Bsi bs en 50065 2 1 2003 (2006)

BRITISH STANDARD

BS EN
50065-2-1:2003
Incorporating
Corrigendum No. 1
and Amendment No. 1

Signalling on
low-voltage electrical
installations in the
frequency range
3 kHz to 148,5 kHz —
Part 2-1: Immunity requirements for
mains communications equipment and
systems operating in the range of
frequencies 95 kHz to 148,5 kHz and
intended for use in residential,
commercial and light industrial
environments

The European Standard EN 50065-2-1:2003, with the incorporation of
amendment A1:2005, has the status of a British Standard

ICS 33.040.30

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BS EN 50065-2-1:2003

National foreword
This British Standard is the official English language version of
EN 50065-2-1:2003, including Corrigendum August 2003 and amendment
A1:2005.
The start and finish of text introduced or altered by CENELEC amendment is
indicated in the text by tags !". Tags indicating changes to CENELEC text
carry the number of the CENELEC amendment. For example, text altered by
CENELEC amendment A1 is indicated in the text by !".
The UK participation in its preparation was entrusted to Technical Committee
PEL/205, Mains signalling, which has the responsibility to:
—

aid enquirers to understand the text;

—

present to the responsible international/European committee any
enquiries on the interpretation, or proposals for change, and keep
UK interests informed;

—

monitor related international and European developments and
promulgate them in the UK.

A list of organizations represented on this committee can be obtained on
request to its secretary.
Cross-references
The British Standards which implement international or European
publications referred to in this document may be found in the BSI Catalogue

under the section entitled “International Standards Correspondence Index”, or
by using the “Search” facility of the BSI Electronic Catalogue or of British
Standards Online.
This publication does not purport to include all the necessary provisions of a
contract. Users are responsible for its correct application.
Compliance with a British Standard does not of itself confer immunity
from legal obligations.

Summary of pages
This document comprises a front cover, an inside front cover, the EN title page,
pages 2 to 15 and a back cover.
The BSI copyright date displayed in this document indicates when the
document was last issued.

This British Standard was
published under the authority
of the Standards Policy and
Strategy Committee
on 11 April 2003
© BSI 7 March 2006

Amendments issued since publication
Amd. No.

Date

Comments

14800

25 November 2003

Correction to Table 2, item b)
Units column

16002

March 2006

See national foreword

Corrigendum No. 1

ISBN 0 580 41580 5


EN 50065-2-1

EUROPEAN STANDARD

January 2003

NORME EUROPÉENNE

+A1

EUROPÄISCHE NORM

September 2005

ICS 33.040.30

Incorporating corrigendum August 2003

English version

Signalling on low-voltage electrical installations
in the frequency range 3 kHz to 148,5 kHz
Part 2-1: Immunity requirements for mains communications equipment
and systems operating in the range of frequencies 95 kHz to 148,5 kHz
and intended for use in residential, commercial
and light industrial environments
(includes amendment A1:2005)

Transmission de signaux sur les réseaux
électriques basse tension dans la bande
de fréquences de 3 kHz à 148,5 kHz
Partie 2-1: Exigences d'immunité
pour les appareils et les systèmes
de communication sur le réseau électrique
dans la bande de fréquences de 95 kHz à
148,5 kHz et destinés
à être utilisés dans les environnements
résidentiel, commercial et de l'industrie
légère

Signalübertragung auf elektrischen
Niederspannungsnetzen
im Frequenzbereich 3 kHz bis 148,5 kHz
Teil 2-1 : Störfestigkeitsanforderungen

an Netz-Datenübertragungsgeräte
und -systeme, die im Frequenzbereich
95 kHz bis 148,5 kHz betrieben werden
und für den Gebrauch in Wohnbereichen,
Geschäfts- und Gewerbebereichen
sowie in Kleinbetrieben bestimmt sind
(enthält Änderung A1:2005)

(inclut l’amendement A1:2005)
This European Standard was approved by CENELEC on 2001-12-04; amendment A1:2005 was approved
by CENELEC on 2006-07-01. 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, Czech Republic,
Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta,
Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and 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
© 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50065-2-1:2003 + A1:2005 E

