RF Immunity – ISO 11452

What Is RF Immunity — ISO 11452?

The ISO 11452 series defines several methods for testing the immunity of vehicle electrical and electronic components to narrowband electromagnetic fields: antenna in an anechoic chamber (Part 2), TEM cell (Part 3), current injection/BCI (Part 4), stripline (Part 5) and portable transmitter (Part 9), among others.

Purpose of RF Immunity — ISO 11452

The purpose is to show that the component operates without being affected by radio transmitters, two-way radios and mobile devices in the vehicle's surroundings. For components carrying a safety function, this test is direct safety evidence.

Which Products Is RF Immunity — ISO 11452 Applied To?

Electronic control units
Brake, steering and driver-assistance components
Sensors and actuators
Instrument-cluster and infotainment units
Battery management systems

In Which Sectors Is RF Immunity — ISO 11452 Used?

AutomotiveElectric VehicleBatteryElectronics

Standards Related to RF Immunity — ISO 11452

ISO 11452radiated field immunity in vehicles test

RF Immunity — ISO 11452 Conditions

Method: The relevant part of ISO 11452 according to frequency range and component type
Field strength: From the vehicle manufacturer's specification; the standard defines the method, not the level
Modulation: Defined in the specification (e.g. amplitude modulation)
Functional-status class: The class in which the component must remain is specified in the specification

Equipment for RF Immunity — ISO 11452

Anechoic chamber and field-generating antennas
Broadband power amplifiers
TEM cell and stripline rigs
BCI current-injection probes
Field probe and function-monitoring system

Sample Requirements for RF Immunity — ISO 11452

Must be supplied with component wiring harness and load simulator
The functions to be monitored and the acceptable functional status must be defined
The specification or target level must be stated
An optical or filtered monitoring interface is preferred

Duration of RF Immunity — ISO 11452

It varies from several days to several weeks depending on the method and frequency range. Duration extends if many functions are monitored.

RF Immunity — ISO 11452 Procedure

1The ISO 11452 part to be applied and the level are determined.
2The component is set up in accordance with the standard and connected to the load simulator.
3The functions to be monitored are defined and monitoring is set up.
4Field calibration is performed.
5The frequency range is scanned in defined steps.
6The functional status is recorded at each frequency.
7Frequencies where degradation is observed are examined in detail.

RF Immunity — ISO 11452 Acceptance Criteria

Acceptance is the component remaining within the functional-status class defined in the specification. Class definitions (e.g. function not degrading, or degrading and recovering on its own) are given in the vehicle manufacturer's specification.

Evaluation of Results

Function monitoring itself must not be affected by the field; fibre-optic monitoring is therefore preferred. At frequencies where degradation is observed, cable layout and grounding are examined to find the root cause.

RF Immunity — ISO 11452 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

Accreditation

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.

Scope and authorisations

Related Regulations

UNECE R10
Safety analyses under ISO 26262
Vehicle-manufacturer EMC specifications

Standard-Based Tests — What Does This Group of Pages Cover?

The section below describes the field that the RF Immunity 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.

Standard-based tests are test pages whose address comes from a standard number. What the user is looking for is often not the name of the test but the code written in their specification: not "salt spray test" but "ASTM B117", not "drop test" but "IEC 60068-2-31", not "vibration" but "MIL-STD-810 Method 514".

This preference reflects the reality in the field. An engineer sees a code in the specification received from a customer and searches for that code; they do not need to know the name of the test. The code is the identity of the test and distinguishes the different adoptions of the same test by different bodies.

This group addresses the different adoptions of the SAME TEST separately. The same physical phenomenon may be published under different numbers by ISO, ASTM, EN, IEC, DIN and JIS. Even where the numbers are the same (as with ISO 6892-1 and EN ISO 6892-1), specimen preparation, conditions, calculation details and reporting may differ; adoptions may carry national annexes. The code written in the specification therefore governs, and "similar" is not accepted.

Searching at code level meets a different need from searching at scope level. A user searching for "corrosion testing" wants to learn about the field; a user searching for "ASTM B117" has a specification in hand and wants to know the feasibility, duration and price of that test. Two different intents require two different page structures.

The page for a code describes the scope of that code, the test field it belongs to, the product groups in which it is required and how it differs from neighbouring codes. Test conditions, durations and acceptance criteria are NOT CARRIED: these are defined in the copyrighted text of the standard and in the product specification. This boundary is a deliberate choice; a wrong duration or acceptance criterion means directly incorrect work.

Different parts of the same code and different adoptions of the same number are linked between pages. A user searching for IEC 60335 also sees 60335-2-40; a user searching for ISO 6892-1 also sees the EN ISO 6892-1 and DIN EN ISO 6892-1 adoptions. These links are derived from the number of the code rather than written by hand.

The edition year is NOT CARRIED in the library. It is held as "ASTM D638" rather than "ASTM D638-22", because the edition in force changes over time and the address of the page should not age with the edition. If a year is stated in your specification, that edition governs; if not, the most current edition is applied.

Method groups in this field

Searching by code
Direct search for the code written in the specification; it is found in the library with its code, scope title and issuing body.
Searching by scope title
A test whose code is not known is searched by its subject; a search for "salt spray" brings up the related codes.
Series and part relationships
The other parts of the same series are shown, derived from the number of the code.
Adoption relationships
Different bodies' adoptions of the same number are matched; the claim is kept limited to "the same number".
Superseded codes
Withdrawn codes are not held in the library but, when searched for, the user is directed to the counterpart in force.

Commonly confused in this field

Different adoptions of the same number are not identical texts; they may carry national annexes.
The code written in the specification governs; a technically similar code cannot be substituted.
If an edition year is stated, that edition is applied; the most current edition is not automatically accepted.
A code page carries no test conditions or acceptance criteria; these are in the copyrighted text of the standard and in the product specification.
A part code (for example -2-40) may not be sufficient on its own; the general part of the series is applied as well.

Which decisions these results support

Matching the code written in the specification to the correct laboratory scope
Distinguishing between equivalent adoptions
Clarifying the scope and edition at the quotation stage
Finding the current counterpart of withdrawn codes

Related Tests

Frequently Asked Questions About RF Immunity — ISO 11452

Which part of ISO 11452 should be used?

Frequency range and component size are decisive. BCI is common at low frequencies and the antenna method at high frequencies; the specification generally states the part directly.

What does functional-status class mean?

It is a graded criterion defining how much the component may degrade under the field. The strictest class is required for components carrying a safety function.