Bsi bs en 50065 2 3 2003 (2006)

BRITISH STANDARD

BS EN
50065-2-3:2003
Incorporating
Amendment No. 1 and
Corrigendum No. 1

Signalling on
low-voltage electrical
installations in the
frequency range
3 kHz to 148,5 kHz —
Part 2-3: Immunity requirements for
mains communications equipment and
systems operating in the range of
frequencies 3 kHz to 95 kHz and
intended for use by electricity suppliers
and distributors

The European Standard EN 50065-2-3:2003, with the incorporation of
amendment A1:2005, has the status of a British Standard

ICS 33.040.30; 33.100.01

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BS EN 50065-2-3:2003

National foreword

This British Standard is the official English language version of
EN 50065-2-3:2003, 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 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 the
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 18, an inside back cover 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 24 January 2003

Amendments issued since publication

© BSI 15 March 2006

ISBN 0 580 41140 0

Amd. No.

Date

Comments

Corrigendum No. 1

14799

28 November 2003 Corrections to Table 2a and Table 2b,
item c) Units column and shoulder heads
on pages 10 and 12

16003

15 March 2006

See national foreword


EN 50065-2-3

EUROPEAN STANDARD

January 2003

NORME EUROPÉENNE

+ A1

EUROPÄISCHE NORM

September 2005

ICS 33.040.30; 33.100.01

Incorporating corrigendum August 2003

English version

Signalling on low-voltage electrical installations
in the frequency range 3 kHz to 148,5 kHz
Part 2-3: Immunity requirements for mains communications equipment
and systems operating in the range of frequencies 3 kHz to 95 kHz
and intended for use by electricity suppliers and distributors
(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 3 kHz à 95
kHz et destinés à être utilisés par
les fournisseurs et les distributeurs
d'énergie électrique
(inclut l’amendement A1:2005)

Signalübertragung auf elektrischen
Niederspannungsnetzen im
Frequenzbereich 3 kHz bis 148,5 kHz
Teil 2-3: Störfestigkeitsanforderungen
an Netz-Datenübertragungsgeräte und systeme die im Frequenzbereich 3 kHz
bis 95 kHz betrieben werden und für den

Gebrauch durch Stromversorgungs- und
-verteilungsunternehmen bestimmt sind
(enthält Änderung A1:2005)

This European Standard was approved by CENELEC on 2001-09-01; amendment A1 was approved by
CENELEC on 2005-07-01. 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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, 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 50065-2-3:2003 + A1:2005 E


EN 50065-2-3:2003

–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 50065-2-3 on 2001-09-01.
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) 2004-08-01

2003-08-01

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
3 kHz to 95 kHz and intended for use by electricity suppliers and distributors. Immunity
requirements for similar equipment intended for operation in residential, commercial and light
industrial environments are given in Part 2-1 of this standard. Immunity requirements and tests
applicable to similar equipment intended for operation in industrial environments are given in
Part 2-2 of this standard. For MCES intended to be operated by utilities in the frequency range
3 kHz to 95 kHz, with lower immunity requirements than specified in this Part 2-3, the
specifications of Part 2-2 or Part 2-1 may be applied.
These tests and limits represent essential electromagnetic compatibility and immunity
requirements for the environment according to the scope. 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 for use by electricity utilities. 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 takes into account EN 50082-2, the generic immunity standard for the industrial environment,
from which much of the material is taken, but considering also the specific requirements for MCES in utilities’
environment. However the nature of MCES is such that the performance criteria given in clause 5 of this standard differ
from those given in EN 50082-2, particularly regarding the recovery of equipment following a disturbance. For clarity and
completeness all the affected sections of EN 50082-2 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 50065-2-3:2003 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 50065-2-3:2003 on 2005-07-01.


–3–

EN 50065-2-3:2003

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)

2006-07-01

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

(dow)

2008-07-01

__________


EN 50065-2-3:2003

–4–

Contents
Page
Foreword

2

1

Scope

5

2

Normative references

5

3

Definitions

6

4

Description of locations

7

5

Performance criteria

7

6

Conditions during testing

8

7

Immunity specifications

8

7.1

Applicability of immunity test requirements

8

7.2

Test specifications

9

7.2.1

Immunity requirements

9

7.2.2

Narrow-band conducted interference

Annex A (normative) Test circuit used for immunity tests

15
17

A.1

Test circuit specification .................................................................................................. 17

A.2

Method of testing ............................................................................................................ 18

Figure 1 – Examples of ports ....................................................................................................... 7
Figure 2 – Signal source and coupling network for narrow-band conducted
interference test........................................................................................................................ 15
Table 1 – Immunity: Enclosure port ........................................................................................... 10
Table 2a – Immunity: Ports for signal and control lines ............................................................. 11
Table 2b – Immunity: Ports for process, measurement and long bus and control lines .............. 11
Table 3 – Immunity: d.c. input and d.c. output power ports ........................................................ 12
Table 4 – Immunity: a.c. input and a.c. output power ports ....................................................... 13
Table 5 – Immunity: Earth port (functional ground terminal) ...................................................... 14
Table 6 – Input a.c. power ports ................................................................................................ 16