EN 50065-2-1:2003

–2–

Foreword
This European Standard was prepared by SC 205A, Mains communicating systems, of Technical Committee
CENELEC TC 205, Home and Building Electronic Systems (HBES).
The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC
as EN 50065-2-1 on 2001-12-04.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement

(dop)

– latest date by which the national standards conflicting
with the EN have to be withdrawn

(dow) 2004-10- 01

2003-10-01

This part of this standard defines limits and test methods for the immunity of mains communication
equipment and systems (MCES) operating in the range of frequencies from 95 kHz to 148,5 kHz
and intended for use in residential, commercial and light industrial environments. Immunity
requirements for similar equipment intended for operation in industrial environments are given in
Part 2-2 of this standard. Immunity requirements and tests applicable to Electricity Suppliers'
equipment and systems operating in the band 3 kHz to 95 kHz are given in Part 2-3.

These tests and limits represent essential electromagnetic compatibility and immunity requirements.
Correspondingly not all known disturbances have been included for testing purposes which have
been limited to those disturbances known to be critical for the operation of such equipment including
specific MCES disturbances such as conducted narrow band.
The immunity requirements have been selected to ensure an adequate level of immunity for MCES
in residential, commercial and light industrial environments. The levels do not however cover
extreme cases which may occur in any location but with an extremely low probability of occurrence.
NOTE This standard closely follows EN 50082-1, the Generic Immunity Standard for the residential, commercial and light
industrial environment, from which much of the material is taken. However the nature of MCES is such that the
performance criteria given in clause 5 of this standard differ from those given in EN 50082-1, particularly regarding the
recovery of equipment following a disturbance. For clarity and completeness all the affected sections of EN 50082-1 are
therefore repeated in this part.

Annexes designated "normative" are part of the body of the standard.
In this standard, annex A is normative.

Foreword to amendment A1
This amendment to the European Standard EN 50065-2-1:2003 was prepared by SC 205A, Mains
communicating systems, of Technical Committee CENELEC TC 205, Home and Building Electronic
Systems (HBES).
The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC
as amendment A1 to EN 50065-2-1:2003 on 2005-07-01.
The following dates were fixed:
– latest date by which the amendment has to be implemented
at national level by publication of an identical
national standard or by endorsement

(dop)

– latest date by which the national standards conflicting

with the EN have to be withdrawn

(dow) 2008-07- 01

2006-07-01


–3–

EN 50065-2-1:2003

Contents
Page
1

Scope...............................................................................................................................

4

2

Normative references .......................................................................................................

4

3

Definitions ........................................................................................................................

5

4

Description of locations ....................................................................................................

6

5

Performance criteria.........................................................................................................

6

6

Conditions during testing..................................................................................................

7

7

Immunity specifications ....................................................................................................

7

7.1

Applicability of immunity test requirements.......................................................................

7

7.2

Test specifications ...........................................................................................................

7

7.2.1

Immunity requirements ................................................................................................

7

7.2.2

Narrow-band conducted interference...........................................................................

12

Annex A (normative) Test circuit ...............................................................................................

14

A.1

Test circuit specification ...................................................................................................

14

A.2

Method of testing .............................................................................................................

15

Figure 1 - Examples of ports......................................................................................................

6

Figure 2 - Signal source and coupling network for narrow-band conducted interference test ....

12

Figure A.1 - Test circuit .............................................................................................................

14

Table 1 - Immunity: Enclosure port ............................................................................................

9

Table 2 - Immunity: Ports for signal and control lines.................................................................

9

Table 3 - Immunity: d.c. input and d.c. output power ports .........................................................

10

Table 4 - Immunity: a.c. input and a.c. output power ports .........................................................

11

Table 5 - Input a.c. power ports .................................................................................................

