ISO 11451-5:2023 道路車両 — 狭帯域放射電磁エネルギーによる電気的妨害に対する車両試験方法 — Part 5: 残響室 | ページ 5

3.1

mean absorption cross section

ACS

where

		is the absorption cross section for incident waves from a spatial direction averaged over TE and TM waves;
		is the absorption cross section for incident TE waves from a spatial direction;
		is the absorption cross section for incident TM waves from a spatial direction;
		is the solid angle which is for the full sphere (i.e. waves from all angles).

Note 1 to entry: It is the measure for the ability of a vehicle to absorb energy in a reverberation chamber (3.16) . It gives the cross section area of an equivalent ideal absorber without any reflections or scattering, which absorbs the same energy as the vehicle in the reverberation chamber. In contrast to the chamber loading factor (CLF) (3.5) , the ACS is a property of the vehicle only and is the same for all reverberation chambers. Therefore, it allows determination of the necessary extra power to compensate the loading effects by the vehicle without a loading factor measurement or a new chamber characterization with vehicle.

Note 2 to entry: See Annexes H and L.

Note 3 to entry: See Reference [19].

3.2

antenna characterization factor

ACF

ratio of the average received power to forward power obtained in the antenna characterization of the empty chamber characterization

Note 1 to entry: See 8.5.2.

3.3

cavity mode method

method adopting chamber modes to generate the required field strength with less power for the frequency between TLS method (3.22) and the lowest usable frequency (LUF) (3.11) , typically (30-80) MHz ここで, the chamber has a lower mode density

Note 1 to entry: See Annex F.

3.4

chamber characterization factor

CCF

normalized average received power with the vehicle present

Note 1 to entry: See 8.5.2.

3.5

chamber loading factor

CLF

ratio of the antenna characterization factor (3.2) to the chamber characterization factor (3.4)

Note 1 to entry: See 8.5.2.

Note 2 to entry: It is a measure for the additional loading of the chamber due to the test setup including, for example, the vehicle and the support equipment (3.21) .

3.6

chamber time constant

mean time decay of the received power delay profile in a reverberation chamber (3.16)

Note 1 to entry: See Annexes H and L.

3.7

charging mode

mode of operation intended for charging the rechargeable energy storage system (storage system that provides electric energy for electric propulsion which can be recharged)

3.7.1

charging mode 1

charging mode (3.7) where the vehicle is connected to a standard socket-outlet of an AC supply network, utilizing a cable and plug, both of which are not fitted with any supplementary pilot or auxiliary contacts

Note 1 to entry: In some countries, mode 1 charging can be prohibited or requires special precautions.

Note 2 to entry: Charging mode 1 is defined in IEC 61851-1:2017,6.2.1.

3.7.2

charging mode 2

charging mode (3.7) where the vehicle is connected to AC mains using a charging cable, which has an EV supply equipment (EVSE) (3.10) box in-line (e.g. in-cable control box/ in-cable control and protection device), providing control pilot signalling between the vehicle and the EVSE box and personal protection against electric shock

Note 1 to entry: In some countries, special restrictions are applied for mode 2 charging.

Note 2 to entry: There is no communication with the vehicle.

Note 3 to entry: Charging mode 2 is defined in IEC 61851-1:2017,6.2.2.

3.7.3

charging mode 3

charging mode (3.7) where the vehicle is connected to a fixed installation [ EV supply equipment (EVSE) (3.10) , e.g. AC charging station, AC wallbox] providing AC power to the vehicle, with communication between the vehicle and the EVSE (through signal/control lines and/or through wired network lines)

Note 1 to entry: Charging mode 3 is defined in IEC 61851-1:2017,6.2.3.

3.7.4

charging mode 4

charging mode (3.7) where the vehicle is connected to a fixed installation [ EV supply equipment (EVSE) (3.10) , e.g. DC charging station], providing DC power to the vehicle (with an off-board charger), with communication between the vehicle and the EVSE (through signal/control lines and/or through wired network lines)

Note 1 to entry: Charging mode 4 is defined in IEC 61851-1:2017,6.2.4.

3.8

coherence time of the reverberation chamber

time interval between two independent stirring configurations (3.19) in stirred mode (3.18)

Note 1 to entry: The field in the reverberation chamber (3.16) conserves its statistical properties [e.g. the positions of the field maxima and minima in the working volume (3.27) ] during the coherence time.

