SIST EN 55012:2008
Vehicles, boats and internal combustion engines - Radio disturbance characteristics - Limits and methods of measurement for the protection of off-board receivers
Vehicles, boats and internal combustion engines - Radio disturbance characteristics - Limits and methods of measurement for the protection of off-board receivers
The limits in this International Standard are designed to provide protection for broadcast receivers in the frequency range of 30 MHz to 1 000 MHz when used in the residential environment. Compliance with this standard may not provide adequate protection for new types of radio transmissions or receivers used in the residential environment nearer than 10 m to the vehicle, boat or device. This standard applies to the emission of electromagnetic energy which may cause interference to radio reception and which is emitted from a) vehicles propelled by an internal combustion engine, electrical means or both (see 3.1); b) boats propelled by an internal combustion engine, electrical means or both (see 3.2). Boats are to be tested in the same manner as vehicles except where they have unique characteristics as explicitly stated in this standard; c) devices equipped with internal combustion engines (see 3.3). See Annex G for a flow chart to help determine the applicability of CISPR 12. This standard does not apply to aircraft, traction systems (railway, tramway and electric trolley bus), or to incomplete vehicles. In the case of a dual-mode trolley bus (e.g. propelled by power from either a.c./d.c. mains or an internal combustion engine), the internal combustion propulsion system must be included, but the a.c./d.c. mains portion of the vehicle propulsion system is excluded from this standard. NOTE 2 Protection of receivers used on board the same vehicle as the disturbance source(s) are covered by CISPR 25. The measurement of electromagnetic disturbances while the vehicle is connected to power mains for charging is not covered in this standard. The user is referred to appropriate IEC and CISPR standards which define measurement techniques and limits for this condition. Annex H lists work being considered for future revisions.
Fahrzeuge, Boote und von Verbrennungsmotoren angetriebene Geräte - Funkstöreigenschaften - Grenzwerte und Messverfahren zum Schutz von außerhalb befindlichen Empfängern
Véhicules, bateaux et moteurs à combustion interne - Caractéristiques de perturbation radioélectrique - Limites et méthodes de mesure pour la protection des récepteurs extérieurs
Vozila, plovila in naprave, ki jih poganjajo motorji z notranjim zgorevanjem - Karakteristike občutljivosti za radijske motnje - Mejne vrednosti in merilne metode za zaščito sprejemnikov, ki niso neposredno vgrajeni (CISPR 12:2007)
Mejne vrednosti v tem mednarodnem standardu so zasnovane za zagotavljanje zaščite sprejemnikov radiodifuzije v frekvenčnem razponu od 30 MHz do 1000 MHz pri uporabi v bivalnih okoljih. Skladnost s tem standardom morda ne bo zagotovila primerne zaščite za nove tipe radijskega oddajanja in sprejemanja, ki se uporabljajo v bivalnih okoljih, ki so bližje vozilu, plovilu ali napravi od 10 m. Ta standard velja za oddajanje elektromagnetne energije, ki lahko povzroči interferenco pri radijskem sprejemu in ki se oddaja iz a) vozil, ki jih poganjajo motorji z notranjim izgorevanjem, električna sredstva ali oboje (glej točko 3.1.); plovila, ki jih poganjajo motorji z notranjim izgorevanjem, električna sredstva ali oboje (glej točko 3.2). Plovila je potrebno preskusiti na isti način kot vozila, razen kadar imajo edinstvene značilnosti, kot je izrecno navedeno v tem standardu; c) naprave, opremljene z motorjem z notranjim izgorevanjem (glej točko 3.3). Glej Dodatek G za shematski prikaz, ki pomaga pri ugotavljanju uporabnosti CISPR 12. Ta standard ne velja