13


EN 50065-2-1:2003

1

–4–

Scope

This standard applies to electrical equipment using signals in the frequency range 95 kHz to
148,5 kHz to transmit or receive information on low voltage electrical systems, residential,
commercial and light industrial environments. In the case of equipment which includes functions
other than the transmission or reception of information on low voltage electrical supplies, this
standard applies only to that part of the equipment intended for such transmission or reception of
information. Other parts of the equipment shall comply with the immunity standard or standards
relevant to the functions of those other parts. In the event of tests being specified in those other
standards of a different severity and where the construction of the equipment is such that the
functions cannot be tested separately, the higher severity shall apply to all affected functions.
The object of this standard is to limit mutual influence between mains communication equipment
and systems (MCES) operating in different frequency bands as defined in EN 50065-1 and to
contribute to ensuring Electromagnetic Compatibility in general. It specifies essential immunity
requirements and test methods, including those tests which are to be performed during type-testing
of MCES on low-voltage installations, for electromagnetic interference in general and more specific

interference coming from other MCES. It therefore defines the immunity test requirements for
apparatus in relation to continuous and transient disturbances, both conducted and radiated, and
electrostatic discharges. Test requirements are specified for each port considered.
This standard gives limits which are applicable to products operating in residential, commercial and
light industrial environments. The levels do not however cover extreme cases which may occur in
any location but with a low probability of occurrence. In special cases situations will arise where the
level of disturbances may exceed the levels specified in this standard e.g. where a hand-held
transmitter is used in proximity to an apparatus. In these instances special mitigation measures may
have to be employed.
It does not specify immunity between mains communication systems operating in the same band (as
defined in EN 50065-1) or immunity to signals originating from Power Line Carrier systems
operating on high or medium voltage networks.
Safety considerations are not included in this standard.

2

Normative references

This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of
any of these publications apply to this European Standard only when incorporated in it by
amendment or revision. For undated references the latest edition of the publication referred to
applies (including amendments).
 EN 50065-1

Signalling on low voltage electrical installations in the frequency
range 3 kHz to 148,5 kHz – Part 1: General requirements,
frequency bands and electromagnetic disturbances

EN 61000-6-1

Electromagnetic compatibility – Generic immunity standard
Part 1: Residential, commercial and light industry

EN 55022

EN 61000-3-2

1998

Information technology equipment – Radio disturbance
characteristics - Limits and methods of measurement
(CISPR 22:1997, mod.)
Electromagnetic compatibility (EMC) – Part 3-2: Limits - Limits
for harmonic current emissions (equipment input current up to
and including 16 A per phase) (IEC 61000-3-2)


–5–

EN 50065-2-1:2003

EN 61000-4-2

Electromagnetic compatibility (EMC) – Part 4-2: Testing and
measurement techniques – Electrostatic discharge immunity test
(IEC 61000-4-2)

EN 61000-4-3

Electromagnetic compatibility (EMC) – Part 4-3: Testing and
measurement techniques – Radiated, radio-frequency,
electromagnetic field immunity test
(IEC 61000-4-3, mod.)

EN 61000-4-4

Electromagnetic compatibility (EMC) – Part 4-4: Testing and
measurement techniques – Electrical fast transient/burst
immunity test (IEC 61000-4-4)

EN 61000-4-5

Electromagnetic compatibility (EMC) – Part 4-5: Testing and
measurement techniques – Surge immunity test (IEC 61000-4-5)

EN 61000-4-6

Electromagnetic compatibility (EMC) – Part 4-6: Testing and
measurement techniques – Immunity to conducted disturbances,
induced by radio-frequency fields
(IEC 61000-4-6)

EN 61000-4-8

Electromagnetic compatibility (EMC) – Part 4-8: Testing and
measurement techniques – Power frequency magnetic field
immunity test (IEC 61000-4-8)

EN 61000-411

Electromagnetic compatibility (EMC) – Part 4-11: Testing and
measurement techniques – Voltage dips, short interruptions and
voltage variations immunity tests (IEC 61000-4-11)

CISPR 16-1

Text
deleted

IEC 60050-161

3

Specification for radio disturbance and immunity measuring
apparatus and methods – Part 1: Radio disturbance and
immunity measuring apparatus
International Electrotechnical Vocabulary – Chapter 161:
Electromagnetic compatibility

Definitions

For the purpose of this standard, the following definitions together with those in IEC 60050-161
apply.
3.1
electromagnetic interference
See definition given in IEC 60050-161.
3.2
immunity

the ability of MCES to perform within specified limits in the presence of an electromagnetic
disturbance
NOTE 1 Influences between MCES operating in the same frequency band (see EN 50065-1) are not taken into account.
NOTE 2 See IEC 60050 Chapter 161 for a more general definition.

