22.11.2022
EN
Official Journal of the European Union
L 302/81
3.3.5.
If it is decided to radiate the rear of the vehicle, the reference point shall be established as in paragraphs 3.3.1. to 3.3.4. above.
The vehicle shall then be installed facing away from the antenna and positioned as if it had been horizontally rotated 180o around its centre point, i.e. such that the distance from the antenna to the nearest part of the outer body of the vehicle remains the same.
This is illustrated in Figure 3 of Appendix 1 to this annex.
4.
Test requirements
4.1.
Frequency range, dwell times, polarization.
The vehicle shall be exposed to electromagnetic radiation in the 20 to 2,000 MHz frequency ranges in vertical polarization.
The test signal modulation shall be:
(a) AM (amplitude modulation), with 1 kHz modulation and 80 per cent modulation depth in the 20 to 800 MHz frequency range; and (b) PM (pulse modulation), Ton 577 μs, period 4,600 μs in the 800 to 2,000 MHz frequency range.
If not otherwise agreed between Technical Service and vehicle manufacturer.
Frequency step size and dwell time shall be chosen according to ISO 11451-1.
4.1.1.
The Technical Service shall perform the test at the intervals specified in ISO 11451-1 throughout the frequency range 20 to 2,000 MHz.
Alternatively, if the manufacturer provides measurement to data for the whole frequency band from a test laboratory accredited to the applicable parts of ISO 17025 and recognized by the Type Approval Authority, the Technical Service may choose a reduced number of spot frequencies in the range, e.g. 27, 45, 65, 90, 120, 150, 190, 230, 280, 380, 450, 600, 750, 900, 1,300 and 1,800 MHz to confirm that the vehicle meets the requirements of this annex.
If a vehicle fails the test defined in this annex, it shall be verified as having failed under the relevant test conditions and not as a result of the generation of uncontrolled fields.
5.
Generation of required field strength
5.1.
Test methodology
5.1.1.
The substitution method according to ISO 11451-1, shall be used to establish the test field conditions.
5.1.2.
Calibration For TLS one field probe at the vehicle reference point shall be used.
For antennas four field probes at the vehicle reference line shall be used.