–5–

1

EN 50065-2-3:2003

Scope

This standard applies to electrical equipment using signals in the frequency range 3 kHz to
95 kHz to transmit or receive information on low voltage electrical systems, for electricity
suppliers and distributors. 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 typetesting 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 the public supply
network, operated by electricity utilities. 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 50082-2

Electromagnetic compatibility – Generic immunity standard –
Part 2: Industrial environment

EN 55022

1998

Information technology equipment – Radio disturbance
characteristics – Limits and methods of measurement
(CISPR 22:1997, mod)


EN 50065-2-3:2003

–6–

EN 61000-3-2

Electromagnetic compatibility (EMC) – Part 3-2: Limits – Limits
for harmonic currents emissions (equipment input current up to
and including 16 A per phase) (IEC 61000-3-2)

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 61000-4-11

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

IEC 60050-161

3

Text
deleted

Specification for radio disturbance and immunity measuring
apparatus methods – Part 1: Radio disturbance and 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 60050-161-01-06
3.2
immunity
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 60050-161 for a more general definition.


–7–

EN 50065-2-3:2003

3.3
immunity level
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 IEC 60050-161-03-14)
3.4
port
particular interface of the specified accessory with the external electromagnetic environment
(see Figure 1)
3.5
cable port
point at which a conductor or a cable is connected to the accessory. Examples are signal, control
and power ports
3.6

enclosure port
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 any locations in the public supply low
voltage (LV) network both indoor and outdoor. Apparatus covered by this standard is not
intended to be connected to a power network supplied from a high or medium-voltage
transformer dedicated to the supply of an installation feeding manufacturing or similar plant. This
standard applies to apparatus intended to operate in any location where electricity utilities’
MCES are operated. Thus it applies to equipment installed at the boundary of a property, e.g. at
the metering point, and equipment installed at the LV side of a distribution transformer, and any
connected point between.

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;


EN 50065-2-3:2003

–8–

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 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.
NOTE 3 Criterion C is not used in this part and is retained only for compatibility with other parts of this standard.

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 criterion 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 (normative).

7
7.1

Immunity specifications
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.
It may be determined from consideration of the electrical characteristics and usage of a particular
product that some of the tests are inappropriate and therefore unnecessary. In such a case the
decision not to test shall be recorded in the test report.


–9–

EN 50065-2-3:2003

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
7.2.1

Test specifications

Immunity requirements

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


Environmental
phenomenon

Test
specification

Units

Basic
standard

Remarks

Performance
criteria

a)

Radio-frequency
electromagnetic field
Amplitude modulated

80 to 1 000
10
80

MHz
V/m
% AM (1 kHz)

EN 61000-4-3

See note 1.

A

b)

Radio-frequency
electromagnetic field
Pulse modulated

900 r 5
10
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

Hz

EN 61000-4-8

See notes 2 & 3.

A

Continuous field
Short duration

100
300

A/m

A/m

Electrostatic
discharge

r 8 contact
discharge

kV (charge voltage)

r 8 air discharge

kV (charge voltage)

d)

EN 50065-2-3:2003

Table 1 – Immunity: Enclosure port

B only for short duration CRT
display interference allowed
above 3 A/m
EN 61000-4-2

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

B

NOTE 1 Except for the ITU broadcast frequency bands: 87 MHz to 108 MHz, 174 MHz to 230 MHz and 470 MHz to 790 MHz where the level shall be 3 V.
NOTE 2 Applicable only to apparatus containing devices susceptible to magnetic fields, e.g. hall elements, electrodynamic microphones, etc.
NOTE 3 For CRTs the acceptable jitter depends upon the character size and is computed for a test level of 1 A/m as follows:
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.

- 10 -

B


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

Test
specification

Units

Basic
standard

Remarks

Performance
criteria

a)

Radio-frequency
common mode
Amplitude modulated

0,15 to 80
10
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)
r 1
r 1

Tr/Tn —s
kV (peak)
kV (peak)

EN 61000-4-5

See note 3.

B

c)

Fast transients

r 2
5/50
5

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

EN 61000-4-4

See note 4.

B

Table 2b – Immunity: Ports for process, measurement and long bus and control lines *

Environmental
phenomenon

Test
specification

Units

Basic
standard

Remarks

Performance
criteria

Radio-frequency
common mode
Amplitude modulated

0,15 to 80
10
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)
r 2
r 1

Tr/Tn —s
kV (peak)
kV (peak)

EN 61000-4-5

See note 3.

B

c)

Fast transients

r 2
5/50
5

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

EN 61000-4-4

See note 4.