3.3
immunity level
the maximum level of a given electromagnetic disturbance incident on the equipment for which it
remains capable of operating at a specified degree of performance
(Definition given in IEV 60050-161)


EN 50065-2-1:2003

–6–

3.4
port
particular interface of the specified accessory with the external electromagnetic environment (see
Figure 1)
3.5
cable port
a point at which a conductor or a cable is connected to the accessory. Examples are signal, control
and power ports
3.6
enclosure port
the physical boundary of the accessory through which electromagnetic fields may radiate or impinge
Text deleted
3.8
severity level

value of an influencing electromagnetic quantity specified for an immunity test
Enclosure port
AC power port

Signal/control port

APPARATUS
DC power port

Earth port
Figure 1 - Examples of ports

4

Description of locations

The environments encompassed by this standard are residential, commercial and light-industrial
locations, both indoor and outdoor. The following list, although not comprehensive, gives an
indication of locations which are included:
x residential properties, e.g. houses, apartments,
x retail outlets, e.g. shops, supermarkets,
x business premises, e.g. offices, banks,
x areas of public entertainment, e.g. cinemas, public bars, dance halls,
x outdoor locations, e.g. petrol stations, car parks, amusement and sports centres,
x light-industrial locations, e.g. workshops, laboratories, service centres.
Locations which are characterised by being supplied directly at low voltage from the public mains
network are considered to be residential, commercial or light industrial.

5

Performance criteria

For the purposes of the tables the performance criteria are:
A : the MCES continues to operate as intended (e.g. transmission, reception) within the
performance limits specified by the manufacturer. No change of actual operating state or stored
data is allowed.
B : a temporary degradation or loss of function or performance is permitted during the disturbance
provided the equipment automatically resumes normal operation following the removal of the


–7–

EN 50065-2-1:2003

disturbance. The time behaviour for this resumption of normal operation shall be as specified in
the MCES manufacturer's specification. No change of actual operating state or stored data is
allowed.
C : a temporary degradation or loss of function or performance is permitted during the disturbance
and which requires manual intervention or system reset before normal operation is resumed
following removal of the disturbance. No change of stored data is allowed.
NOTE 1 The electrical mains are a hostile communications environment and many MCES operate using sophisticated
protocol services which permit the recovery of data corrupted by interference or cause re-transmission of data in the event
of corruption. Errors caused by the application of the tests in this standard and which are subsequently corrected by the
protocol services are regarded as normal and the equipment is regarded as operating as intended in such circumstances.
NOTE 2 Changes in stored data referring only to the internal operation of the equipment under test, such as
communication error logs, and which are not directly related to the intended function of the equipment should be ignored.

6

Conditions during testing

The tests shall be made in the most susceptible operating mode in the frequency band being
investigated consistent with normal application. The configuration of the test sample shall be varied
to achieve maximum susceptibility. If the apparatus is part of a system or can be connected to
auxiliary apparatus, then the apparatus shall be tested while connected to the minimum
configuration of auxiliary apparatus necessary to exercise the ports in accordance with EN 55022.
The configuration and mode of operation during the tests shall be precisely noted in the test report.
If the apparatus has a large number of terminals then a sufficient number shall be selected to
simulate actual operating conditions and to ensure that all the different types of terminations are
covered. The test shall be carried out within the specified operating environmental range for the
apparatus and at its rated supply voltage, unless otherwise indicated in the basic standard.
Performance criteria A and B require that the functions of transmission and communication are
verified during the application of the disturbance or immediately thereafter. The test circuit used to
conduct immunity tests on such equipment shall be that in Annex A.

