CISPR 25:2016

CISPR 25 ®
Edition 4.0 2016-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
INT ERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
C OMITÉ INTERNATIONAL SPÉCIAL DES PERTURBATIONS RADIOÉLECTRIQUES

Vehicles, boats and internal combustion engines – Radio disturbance
characteristics – Limits and methods of measurement for the protection of
on-board receivers
Véhicules, bateaux et moteurs à combustion interne – Caractéristiques des
perturbations radioélectriques – Limites et méthodes de mesure pour la
protection des récepteurs embarqués

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CISPR 25 ®
Edition 4.0 2016-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
INT ERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE

C OMITÉ INTERNATIONAL SPÉCIAL DES PERTURBATIONS RADIOÉLECTRIQUES

Vehicles, boats and internal combustion engines – Radio disturbance

characteristics – Limits and methods of measurement for the protection of

on-board receivers
Véhicules, bateaux et moteurs à combustion interne – Caractéristiques des

perturbations radioélectriques – Limites et méthodes de mesure pour la

protection des récepteurs embarqués

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.100.10, 33.100.20 ISBN 978-2-8322-3726-7

– 2 – CISPR 25:2016 © IEC 2016
CONTENTS
FOREWORD . 8
INTRODUCTION . 10
1 Scope . 11
2 Normative references . 12
3 Terms and definitions . 13
4 Requirements common to vehicle and component/module emissions
measurements . 17
4.1 General test requirements . 17
4.1.1 Categories of disturbance sources (as applied in the test plan) . 17
4.1.2 Test plan . 17
4.1.3 Determination of conformance of equipment under test (EUT) with limits . 17
4.1.4 Operating conditions . 18
4.1.5 Test report . 19
4.2 Shielded enclosure . 19
4.3 Absorber-lined shielded enclosure (ALSE) . 19
4.3.1 General . 19
4.3.2 Size . 19
4.3.3 Objects in ALSE . 19
4.3.4 ALSE performance validation . 20
4.4 Measuring instrument. 20
4.4.1 General . 20
4.4.2 Spectrum analyser parameters . 20
4.4.3 Scanning receiver parameters . 23
4.5 Power supply . 25
5 Measurement of emissions received by an antenna on the same vehicle . 26
5.1 Antenna measuring system . 26
5.1.1 Type of antenna . 26
5.1.2 Measuring system requirements . 26
5.2 Method of measurement . 28
5.3 Test setup for vehicle in charging mode . 30
5.3.1 General . 30
5.3.2 AC power charging without communication . 30
5.3.3 AC or DC power charging with communication line(s) or with signal
line(s) . 33
5.4 Examples of limits for vehicle radiated disturbances . 37
6 Measurement of components and modules . 39
6.1 General . 39
6.2 Test equipment . 39
6.2.1 Reference ground plane . 39
6.2.2 Power supply and AN . 40
6.2.3 Load simulator . 40
6.3 Conducted emissions from components/modules – Voltage method . 41
6.3.1 General . 41
6.3.2 Test setup . 41
6.3.3 Test procedure . 42

6.3.4 Limits for conducted disturbances from components/modules – Voltage
method . 46
6.4 Conducted emissions from components/modules – Current probe method . 49
6.4.1 Test setup . 49
6.4.2 Test procedure . 49
6.4.3 Limits for conducted disturbances from components/modules – Current
probe method . 52
6.5 Radiated emissions from components/modules – ALSE method . 54
6.5.1 General . 54
6.5.2 Test setup . 54
6.5.3 Test procedure . 57
6.5.4 Limits for radiated disturbances from components/modules – ALSE
method . 62
6.6 Radiated emissions from components/modules – TEM cell method . 65
6.7 Radiated emissions from components/modules – Stripline method . 65
Annex A (informative) Flow chart for checking the applicability of CISPR 25 . 66
Annex B (normative) Antenna matching unit – Vehicle test. 67
B.1 Antenna matching unit parameters (150 kHz to 6,2 MHz) . 67
B.2 Antenna matching unit – Verification . 67
B.2.1 General . 67
B.2.2 Gain measurement . 67
B.2.3 Test procedure . 67
B.3 Impedance measurement . 67
Annex C (informative) Sheath-current suppressor . 69
C.1 General information . 69
C.2 Suppressor construction . 69
Annex D (informative) Guidance for the determination of the noise floor of active
vehicle antennas in the AM and FM range . 70
Annex E (normative) Artificial networks (AN), artificial mains networks (AMN) and
asymmetric artificial networks (AAN) . 73
E.1 General . 73
E.2 Artificial networks (AN) . 73
E.2.1 Component powered by LV . 73
E.2.2 Component powered by HV . 75
E.2.3 Component involved in charging mode connected to DC power mains . 77
E.2.4 Vehicle in charging mode connected to DC power mains . 77
E.3 Artificial mains networks (AMN) . 77
E.3.1 Component AMN . 77
E.3.2 Vehicle in charging mode connected to AC power mains . 77
E.4 Asymmetric artificial network (AAN) . 78
E.4.1 General . 78
E.4.2 Symmetric communication lines . 78
E.4.3 PLC on power lines. 79
E.4.4 PLC (technology) on control pilot . 80
Annex F (informative) Radiated emissions from components/modules – TEM cell
method . 82
F.1 General . 82
F.2 Test setup . 83
F.2.1 Setup with major field emission from the wiring harness . 83