za zračna plovila, sisteme vleke (železnica, tramvaj in električni trolejbus) ali za nepopolna vozila. V primeru trolejbusa z dvema načinoma delovanja (npr. ki ga poganja energija bodisi iz izmenične ali enosmerne napeljave ali motor z notranjim izgorevanjem), mora biti vključen sistem notranjega izgorevanja za pogon, vendar je del pogonskega sistema vozila, ki ga predstavljajo izmenične ali enosmerne napeljave, izključen iz tega standarda. OPOMBA 2: Zaščita sprejemnikov, uporabljena v istem vozilu kot vir motenj, je zajeta v CISPR 25. Merjenje elektromagnetnih motenj, medtem ko je vozilo povezano z električnimi napeljavami za napajanje, ni zajeto v tem standardu. Uporabnik naj upošteva primerne IEC in CISPR standarde, ki opredeljujejo tehnike merjenja in omejitve tega pogoja. Dodatek H navaja delo, ki se bo upoštevalo v prihodnjih revizijah.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 55012:2008
01-februar-2008
1DGRPHãþD
SIST EN 55012:2003
SIST EN 55012:2003/A1:2005
9R]LODSORYLODLQQDSUDYHNLMLKSRJDQMDMRPRWRUML]QRWUDQMLP]JRUHYDQMHP
.DUDNWHULVWLNHREþXWOMLYRVWL]DUDGLMVNHPRWQMH0HMQHYUHGQRVWLLQPHULOQHPHWRGH
]D]DãþLWRVSUHMHPQLNRYNLQLVRQHSRVUHGQRYJUDMHQL &,635
Vehicles, boats and internal combustion engines - Radio disturbance characteristics -
Limits and methods of measurement for the protection of off-board receivers
Fahrzeuge, Boote und von Verbrennungsmotoren angetriebene Geräte -
Funkstöreigenschaften - Grenzwerte und Messverfahren zum Schutz von außerhalb
befindlichen Empfängern
Véhicules, bateaux et moteurs a combustion interne - Caractéristiques de perturbation
radioélectrique - Limites et méthodes de mesure pour la protection des récepteurs
extérieurs
Ta slovenski standard je istoveten z: EN 55012:2007
ICS:
27.020
33.100.10
SIST EN 55012:2008 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
EUROPEAN STANDARD
EN 55012
NORME EUROPÉENNE
November 2007
EUROPÄISCHE NORM
ICS 27.020; 33.100.10 Supersedes EN 55012:2002 + A1:2005
English version
Vehicles, boats and internal combustion engines -
Radio disturbance characteristics -
Limits and methods of measurement
for the protection of off-board receivers
(CISPR 12:2007)
Véhicules, bateaux et Fahrzeuge, Boote und
moteurs à combustion interne - von Verbrennungsmotoren
Caractéristiques angetriebene Geräte -
de perturbation radioélectrique - Funkstöreigenschaften -
Limites et méthodes de mesure Grenzwerte und Messverfahren
pour la protection zum Schutz von außerhalb
des récepteurs extérieurs befindlichen Empfängern
(CISPR 12:2007) (CISPR 12:2007)
This European Standard was approved by CENELEC on 2007-09-01. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 55012:2007 E
---------------------- Page: 2 ----------------------
EN 55012:2007 - 2 -
Foreword
The text of document CISPR/D/322/CDV, future edition 6 of CISPR 12, prepared by CISPR SC D,
Electromagnetic disturbances related to electric/electronic equipment on vehicles and internal combustion
engine powered devices, was submitted to the IEC-CENELEC parallel Unique Acceptance Procedure
and was approved by CENELEC as EN 55012 on 2007-09-01.
This European Standard supersedes EN 55012:2002 + A1:2005.
The following changes were made with respect to EN 55012:2002 + A1:2005:
– deletion of narrowband / broadband determination;
– general improvement of wording.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
(dop) 2008-06-01
national standard or by endorsement
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2010-09-01
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and covers essential requirements of
EC Directive EMC (2004/108/EC). See Annex ZZ.
Annexes ZA and ZZ have been added by CENELEC.
__________
Endorsement notice
The text of the International Standard CISPR 12:2007 was approved by CENELEC as a European
Standard without any modification.