7

Immunity specifications

7.1

Applicability of immunity test requirements

The immunity test requirements for products covered by this standard are given in Table 1 to
Table 5, inclusive, on a port by port basis. Tests are applied to all relevant ports of the apparatus
according to the tables where the relevant ports exist and are accessible during normal operation of
the equipment.
Tests shall be conducted in a well-defined and reproducible manner and shall be carried out as
single tests in sequence. The sequence of testing is optional.
The content of these basic standards are not repeated here; however modifications or additional

information needed for the practical application of the tests to MCES are given in this standard.
7.2

Test specifications

7.2.1

Immunity requirements

Severity levels and performance criteria are given in Table 1 to Table 5 and in addition in Table 6
of 7.2.2.
Testing shall be carried out according to the standards referenced in the tables and, in
the case of tests requiring performance criteria A or B, in accordance with the requirements of
Annex A.


Environmental
phenomenon

Test
specification

Units

Basic
standard

Remarks

Performance

criterion

a)

Radio-frequency
electromagnetic field.
Amplitude modulated.

80 to 1000
3
80

MHz
V/m
% AM (1 kHz)

EN 61000-4-3

The test level specified is prior to
modulation.

A

b)

Radio-frequency
Electromagnetic field
Pulse modulated

900 r 5

3
50
200

MHz
V/m
Duty cycle %
Rep. frequency Hz

EN 61000-4-3

The test level specified is prior to
modulation.

A

c)

Power-frequency
magnetic field

50
3

Hz
A/m

EN 61000-4-8

See notes 1 & 2.

A
CRT display
interference allowed
above 1A/m

d)

Electrostatic
Discharge

±4 Contact
discharge

kV (charge voltage)

EN 61000-4-2

See basic standard for
applicability of contact and/or air
discharge test.

B

B

kV (charge voltage)

–8–

±8 Air discharge
NOTE 1 Applicable only to apparatus containing devices susceptible to magnetic fields, e.g. Hall elements, electrodynamic microphones, etc.
NOTE 2 For CRTs the acceptable jitter depends upon the character size and is computed for a test level of 1 A/m: Jitter (mm) = (3.x character size (mm)+ 1)/40. As
jitter is linearly proportional to the magnetic field strength tests can be carried out at other test levels extrapolating the maximum jitter level appropriately.

Table 2 - Immunity: Ports for signal and control lines*
Environmental
phenomenon

Test
specification

Units

EN 50065-2-1:2003

Table 1 - Immunity: Enclosure port

Basic
standard

Remarks

Performance
criterion

a)

Radio-frequency
common mode.

Amplitude modulated.

0,15 to 80
3
80

MHz
V
% AM (1 kHz)

EN 61000-4-6

See notes 1 & 2.
The test level specified is prior to
modulation.

A

b)

Fast transients

±0,5
5/50
5

kV (peak)
Tr/Th ns
Rep. frequency kHz

EN 61000-4-4

See note 2.

B

NOTE 1 The test level can be defined as the equivalent current into a 150 : load.
NOTE 2 Applicable only to ports interfacing with cable whose total length may exceed 3 m according to the manufacturers functional specification.
* in the case of the signal port and the AC power port being different; otherwise see Table 4. This is only applicable to low-level signal ports and not to signal ports
directly connected to the mains.


Table 3 - Immunity: d.c. input and d.c. output power ports
Environmental
phenomenon

Test
specification

Units

Basic
standard

Remarks

Performance
criterion

a)

Radio-frequency
common mode.
Amplitude modulated.

0,15 to 80
3
80

MHz
V
% AM (1 kHz)

EN 61000-4-6

See notes 1 & 2.
The test level specified is prior to
modulation.

A

b)

Surges
Common mode
Differential mode

1,2/50 (8/20)
±0,5
±0,5

Tr/Tn Ps
kV (peak)
kV (peak)

EN 61000-4-5

See note 2.

B

c)

Fast transients
Common mode

±0,5
5/50
5

kV (peak)
Tr/Th ns
Rep. frequency kHz

EN 61000-4-4

See note 2.