– 4 – CISPR 25:2016 © IEC 2016
F.2.2 Setup with major field emissions from the EUT . 84
F.2.3 Power supply and AN . 84
F.2.4 Signal/control line filters . 85
F.3 Test procedure . 86
F.4 Limits for radiated disturbances from components/modules – TEM cell
method . 87
F.5 TEM cell design . 89
Annex G (informative) Radiated emissions from components/modules – Stripline
method . 91
G.1 General . 91
G.2 Test setup . 91
G.2.1 General . 91
G.2.2 Stripline impedance matching . 91
G.2.3 Location of the EUT . 92
G.2.4 Location and length of the test harness . 92
G.2.5 Location of the load simulator . 92
G.3 Test procedure . 92
G.4 Limits for radiated emissions from components/modules – Stripline method . 93
G.5 Stripline design . 96
Annex H (informative) Interference to mobile radio communication in the presence of
impulsive noise – Methods of judging degradation . 99
H.1 General . 99
H.2 Survey of methods of judging degradation to radio channel . 99
H.2.1 General . 99
H.2.2 Subjective tests . 99
H.2.3 Objective tests . 100
H.2.4 Conclusions relating to judgement of degradation . 101
Annex I (normative) Test methods for shielded power supply systems for high voltages
in electric and hybrid vehicles . 102
I.1 General . 102
I.2 Conducted emission from components/modules on HV power lines – Voltage
method . 102
I.2.1 Ground plane arrangement . 102
I.2.2 Test set-up . 103
I.2.3 Limits for conducted emission – Voltage method. 108
I.3 Conducted emission from components/modules on HV power lines – current
probe method . 110
I.3.1 Reference ground plane arrangement . 110
I.3.2 Test setup . 110
I.3.3 Limits for conducted emission – current probe method. 115
I.4 Radiated emissions from components/modules – ALSE method . 115
I.4.1 Reference ground plane arrangement . 115
I.4.2 Test setup . 115
I.4.3 Limits for radiated emissions – ALSE method . 120
I.5 Coupling between HV and LV systems . 120
I.5.1 General . 120
I.5.2 Measurement based on test setups defined in Clause 6 . 120
I.5.3 Measurement of the HV-LV coupling attenuation . 126
Annex J (informative) ALSE performance validation 150 kHz to 1 GHz . 129
J.1 General . 129

J.2 Reference measurement method . 131
J.2.1 Overview . 131
J.2.2 Equipment . 131
J.2.3 Procedure . 133
J.2.4 Requirements . 137
J.3 Modelled long wire antenna method . 137
J.3.1 Overview . 137
J.3.2 Equipment . 138
J.3.3 Procedure . 140
J.3.4 Requirements . 149
Annex K (informative) Items under consideration . 151
K.1 General . 151
K.2 Measurement techniques and limits . 151
K.3 Measurement uncertainty . 151
K.4 Reconsideration of the Scope of the standard . 151
K.5 Digital Service bands . 151
K.6 Reorganizing the document into separate parts similar to CISPR-16
document series . 151
Bibliography . 152