B

- 11 -

a)

Notes to Tables 2a and 2b:
NOTE 1 Except for the ITU broadcast frequency band 47 MHz to 68 MHz where the level shall be 3 V.
NOTE 3 Applicable only to ports interfacing with cable whose total length may exceed 10 m according to the manufacturers functional specification.
NOTE 4 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.

EN 50065-2-3:2003

NOTE 2 The test level can be defined as the equivalent current into a 150 : load.

Environmental
phenomenon

Test
specification

Units

Basic
standard

Remarks

Performance
criteria

a)

Radio-frequency
common mode
Amplitude modulated

0,15 to 80
10
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)
r 1
r 1

Tr/Tn —s
kV (peak)
kV (peak)

EN 61000-4-5

See note 3.

B

c)

Fast transients

r 2
5/50
5

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

EN 61000-4-4

See note 3.

B

EN 50065-2-3:2003

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

NOTE 1 The test level can be defined as the equivalent current into a 150 : load.
NOTE 2 Except for the ITU broadcast frequency band 47 MHz to 68 MHz where the level shall be 3 V.

- 12 -

NOTE 3 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.

Table 4 – Immunity: a.c. input and a.c. output power ports
Environmental
phenomenon

Test
specification

Units

Basic
standard

Remarks

Performance
criteria

a)

Radio-frequency
common mode
Amplitude modulated

0,15 to 80
10
80

MHz
V

% AM (1 kHz)

EN 61000-4-6

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

A

b)

Voltage dips

30
10

% reduction
duration in ms

EN 61000-4-11

Voltage shift at zero crossing.

B

60
100

% reduction

duration in ms

See note 3.

C
See note 4.

Voltage shift at zero crossing.
See note 3.

C
See note 4.

Voltage
interruptions

> 95 %
5

% reduction
duration in s

EN 61000-4-11

d)

Surges
Common mode
Differential mode

1,2/50 (8/20)
r 4
r 4

Tr/Tn —s
kV (peak)
kV (peak)

EN 61000-4-5

B

e)

Fast transients

r 2
5/50
5

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

EN 61000-4-4

B

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

- 13 -

c)

NOTE 2 Except for the ITU broadcast frequency band 47 MHz to 68 MHz where the level shall be 3 V.
NOTE 3 Applicable only to input ports.
NOTE 4 Manufacturers are strongly recommended to design to performance criterion B in order not to cause problems for users. If it is necessary to use criterion C the
instruction shall draw attention to the need to manually reset the equipment after voltage dips or interruptions.

EN 50065-2-3:2003


Table 5 –
- I mmunity: Earth port (functional ground terminal)
Environmental
phenomenon
a)

b)

Test
specification

Units

Basic
standard

Radio-frequency
common mode.

Amplitude modulated.

0,15 to 80
3
80

MHz
V
% AM (1 kHz)

EN 61000-4-6

Fast transients

± 0,5
5/50
5

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

EN 61000-4-4

Remarks

Performance
criterion

See NOTE 1.

A

EN 50065-2-3:2003



The test level specified is prior to
modulation.
See NOTE 2.

B

Use of the capacitive clamp.

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.

- 14 -


– 15 –

7.2.2

EN 50065-2-3:2003

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
sub-bands) listed in 4.1 or 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 dB(μV) in magnitude.
NOTE 1 Due to the modulation method, the peak envelope value is about 5 dB above the values shown in 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 measuring instrument is then disconnected from the coupling network and the disturbing
signal is applied to the EUT using port A in the circuit in annex A. 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

2 μF capacitor

50 :
resistor

~
1:1 ratio
transformer

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


EN 50065-2-3:2003

– 16 –

Table 6 – Input a.c. power ports
Frequency range

ab

Level dB(—V)

Criterion

134 (note 1)

A

10 kHz to 94 kHz

134 to 120 (notes 1 and 2)

A

96 kHz to 124 kHz

134

B

126 kHz to 139 kHz

134

B

141 kHz to 147,5 kHz

134

B

0,150 MHz to 30 MHz

66

A

3 kHz 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(—V) below those shown in the table and with criterion A applied.
NOTE 2 The value decreases linearly from 134 dB(—V) to 120 dB(—V), 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
practice. 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.


– 17 –

EN 50065-2-3:2003

Annex A
(normative)
Test circuit used for immunity tests
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.
NOTE

Criterion C is not used in this part and is retained only for compatibility with other parts of this standard.

 Text deleted
NOTE

The figure shows the case of testing for frequencies from 9 kHz upwards.

Port B

Mains
Supply

Additional
filter
section

Artificial network A to
CISPR 16-1

50 :
Termination

Additional
filter
section

Stimulus

660
—H
choke

660
—H
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


EN 50065-2-3:2003

– 18 –

Port B
 Port A is used for the tests a), d) and e) in Table 4 and tests a), b) in Table 5.
should be used to apply tests b) and c) in Table 4 in order that the operation of the stimulus,
connected to artificial network A, is not also disturbed by the test.
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.
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.