3.9

CDF

cumulative distribution function

probability that the electromagnetic field strength is less or equal to a specific value

Note 1 to entry: A value of this function can be used as levelling target (e.g. 100 V/m at CDF 0,2 means 20 % of the measured electric field strength values are less or equal to 100 V/m and 80 % are higher than 100 V/m).

3.10

EVSE

EV supply equipment

equipment or a combination of equipment, providing dedicated functions to supply electric energy from a fixed electrical installation or supply network to an EV for the purpose of charging

3.11

lowest usable frequency

LUF

lowest frequency for which the field uniformity requirements are met for the reverb method (3.17) and at least 12 independent stirring configurations (3.19) can be achieved

Note 1 to entry: The LUF is determined in accordance with C.6.

3.12

maximum chamber loading factor

MLF

figure of merit corresponding to the worst case loading configuration for which the field uniformity has been demonstrated

Note 1 to entry: See 8.5.2.

3.13

periodization

method to define an analysis time window for the calculation of autocorrelation coefficients based on the complete period of a periodic stirring process sequence

3.14

power delay profile

PDP

temporal behaviour of the power decay in a reverberation chamber (3.16) after switch-off of the power source

3.15

quasi-tuned mode

operating mode of a reverberation chamber (3.16) where the response time of the DUT to the external field is shorter than the coherence time of the reverberation chamber (3.8)

Note 1 to entry: See D.3.1.

3.16

reverberation chamber

high Q shielded room (cavity) whose boundary conditions are changed via one or several rotating tuners or moving walls (including vibrating intrinsic reverberation chambers (VIRCs) (3.28) with or without conductive contact to the floor) or repositioning of the transmitting antenna(s)

Note 1 to entry: This results in a statistically uniform electromagnetic field.

3.17

reverb method

usage of a reverberation chamber (3.16) above the lowest usable frequency (LUF) (3.11)

3.18

stirred mode

operating mode of a reverberation chamber (3.16) where a tuner (3.25) or a vibrating intrinsic reverberation chamber (VIRC) (3.28) shaker is moved continuously while the test is running

3.19

stirring configuration

unique set of conditions that defines the RF environment

Note 1 to entry: It can stand for a single tuner (3.25) in a fixed position as in classical reverberation chambers (3.16) . In addition, it can stand for a position of a vibrating intrinsic reverberation chamber (VIRC) (3.28) at a point in time, for a momentary frequency in case of frequency stirring, or a transmitting antenna configuration.

3.20

stirring scheme

operating mode of a reverberation chamber (3.16) that is a stirred mode (3.18) or a tuned mode (3.24) or a combination thereof

3.21

support equipment

equipment associated with performing an EMC test on a vehicle including (but not all inclusive) load simulator, charging cables, AMN(s), HV-AN(s), AAN(s), DUT monitoring equipment including fibre optic interface modules and TV camera

3.22

TLS method

method using a TLS (similar as in ISO 11451-2) inside a reverberation chamber (3.16) and which extends the usage beyond TEM-waveguide testing up to the lowest usable frequency (LUF) (3.11) of the reverberation chamber

Note 1 to entry: See Annex E.

3.23

total antenna efficiency

ratio of radiated power to forward power at antenna port, it is less than 1 or 100 % due to mismatching and losses of the antenna (e.g. ohmic loss of metallic material and dielectric loss of insulation)

Note 1 to entry: See Annex J.

3.24

tuned mode

operating mode of a reverberation chamber (3.16) where the tuner (3.25) is moved stepwise to fixed positions and the test is repeated successively at each of those fixed tuner positions

3.25

tuner

large metallic reflector capable of changing the electromagnetic boundary conditions in a reverberation chamber (3.16) as it rotates or moves

Note 1 to entry: As the tuner moves, the nulls and maximums in the field change location, ensuring the vehicle is exposed to a statistically uniform field.

3.26

windowing

method to define an analysis time window for the calculation of autocorrelation coefficients based on a part of a stirring process sequence

3.27

working volume

volume within the reverberation chamber (3.16) that contains the vehicle, the support equipment (3.21) , and the receiving antenna, if used

3.28

VIRC

vibrating intrinsic reverberation chamber

tent-like structure formed by conductive fabrics where movements of the walls are excited, e.g. by moving arms which push and pull corners or edges of the tent