__________
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- 3 - EN 55012:2007
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year
1)
IEC 60050-161 - International Electrotechnical Vocabulary - -
(IEV) -
Chapter 161: Electromagnetic compatibility
CISPR 16-1-1 2006 Specification for radio disturbance and EN 55016-1-1 2007
immunity measuring apparatus and methods -
Part 1-1: Radio disturbance and immunity
measuring apparatus - Measuring apparatus
CISPR 16-1-3 2004 Specification for radio disturbance and EN 55016-1-3 2006
immunity measuring apparatus and methods -
Part 1-3: Radio disturbance and immunity
measuring apparatus - Ancillary equipment -
Disturbance power
CISPR 16-1-4 2007 Specification for radio disturbance and EN 55016-1-4 2007
immunity measuring apparatus and methods -
Part 1-4: Radio disturbance and immunity
measuring apparatus - Ancillary equipment -
Radiated disturbances
CISPR 16-2-3 2006 Specification for radio disturbance and EN 55016-2-3 2006
immunity measuring apparatus and methods -
Part 2-3: Methods of measurement of
disturbances and immunity - Radiated
disturbance measurements
1) 2)
CISPR 25 - Radio disturbance characteristics for the EN 55025 2003
protection of receivers used on board
vehicles, boats, and on devices -
Limits and methods of measurement
1)
Undated reference.
2)
Valid edition at date of issue.
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EN 55012:2007 - 4 -
Annex ZZ
(informative)
Coverage of Essential Requirements of EC Directives
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and within its scope the standard covers all
relevant essential requirements as given in Annex I, Article 1(a) of the EC Directive 2004/108/EC.
Compliance with this standard provides one means of conformity with the specified essential
requirements of the Directive concerned.
WARNING: Other requirements and other EC Directives may be applicable to the products falling within
the scope of this standard.
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INTERNATIONAL
CISPR
ELECTROTECHNICAL
12
COMMISSION
COMMISSION
Sixth edition
ÉLECTROTECHNIQUE
Sixième édition
2007-05
INTERNATIONALE
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
COMITÉ INTERNATIONAL SPÉCIAL DES PERTURBATIONS RADIOÉLECTRIQUES
Vehicles, boats and internal combustion engines –
Radio disturbance characteristics –
Limits and methods of measurement for the
protection of off-board receivers
Véhicules, bateaux et
moteurs à combustion interne –
Caractéristiques de perturbation radioélectrique –
Limites et méthodes de mesure pour la protection
des récepteurs extérieurs
PRICE CODE
XA
Commission Electrotechnique Internationale CODE PRIX
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue
Pour prix, voir catalogue en vigueur
---------------------- Page: 6 ----------------------
– 2 – CISPR 12 © IEC:2007
CONTENTS
FOREWORD.5
INTRODUCTION.7
1 Scope.8
2 Normative references .9
3 Terms and definitions .9
4 Limits of disturbance .11
4.1 Determination of conformance of vehicle/boat/device with limits.11
4.2 Peak and quasi-peak detector limits .13
4.3 Average detector limit.13
5 Methods of measurement .14
5.1 Measuring instrument .14
5.1.1 Spectrum analyser parameters .15
5.1.2 Scanning receiver parameters .15
5.1.3 Antenna types .16
5.1.4 Accuracy .16
5.2 Measuring location requirements .17
5.2.1 Outdoor test site (OTS) requirements .17
5.2.2 Absorber lined shielded enclosure (ALSE) requirements.19
5.2.3 Antenna requirements .20
5.3 Test object conditions.22
5.3.1 General .22
5.3.2 Vehicles and boats .22
5.3.3 Devices .23
5.4 Data collection .24
6 Methods of checking for compliance with CISPR requirements .24
6.1 General .24
6.2 Application of limit curves.24
6.2.1 Measurements under dry conditions .24
6.2.2 Measurements under wet conditions.24
6.3 Evaluation (general) .25
6.4 Type approval test.25
6.4.1 Single sample.25
6.4.2 Multiple samples (optional) .25
6.5 Surveillance (quality audit) of series production.25
6.5.1 Single sample.25
6.5.2 Multiple samples (optional) .25
6.6 Quick prototype check for development testing (optional, quasi-peak detector
25
emissions only) .
