Component Emission — CISPR 25

CISPR 25 defines the measurement methods and class-based limits for radio-frequency interference emitted and conducted along cables by electrical and electronic components fitted to a vehicle. The purpose of the measurement is to protect receivers INSIDE THE VEHICLE.

The purpose is to show, at the component stage, that a component will not disrupt in-vehicle receivers such as radio, GPS or keyless entry once fitted to the vehicle. Finding the problem at the complete-vehicle stage is far more costly.

• Electronic control units
• Electric motors and drives
• DC/DC converters and charging units
• Lighting drivers
• Sensor and actuator modules

• CISPR 25Radio degradation of in-car components test

Class

CISPR 25 limits are divided into classes; the class comes from the vehicle manufacturer's specification

Measurement type

Conducted (voltage/current probe) and radiated emission

Wiring harness

At the length and layout defined in the standard

Reference ground plane

Set up at the height defined above the ground plane

• Anechoic chamber and test table with a ground plane
• LISN (artificial-mains-network) units
• EMI receiver, current probe and antennas
• Load simulator operating the component
• Ferrite and filtering equipment

• The component must be presented together with its wiring harness and load simulator
• The operating modes and the conditions where the highest emission is expected must be stated
• The declared CISPR 25 class must be specified
• The wiring-harness length must conform to the standard

A typical component measurement takes a few days; the duration increases for multi-mode products.

1. 1The component is set up on the ground plane in accordance with the standard.
2. 2The LISNs and load simulator are connected.
3. 3Ambient noise is measured.
4. 4Conducted emission is scanned with a voltage and current probe.
5. 5Radiated emission is measured with different antenna types.
6. 6The measurement is repeated in all of the component's defined modes.
7. 7Results are compared with the class limits.

Limit curves are defined in CISPR 25 on a class basis; the vehicle manufacturer's specification determines which class applies.

Setup geometry is the most critical factor determining the result in this measurement; small differences in cable layout create a change of several dB. Setup photographs are therefore expected to be included in the report.

• 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 (ESA approval)
• Vehicle-manufacturer EMC specifications
• IATF 16949 product-approval requirements

The section below describes the field that the Component 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
• Vehicle Emission
• RF Immunity
• Transient
• Change of Temperature
• UV Ageing
• IP Water Ingress
• IP Dust Ingress
• IP69K
• Free Fall
• Automotive Vibration
• Battery Vibration