B

NOTE 1 The test level can be defined as the equivalent current into a 150 : load.
NOTE 2 Not applicable to input ports intended for connection to a battery or a rechargeable battery which must be removed or disconnected from the apparatus for
recharging. Apparatus with a d.c. power supply input port intended for use with an a.c.-d.c. power adapter shall be tested on the a.c. power input of a typical a.c.-d.c.
power adapter. The test is applicable to d.c. power input ports intended to be connected permanently to installations greater than 10 m.

–9–
EN 50065-2-1:2003


Environmental
phenomenon

Test
specification

Units

Basic
standard

Remarks

Performance
criterion

a)

Radio-frequency
common mode.
Amplitude modulated.

0,15 to 80
3
80

MHz
V
% AM (1 kHz)

EN 61000-4-6

See note 1.
The test level specified is prior to
modulation.

A

b)

Voltage dips

30
10

% reduction
ms

EN 61000-4-11

Voltage shift at zero crossing.

B

60
5

% reduction
duration in periods

See note 2.

C

c)

Voltage
interruptions

> 95 %
5

% reduction
s

EN 61000-4-11

Voltage shift at zero crossing.
See note 2.

C

d)

Surges
Common mode
Differential mode

1,2/50 (8/20)
± 2
± 1

Tr/Tn Ps
kV (peak)
kV (peak)

EN 61000-4-5

See note 2.

B

e)

Fast transients

±1
5/50
5

kV (peak)

Tr/Th ns
Rep. frequency kHz

EN 61000-4-4

NOTE 2 Applicable only to input ports.

B

– 10 –

NOTE 1 The test level can be defined as the equivalent current into a 150 : load.

EN 50065-2-1:2003

Table 4 - Immunity: a.c. input and a.c. output power ports


Table 5 - Immunity: Earth port (functional ground terminal)
Environmental
phenomenon

Test
specification

Units

Basic
standard

Remarks

Performance
criterion

a)

Radio-frequency
common mode.
Amplitude modulated.

0,15 to 80
3
80

MHz
V
% AM (1 kHz)

EN 61000-4-6

See NOTE 1.
The test level specified is prior to
modulation.

A

b)

Fast transients

± 0,5
5.50
5

KV (peak)
Tr/Th ns
Rep. frequency kHz

EN 61000-4-4

See NOTE 2.
Use of the capacitive clamp.

B

NOTE 1 The test level can be defined as the equivalent current into a 150 : load.
''NOTE 2 Applicable only to ports interfacing with cable whose total length may exceed 3 m according to the manufacturer ' s functional specification.

– 11 –
EN 50065-2-1:2003


EN 50065-2-1:2003

7.2.2

– 12 –

Narrow-band conducted interference

The purpose of this test is to verify the immunity of the MCES from narrow band conducted
interference caused either by MCES operating in different frequency bands as defined in
EN 50065-1 or by out-of-band disturbances at frequencies above 148,5 kHz.
The test is made at spot frequencies in the band from 3 kHz to 30 MHz, excluding the band (or subbands) listed in 4.1 and 4.2 of EN 50065-1 in which the signalling equipment operates.
The interference source and coupling network is shown in Figure 2. The signal source shall produce
a signal, at each frequency used for each test, which is amplitude modulated with 1 000 Hz at 80%
depth. At each frequency the output of the coupling circuit shall be connected to a suitable
measuring instrument and the amplifier adjusted such that the strength of the unmodulated signal is
at the level specified in Table 5. The signal purity shall be such that harmonics and sub-harmonics
of the test signal which fall in the frequency band used by the EUT are no greater than 80 dBPV in
magnitude.
NOTE 1 Due to the modulation method, the peak envelope value is about 5 dB above the values shown on the table,
which correspond to the maximum true transmitter output levels according to EN 50065-1. These values are considered to
be sufficient since the impedance of the supply system is much less than that of the V-network.
NOTE 2 The breadth of the frequency range used for this test may require that more than one amplifier / transformer
combination is required, each combination being used for a part of the frequency range in question.