Figure 1 – Method of determination of conformance for all frequency bands . 18
Figure 2 – Example of gain curve . 27
Figure 3 – Vehicle-radiated emissions – Example for test layout (end view with
monopole antenna) . 29
Figure 4 – Example of test setup for vehicle with plug located on vehicle side (AC
powered without communication) . 31
Figure 5 – Example of test setup for vehicle with plug located front / rear of vehicle (AC
powered without communication) . 32
Figure 6 – Example of test setup for vehicle with plug located on vehicle side (AC or
DC powered with communication) . 35
Figure 7 – Example of test setup for vehicle with plug located front /rear of vehicle (AC
or DC powered with communication) . 36
Figure 8 – Average limit for radiated disturbance from vehicles . 39
Figure 9 – Conducted emissions – Example of test setup for EUT with power return
line remotely grounded . 43
Figure 10 – Conducted emissions – Example of test setup for EUT with power return
line locally grounded . 44
Figure 11 – Conducted emissions – Example of test setup for alternators and
generators . 45
Figure 12 – Conducted emissions – Example of test setup for ignition system
components . 46
Figure 13 – Conducted emissions – Example of test setup for current probe
measurements . 51
Figure 14 – Test harness bending requirements . 56
Figure 15 – Example of test setup – Rod antenna . 58
Figure 16 – Example of test setup – Biconical antenna . 59
Figure 17 – Example of test setup – Log-periodic antenna . 60
Figure 18 – Example of test setup – Above 1 GHz . 61
Figure 19 – Example of average limit for radiated disturbances from components . 64

– 6 – CISPR 25:2016 © IEC 2016
Figure A.1 – Flow chart for checking the applicability of this standard . 66
Figure B.1 – Verification setup . 68
Figure C.1 – Characteristic S of the ferrite core . 69
Figure D.1 – Vehicle test setup for equipment noise measurement in the AM/FM range . 71
Figure D.2 – Vehicle test setup for antenna noise measurement in the AM/FM range . 72
Figure E.1 – Example of 5 µH AN schematic . 74
Figure E.2 – Characteristics of the AN impedance Z . 74
PB
Figure E.3 – Example of 5 µH HV AN schematic . 76
Figure E.4 – Example of 5 µH HV AN combination in a single shielded box . 76
Figure E.5 – Impedance matching network attached between HV ANs and EUT . 77
Figure E.6 – Example of an AAN for symmetric communication lines . 79
Figure E.7 – Example of AAN circuit of PLC on AC or DC powerlines . 80
Figure E.8 – Example of an AAN circuit for PLC on pilot line . 81
Figure F.1 – TEM cell (example) . 82
Figure F.2 – Example of arrangement of leads in the TEM cell and to the connector
panel . 83
Figure F.3 – Example of the arrangement of the connectors, the lead frame and the
dielectric support . 84
Figure F.4 – Example for the required minimum attenuation of the signal / control line
filters . 85
Figure F.5 – Setup for measurement of the filter attenuation . 85
Figure F.6 – Example of the TEM cell method test setup . 86
Figure F.7 – TEM cell . 89
Figure G.1 – Example of a basic stripline test setup in a shielded enclosure . 93
Figure G.2 – Example for a 50 Ω stripline . 97
Figure G.3 – Example for a 90 Ω stripline . 98
Figure I.1 – Conducted emission – Example of test setup for EUTs with shielded power
supply systems . 105
Figure I.2 – Conducted emission – Example of test setup for EUTs with shielded
power supply systems with electric motor attached to the bench . 106
Figure I.3 – Conducted emission – Example of test setup for EUTs with shielded power
supply systems and inverter/charger device . 107
Figure I.4 – Conducted emission – Example of test setup current probe measurement
on HV lines for EUTs with shielded power supply systems . 112
Figure I.5 – Conducted emission – Example of test setup current probe measurement
on HV lines for EUTs with shielded power supply systems with electric motor attached
to the bench . 113
Figure I.6 – Conducted emission – Example of test setup current probe measurement
on HV lines for EUTs with shielded power supply systems and inverter/charger device . 114
Figure I.7 – Radiated emission – Example of test setup measurement with biconical
antenna for EUTs with shielded power supply systems . 117
Figure I.8 – Radiated emission – Example of test setup measurement with biconical
antenna for EUTs with shielded power supply systems with electric motor attached to
the bench . 118
Figure I.9 – Radiated emission – Example of test setup measurement with biconical
antenna for EUTs with shielded power supply systems and inverter/charger device . 119
Figure I.10 – Test setup for calibration of the test signal . 121

