CISPR 25-2008 Vehicles, boates and internal combustion engines - Radio disturbance characteristics - Limits and methods of measurement for the protection of on-board receivers
This International Standard contains limits and procedures for the measurement of radio
disturbances in the frequency range of 150 kHz to 2 500 MHz. The standard applies to any
electronic/electrical component intended for use in vehicles, trailers and devices. Refer to
International Telecommunications Union (ITU) publications for details of frequency
allocations. The limits are intended to provide protection for receivers installed in a vehicle
from disturbances produced by components/modules in the same vehicle. The method and
limits for a complete vehicle are in Clause 5 and the methods and limits for
components/modules are in Clause 6. Only a complete vehicle test can be used to determine
the component compatibility with respect to a vehicle's limit.
The receiver types to be protected are, for example, broadcast receivers (sound and
television), land mobile radio, radio telephone, amateur, citizens' radio, Satellite Navigation
(GPS, etc.) and Bluetooth. For the purpose of this standard, a vehicle is a machine, which is
self-propelled. Vehicles include (but are not limited to) passenger cars, trucks, agricultural
tractors and snowmobiles. Annex A provides guidance in determining whether this standard is
applicable to particular equipment.
The limits in this standard are recommended and subject to modification as agreed between
the vehicle manufacturer and the component supplier. This standard is also intended to be
applied by manufacturers and suppliers of components and equipment which are to be added
and connected to the vehicle harness or to an on-board power connector after delivery of the
vehicle.
This International Standard does not include protection of electronic control systems from
radio frequency (RF) emissions, or from transient or pulse-type voltage fluctuations. These
subjects are included in ISO publications.
Since the mounting location, vehicle body construction and harness design can affect the
coupling of radio disturbances to the on-board radio, Clause 6 of this standard defines
multiple limit levels. The level class to be used (as a function of frequency band) is agreed
upon between the vehicle manufacturer and the component supplier.
CISPR 25 defines test methods for use by vehicle manufacturers and suppliers, to assist in
the design of vehicles and components and ensure controlled levels of on-board radio
frequency emissions.
Vehicle test limits are provided for guidance and are based on a typical radio receiver using
the antenna provided as part of the vehicle, or a test antenna if a unique antenna is not
specified. The frequency bands that are defined are not applicable to all regions or countries
of the world. For economic reasons, the vehicle manufacturer must be free to identify what
frequency bands are applicable in the countries in which a vehicle will be marketed and which
radio services are likely to be used in that vehicle.
As an example, many vehicle models will probably not have a television receiver installed; yet
the television bands occupy a significant portion of the radio spectrum. Testing and mitigating
noise sources in such vehicles is not economically justified.
The vehicle manufacturer should define the countries in which the vehicle is to be marketed,
then choose the applicable frequency bands and limits. Component test parameters can then
be selected from ClSPR 25 to support the chosen marketing plan.
CISPR 25-2008 Referenced Document
CISPR 12-2007 Vehicles, boats, and internal combustion engines - Radio disturbance characteristics - Limits and methods of measurement for the protection of off-board receivers
CISPR 16-1-1-2006 Specification for radio disturbance and immunity measuring apparatus and methods – Part 1-1:Radio disturbance and immunity measuring apparatus – Measuring apparatus
CISPR 16-1-2-2003 Specification for radio disturbance and immunity measuring apparatus and methods - Part 1-2:Radio disturbance and immunity measuring apparatus - Ancillary equipment - Conducted disturbances
CISPR 16-1-4-2007 Specification for radio disturbance and immunity measuring apparatus and methods – Part 1-4: Radio disturbance and immunity measuring apparatus – Ancillary equipment – Radiated disturbances
CISPR 25-2008 history
2021CISPR 25:2021 Vehicles, boats and internal combustion engines - Radio disturbance characteristics - Limits and methods of measurement for the protection of on-board receivers
2016CISPR 25:2016 Vehicles, boats and internal combustion engines - Radio disturbance characteristics - Limits and methods of measurement for the protection of on-board receivers
2008CISPR 25:2008 Vehicles, boats and internal combustion engines - Radio disturbance characteristics - Limits and methods of measurement for the protection of on-board receivers
1970CISPR 25:2002 Radio disturbance characteristics for the protection of receivers used on board vehicles, boats, and on devices - Limits and methods of measurement
1995CISPR 25:1995 Limits and methods of measurement of radio disturbance characteristics for the protection of receivers used on board vehicles