 The coupling network is then disconnected from the measurement network and connected to Port
A as shown in Annex A such that the disburbing signal is applied to the EUT.
It shall be verified
that the EUT continues to function in accordance with the performance criteria given in Table 5.
NOTE 3 It may be necessary to take measures to protect the amplifier from the effects of direct connection to Port A.
These may include removing the power supply from the test network before connecting the interference source and coupling
network and by a slow increase in applied mains voltage thereafter.

Wide-band
Amplifier
Signal
Source

2PF capacitor
50:
resistor

~
1:1 ratio
transformer

Figure 2 - Signal source and coupling network
for narrow-band conducted interference test


– 13 –

 Table 6
Frequency range

a b

EN 50065-2-1:2003

- Input a.c. power ports
Level dB (µV)

Criterion

134 (note 1)

A

10 to 94 kHz

134 to 120 (notes 1 and 2)

A

96 to 124 kHz

122

B

126 to 139 kHz

122

B

141 to 147,5 kHz

122

B

0,150 to 30 MHz

66

A

3 to 8 kHz

NOTE 1 For equipment intended to operate in the band 125 kHz to 140 kHz only, spurious harmonics in the
signal source, or created by non-linearities in the test circuit, may cause a false “band-in-use” indication thus
preventing the transmitter from operating. In this case, criterion B shall be applied and the test then repeated
using signals 20 dB(PV) below those shown in the table and with criterion A applied.
NOTE 2 The value decreases linearly from 134 dB(µV) to 120 dB(µV), with the logarithm of the frequency.
a

The frequency bands listed are not continuous but are separated from each other by at least 2 kHz. This is to
ensure that the test signal, including its sidebands, is wholly contained in the corresponding bands given in
EN 50065-1.
b

The signals used for the purpose of this test may not always be representative of the signals encountered in
practise. It may therefore happen that systems operating in different frequency bands as well as, more generally,
systems operating in the same frequency band, may disturb each other and appropriate measures (e.g. the use of
filters) may be necessary. In this case appropriate information shall be included in the operating instructions
supplied with the equipment.


EN 50065-2-1:2003

– 14 –

Annex A
(normative)
Test circuit
A.1 Test circuit specification

The test circuit or general measuring set-up used for any test having performance criteria A or B is
that shown in Figure A.1. It is recommended that this arrangement is also used for tests having
performance criterion C.
Text deleted
NOTE The figure shows the case of testing for frequencies from 9 kHz upwards.

Port B

Mains

Additional
filter
section

Supply

Artificial network A to
CISPR 16-1

50 :
Termination

Additional
filter
section

Stimulus

660
µH

choke

660
µH
choke

Artificial network B to
CISPR 16-1

EUT

50 :
Termination
Port A
NOTE
The filter section provides mutual isolation between the two artificial networks and prevents unwanted signal
transmissions, via the mains supply.

Figure A.1 - Test circuit
 Port A is used for the tests a), d) and e) in Table 4 and tests a), b) in Table 5.
The tests of Table 1 to Table 3, inclusive, are carried out on the ports on the equipment under test
specified in those tables.

A.2 Method of testing
Where the equipment under test is capable of both receiving and transmitting signals and its correct
operation is verified by transmission of an acknowledgement, or similar signal, the equipment shall
be tested in the receiving mode only, the reception of an acknowledgement being considered
evidence of its ability to transmit. Equipment which is capable of operating either only as a
transmitter or only as a receiver shall be tested in that mode and correct operation shall be verified
by observation of status indicators (if any) and the state of any input or output ports.

– 15 –

EN 50065-2-1:2003

Where performance criterion A or B applies the equipment under test shall be observed during
testing to ensure that there is no change in the status of any inputs or outputs and any externally
observable data shall be examined before and after testing to ensure that there has been no change
in this data. Externally observable data means, in this context, data which may be displayed on the
EUT (for example on an LCD or LED screen), and any data which may be read electronically either
by means of a data port on the EUT or by communication over the network. Changes in data
relating only to the internal operation of the equipment under test, such as communication error
logs, and which are not directly related to the intended function of the equipment shall be ignored.


BS EN
50065-2-1:2003

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