Vehicle Emission — CISPR 12

CISPR 12 defines the measurement method and limits for radio-frequency interference emitted by vehicles, motorboats and devices with internal combustion engines. The purpose of the measurement is to protect receivers OUTSIDE THE VEHICLE.

The purpose is to show that the vehicle does not disrupt radio and television reception in its surroundings. This standard is the basis for the emission measurements required under UNECE R10 type approval.

• Passenger and commercial vehicles
• Two- and three-wheeled vehicles
• Agricultural and construction machinery
• Motorised watercraft
• Portable equipment with internal combustion engines

• CISPR 12radio interference from vehicles test

Measurement distance

Defined in the standard; generally a fixed distance between the vehicle and the antenna

Frequency range

Broadband and narrowband ranges defined in CISPR 12

Antenna polarisation

Separate measurement in horizontal and vertical polarisation

Vehicle operating mode

Engine running and/or electrical system active

• Semi-anechoic chamber or open-area test site
• Vehicle dynamometer
• EMI receiver and measurement antennas
• Antenna mast and positioning system
• Exhaust extraction system

• The vehicle must be presented ready for testing and operational
• The operating modes to be tested must be defined in advance
• The vehicle's list of electrical equipment must be shared
• It must be sized to fit the chamber and the dynamometer

The measurement programme generally takes a few days; it extends if a large number of operating modes is requested.

1. 1The vehicle is brought into the chamber and placed on the dynamometer.
2. 2The measurement distance and antenna positions are set up.
3. 3The vehicle is placed in the defined operating mode.
4. 4Broadband emission is scanned in horizontal and vertical polarisation.
5. 5Narrowband emission measurements are performed.
6. 6The points of highest emission are measured in detail.
7. 7Results are compared with the limit curves.

Limit values are defined in CISPR 12 and UNECE R10. Whether the result stays below the limit is assessed taking measurement uncertainty into account.

If there is an exceedance, the source is sought at component level; CISPR 25 measurements guide this stage. It must be shown before the test that the ambient noise is sufficiently below the measurement limit.

• Sample description, serial number and configuration
• Applied standard and year of printing
• Selected intensity level and basis for the level
• Experimental setup and measurement points
• Functional checks performed during the experiment
• Observations, measurement results and photographs
• A statement that the result applies only to the specimen submitted for testing

EUROLAB holds internationally recognised accreditation obtained from accreditation bodies party to the IAF and ILAC multilateral recognition arrangements, under ISO/IEC 17025 for laboratory testing, ISO/IEC 17020 for inspection and surveillance, and ISO/IEC 17021-1 and ISO/IEC 17065 for system and product certification. This chain ensures the reports and certificates issued are accepted worldwide.

Whether this test can be offered within accredited scope depends on your product and the standard applied; since accreditation is method-based, the scope is confirmed in writing at the quotation stage.

• UNECE R10
• EU 2018/858 vehicle type approval framework
• EU 167/2013 (agricultural and forestry vehicles)

The section below describes the field that the Vehicle Emission test belongs to; the conditions and acceptance criteria of this particular test are given in the sections above. The scope specific to your product is confirmed in writing at the quotation stage.

• UNECE R10 EMC
• Component Emission
• RF Immunity
• Transient
• Change of Temperature
• UV Ageing
• IP Water Ingress
• IP Dust Ingress
• IP69K
• Free Fall
• Automotive Vibration
• Battery Vibration