CISPR 25 covers a frequency range of 150 kHz to 2.5 GHz and determines the necessary space needed for testing. This standard was developed in response to the variety of radio receivers that can be installed or used in motor vehicles and deals with "radio disturbance characteristics for the protection of receivers used on-board vehicles, boats, and on devices". CISPR 25 is mostly used by vehicle manufacturers to ensure top performance of receivers mounted on-board the vehicle. There are two parts to CISPR 25, one deals with the full vehicle or system test where the mounted antennas are used to sense noise generated by different electronic systems on the same vehicle, and the other deals with the conducted and radiated measurements of the vehicle's components and modules.
A LISN (line impedance stabilization network) is used to provide an impedance to the power input of the EUT(equipment under test).
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