Annex A (normative) Statistical analysis of the results of measurements .26
Annex B (normative) Procedure to determine an alternative emission limit for
measurements at 3 m antenna distance.28
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CISPR 12 © IEC:2007 – 3 –
Annex C (informative) Antenna and transmission line maintenance and
characterization .30
Annex D (informative) Construction features of motor vehicles affecting the emission
of ignition noise .35
Annex E (informative) Measurement of the insertion loss of ignition noise suppressors.36
Annex F (informative) Methods of measurement to determine the attenuation
characteristics of ignition noise suppressors for high voltage ignition systems .42
Annex G (informative) Flow chart for checking the applicability of CISPR 12.52
Annex H (informative) Items under consideration .53
Bibliography.54
Figure 1 – Method of determination of conformance.12
Figure 2 – Limit of disturbance (peak and quasi-peak detector) at 10 m antenna
distance.13
Figure 3 – Limits of disturbance (average detector) at 10 m antenna distance .14
Figure 4 – Measuring site (OTS) for vehicles and devices.18
Figure 5 – Measuring site (OTS) for boats .19
Figure 6 – Antenna position to measure emissions – Vertical polarization.20
Figure 7 – Antenna position to measure emissions – Horizontal polarization.21
Figure B.1 – Determination of the maximum antenna angle.28
Figure B.2 – Calculation of the resulting gain reduction a.29
Figure C.1 – Alternate antenna factor determination (10 m antenna distance).34
Figure E.1 – Test circuit.38
Figure E.2 – General arrangement of the test box.38
Figure E.3 – Details of the test box lid .39
Figure E.4 – Details of the test box .39
Figure E.5 – Straight spark-plug ignition noise suppressor (screened or unscreened) .40
Figure E.6 – Right-angle spark-plug ignition noise suppressor (screened or
unscreened).40
Figure E.7 – Noise suppression spark-plug .40
Figure E.8 – Resistive distributor brush .40
Figure E.9 – Noise suppressor in distributor cap .41
Figure E.10 – Noise suppression distributor rotor.41
Figure E.11 – Noise suppression ignition cable (resistive or reactive) .41
Figure F.1 – Test set-up, side view .44
Figure F.2 – Test set-up, top view.45
Figure F.3 – Pressure chamber with ventilation.46
Figure F.4 – Top view of the set-up of a right-angle ignition noise suppressor for
distributors.47
Figure F.5 – Location of high voltage ignition components .48
Figure F.6 – Top view of the test set-up for distributor rotors .49
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– 4 – CISPR 12 © IEC:2007
Figure F.7 – Side view of the test set-up for ready-to-use resistive ignition cables .50
Table 1 – Spectrum analyser parameters.15
Table 2 – Scanning receiver parameters .15
Table 3 – Internal combustion engine operating speeds.23
Table A.1 – Statistical factors .26
Table A.2 – Example of frequency sub-bands .27
Table F.1 – Limits .42
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CISPR 12 © IEC:2007 – 5 –
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 OFF-BOARD RECEIVERS
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
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 12 has been prepared by CISPR subcommittee D:
Electromagnetic disturbances related to electric/electronic equipment on vehicles and internal
combustion powered devices.
This sixth edition cancels and replaces the fifth edition published in 2001 and its Amendment
1 (2005). This edition constitutes a technical revision.
The following changes were made with respect to the previous edition:
– deletion of narrowband / broadband determination
– general improvement of wording
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– 6 – CISPR 12 © IEC:2007
The text of this standard is based on the following documents:
Enquiry draft Report on voting
CISPR/D/322CDV CISPR/D/341/RVC
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 maintenance result 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.
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CISPR 12 © IEC:2007 – 7 –
INTRODUCTION
There is a specific need for standards to define acceptable radio frequency performance of all
electrical/electronic products. CISPR 12 has been developed to serve the road vehicle and
related industries with test methods and limits that provide satisfactory protection for radio
reception.
CISPR 12 has been used for many years as a regulatory requirement in numerous countries,
to provide protection for radio receivers in the residential environment. It has been extremely
effective in protecting the radio environment outside the vehicle.
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– 8 – CISPR 12 © IEC:2007
VEHICLES, BOATS AND INTERNAL COMBUSTION ENGINES –
RADIO DISTURBANCE CHARACTERISTICS –
LIMITS AND METHODS OF MEASUREMENT FOR THE PROTECTION
OF OFF-BOARD RECEIVERS
1 Scope
Residential Environment
The limits in this International Standard are
designed to provide protection for broadcast
receivers in the frequency range of 30 MHz
to 1 000 MHz when used in the residential
environment. Compliance with this standard
may not provide adequate protection for new
types of radio transmissions or receivers
used in the residential environment nearer
than 10 m to the vehicle, boat or device.
