranges from 30 MHz to 40 GHz.
Conducted emissions are those currents which are passed out through the device's AC power cord. This emission enter into common electrical power network and radiate there more efficiently. Generally conducted emission ranges from 450 KHz to 30 MHz.
The digital devices are the the devices which utilize digital techniques and operates at clock frequency above 9KHz. These digital devices are classified broadly into two major categories viz. class A device and class B device.
Class A devices are marketed to be used in the business and/or industrial environments. Class B devices are marketed to be used in residential environment.
Class B radiation limits are more stringent than the class A. The conducted emission and radiated emission limits recommended by the FCC at different frequencies for class A and class B devices are mentioned in the following tables.
FCC Limit for Radiated Emission-Class A
|30 to 88||100|
|88 to 216||150|
|216 to 960||200|
|960 and above||500|
FCC Limit for Conducted Emission-Class A
|0.45 to 30||250|
FCC Limit for Radiated Emission-Class B
|30 to 88||90|
|88 to 216||150|
|216 to 960||210|
|960 and above||300|
FCC Limit for Conducted Emission-Class B
|0.45 to 1.705||1000|
|1.705 to 30||3000|
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