Figure I.11 – Example of test setup for conducted emissions – Voltage method –
Measurement on LV ports with injection on HV supply ports . 122
Figure I.12 – Example of test setup for conducted emissions – Current probe method –
Measurement on LV ports with injection on HV supply ports . 123
Figure I.13 – Example of test setup for radiated emissions – ALSE method –
Measurement with biconical antenna with injection on HV supply ports . 125
Figure I.14 – Test setup for EUT S measurements . 127
Figure I.15 – Examples of requirements for coupling attenuation, a . 128
c
Figure J.1 – Examples of typical ALSE influence parameters over the 10 MHz to 100
MHz frequency range . 130
Figure J.2 – Visual representation of ALSE performance validation process . 131
Figure J.3 – Example of construction of a transmitting monopole . 132
Figure J.4 – Side view of the antenna configuration for reference measurement below

30 MHz . 134
Figure J.5 – Top view of antenna configuration for reference measurement 30 MHz and
above (with the biconical antenna shown as example) . 135
Figure J.6 – Side view of antenna configuration for reference measurement 30 MHz
and above (with the biconical antenna shown as example) . 135
Figure J.7 – Top view of antenna configuration for the ALSE measurement below
30 MHz . 136
Figure J.8 – Metallic sheet angles used as support for the rod . 139
Figure J.9 – Radiator side view 50 Ω terminations . 139
Figure J.10 – Photo of the radiator mounted on the ground reference plane . 139
Figure J.11 – Example VSWR measured from four radiation sources (without 10 dB
attenuator) . 140
Figure J.12 – Example setup for ALSE equivalent field strength measurement (rod
antenna shown for the frequency range below 30 MHz) . 142
Figure J.13 – MoM-modell for the frequency range 30 MHz to 200 MHz . 144

Table 1 – Spectrum analyser parameters . 22
Table 2 – Scanning receiver parameters . 24
Table 3 – Antenna types . 26
Table 4 – Example for limits of disturbance – Complete vehicle . 37
Table 5 – Examples of limits for conducted disturbances – Voltage method . 48
Table 6 – Examples of limits for conducted disturbances – Current probe method . 53
Table 7 – Examples of limits for radiated disturbances – ALSE method. 63
Table E.1 – Magnitude of the AN impedance Z . 75
PB
Table F.1 – Examples of limits for radiated disturbances – TEM cell method . 88
Table F.2 – Dimensions for TEM cells . 90
Table G.1 – Examples of limits for radiated disturbances – Stripline method . 95
Table I.1 – Example for HV limits for conducted voltage measurements at shielded
power supply devices (HV-LV decoupling class A5) . 109
Table I.2 – Example of configurations for equipment without negative LV line . 127
Table I.3 – Example of configurations for equipment with negative LV line . 127
Table I.4 – Examples of requirements for minimum coupling attenuation, a . 128
c
Table J.1 – Reference data to be used for chamber validation . 145

– 8 – CISPR 25:2016 © IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
____________
VEHICLES, BOATS AND INTERNAL COMBUSTION ENGINES –
RADIO DISTURBANCE CHARACTERISTICS –
LIMITS AND METHODS OF MEASUREMENT FOR
THE PROTECTION OF ON-BOARD RECEIVERS

FOREWORD
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard CISPR 25 has been prepared by CISPR subcommittee D:
Electromagnetic disturbances related to electric/electronic equipment on vehicles and internal
combustion engine powered devices.
This fourth edition cancels and replaces the third edition published in 2008. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) inclusion of charging mode for electric vehicles (EV) and plug-in electric vehicles (PHEV),
b) the methods for chamber validation have been included,

c) test methods for shielded power supply systems for high voltages for electric and hybrid
electric vehicles have been included,
d) overall improvement.
The text of this standard is based on the following documents:
FDIS Report on voting
CISPR/D/432/FDIS CISPR/D/435/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
The contents of the corrigendum of October 2017 have been included in this copy.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
– 10 – CISPR 25:2016 © IEC 2016
INTRODUCTION
This International Standard is designed to protect on-board receivers from disturbances
produced by conducted and radiated emissions arising in a vehicle.
Test procedures and limits given
...