NOTE 1 Experience has shown that compliance with
this standard may provide satisfactory protection for
receivers of other types of transmissions when used in
the residential environment, including radio
transmissions in frequency ranges other than that
specified.
This standard applies to the emission of electromagnetic energy which may cause
interference to radio reception and which is emitted from
a) vehicles propelled by an internal combustion engine, electrical means or both (see 3.1);
b) boats propelled by an internal combustion engine, electrical means or both (see 3.2).
Boats are to be tested in the same manner as vehicles except where they have unique
characteristics as explicitly stated in this standard;
c) devices equipped with internal combustion engines (see 3.3).
See Annex G for a flow chart to help determine the applicability of CISPR 12.
This standard does not apply to aircraft, traction systems (railway, tramway and electric trolley
bus), or to incomplete vehicles. In the case of a dual-mode trolley bus (e.g. propelled by
power from either a.c./d.c. mains or an internal combustion engine), the internal combustion
propulsion system must be included, but the a.c./d.c. mains portion of the vehicle propulsion
system is excluded from this standard.
NOTE 2 Protection of receivers used on board the same vehicle as the disturbance source(s) are covered by
CISPR 25.
The measurement of electromagnetic disturbances while the vehicle is connected to power
mains for charging is not covered in this standard. The user is referred to appropriate IEC and
CISPR standards which define measurement techniques and limits for this condition.
Annex H lists work being considered for future revisions.
---------------------- Page: 13 ----------------------
CISPR 12 © IEC:2007 – 9 –
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 60050-161, International Electrotechnical Vocabulary (IEV) – Chapter 161: Electro-
magnetic compatibility
CISPR 16-1-1:2006, Specification for radio disturbance and immunity measuring apparatus
and methods – Part 1-1: Radio disturbance and immunity measuring apparatus – Measuring
apparatus
CISPR 16-1-3:2004, Specification for radio disturbance and immunity measuring apparatus
and methods – Part 1-3: Radio disturbance and immunity measuring apparatus – Ancillary
equipment – Disturbance power
CISPR 16-1-4:2007, Specification for radio disturbance and immunity measuring apparatus
and methods – Part 1-4: Radio disturbance and immunity measuring apparatus – Ancillary
equipment – Radiated disturbances
CISPR 16-2-3:2006, Specification for radio disturbance and immunity measuring apparatus
and methods – Part 2-3: Methods of measurement of disturbances and immunity – Radiated
disturbance measurements
CISPR 25, Radio disturbance characteristics for the protection of receivers used on board
vehicles, boats, and on devices – Limits and methods of measurement
3 Terms and definitions
For the purpose of this document, the terms and definitions contained in IEC 60050-161 as
well as the following apply.
3.1
vehicle
machine operating on land which is intended to carry persons or goods
NOTE Vehicles include, but are not limited to, cars, trucks, buses, mopeds, agricultural machinery, earth-moving
machinery, material-handling equipment, mining equipment and snowmobiles.
3.2
boat
vessel intended to be used on the surface of water, its length being no greater than 15 m
3.3
device
machine driven by an internal combustion engine which is not primarily intended to carry
persons or goods
NOTE Devices include, but are not limited to, chainsaws, irrigation pumps, snow blowers, air compressors, and
landscaping equipment
3.4
impulsive ignition noise
unwanted emission of electromagnetic energy, predominantly impulsive in content, arising
from the ignition system within a vehicle, boat or device
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– 10 – CISPR 12 © IEC:2007
3.5
ignition noise suppressor
that portion of a high-voltage ignition circuit intended to limit the emission of impulsive ignition
noise
3.6
outdoor test site (OTS)
measurement site similar to an open area test site as specified in CISPR 16, however a
ground plane is not required and there are dimensional changes
NOTE Specific requirements are defined in this document.
3.7
resistive distributor brush
resistive pick-up brush in an ignition distributor cap
3.8
frequency sub-band
segment of the frequency spectrum (30 MHz to 1 000 MHz) defined to enable statistical
evaluation of the test data acquired by swept frequency testing
3.9
representative frequency
assigned frequency of a frequency sub-band to be used for comparison of the data to the limit
3.10
characteristic level
controlling (or dominant) emission level experienced in each frequency sub
...
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