SIST EN 61260-3:2016
(Main)Electroacoustics - Octave-band and fractional-octave-band filters - Part 3: Periodic tests (IEC 61260-3:2016)
Electroacoustics - Octave-band and fractional-octave-band filters - Part 3: Periodic tests (IEC 61260-3:2016)
1.1 This part of IEC 61260 describes procedures for periodic testing of octave-band and
fractional-octave-band filters that were designed to conform to the class 1 or class 2
specifications given in IEC 61260-1:2014. The aim of this standard is to ensure that periodic
testing is performed in a consistent manner by all laboratories.
1.2 The purpose of periodic testing is to assure the user that the performance of an octaveband
and fractional-octave-band filter conforms to the applicable specifications of IEC 61260-
1 for a limited set of key tests and for the environmental conditions under which the tests
were performed.
1.3 The extent of the tests in this standard is deliberately restricted to the minimum
considered necessary for periodic tests.
1.4 Periodic tests described in this standard apply to filters for which the manufacturer
claims conformance to the specifications in IEC 61260-1:2014. Periodic tests in this standard
apply to filters for which the model has been, or has not been, pattern approved by an
independent testing organization responsible for pattern approvals in accordance with the test
procedures of IEC 61260-2.
1.5 Because of the limited extent of the periodic tests, if evidence of pattern approval is not
publicly available, no general conclusion about conformance to the specifications of
IEC 61260-1 can be made, even if the results of the periodic tests conform to all applicable
requirements of this standard.
Elektroakustik - Bandfilter für Oktaven und Bruchteile von Oktaven - Teil 3: Periodische Einzelprüfung
Electroacoustique - Filtres de bande d'octave et de bande d'une fraction d'octave - Partie 3: Essais périodiques
L'IEC 61260-3:2016 décrit les procédures relatives aux essais périodiques concernant les filtres de bande d'octave et les filtres de bande d'une fraction d'octave, qui ont été conçus pour satisfaire aux spécifications pour la classe 1 ou 2 données dans l'IEC 61260-1:2014. L'objectif de la présente norme est de s'assurer que les essais périodiques sont réalisés de manière cohérente par l'ensemble des laboratoires. Cette première édition de l'IEC 61260-3 (conjointement à l'IEC 61260-1:2014 et l'IEC 61260-2:2016) annule et remplace la première édition de l'IEC 61260 parue en 1995 et son Amendement 1 paru en 2001. Cette édition constitue une révision technique.
Elektroakustika - Oktavni in frakcijski oktavni filtri - 3. del: Redno preskušanje (IEC 61260-3:2016)
1.1 Ta del standarda IEC 61260 opisuje postopke za redno preskušanje oktavnih in frakcijskih oktavnih filtrov, zasnovanih v skladu s specifikacijami razreda 1 ali 2, podanimi v standardu IEC 61260-1:2014. Cilj tega standarda je zagotoviti skladno opravljanje rednih preskusov v vseh preskuševalnih laboratorijih.
1.2 Namen rednega preskušanja je zagotoviti uporabniku, da je delovanje oktavnih in frakcijskih oktavnih filtrov v skladu z ustreznimi specifikacijami v standardu IEC 61260-1 za omejen nabor ključnih preskusov in za okoljske pogoje, v katerih so bili preskusi opravljeni.
1.3 Obseg preskusov v tem standardu je namerno omejen na najmanjšo vrednost, potrebno za redne preskuse.
1.4 Redni preskusi, opisani v tem standardu, se uporabljajo za filtre, za katere proizvajalec navaja skladnost s specifikacijami v standardu IEC 61260-1:2014. Redni preskusi v tem standardu se uporabljajo za filtre, za katere je model tipsko odobrila (ali ni odobrila) neodvisna preskuševalna organizacija, odgovorna za tipske odobritve v skladu s preskusnimi postopki v standardu IEC 61260-2.
1.5 Če dokazilo o tipski odobritvi zaradi omejenega obsega rednih preskusov ni javno dostopno, splošne ugotovitve glede skladnosti s specifikacijami v standardu IEC 61260
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 61260-3:2016
01-september-2016
1DGRPHãþD
SIST EN 61260:1998
SIST EN 61260:1998/A1:2006
Elektroakustika - Oktavni in frakcijski oktavni filtri - 3. del: Redno preskušanje (IEC
61260-3:2016)
Electroacoustics - Octave-band and fractional-octave-band filters - Part 3: Periodic tests
(IEC 61260-3:2016)
Electroacoustique - Filtres de bande d'octave et de bande d'une fraction d'octave - Partie
3: Essais périodiques
Ta slovenski standard je istoveten z: EN 61260-3:2016
ICS:
17.140.50 Elektroakustika Electroacoustics
SIST EN 61260-3:2016 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 61260-3:2016
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SIST EN 61260-3:2016
EUROPEAN STANDARD EN 61260-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2016
ICS 17.140.50 Supersedes EN 61260:1995 (partially)
English Version
Electroacoustics - Octave-band and fractional-octave-band filters
- Part 3: Periodic tests
(IEC 61260-3:2016)
Electroacoustique - Filtres de bande d'octave et de bande Elektroakustik - Bandfilter für Oktaven und Bruchteile von
d'une fraction d'octave - Partie 3: Essais périodiques Oktaven - Teil 3: Periodische Einzelprüfung
(IEC 61260-3:2016) (IEC 61260-3:2016)
This European Standard was approved by CENELEC on 2016-04-27. 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 CEN-CENELEC
Management Centre 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 CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 61260-3:2016 E
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SIST EN 61260-3:2016
EN 61260-3:2016
European foreword
The text of document 29/846/CDV, future edition 1 of IEC 61260-3, prepared by IEC TC 29,
Electroacoustics, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as
EN 61260-3:2016.
The following dates are fixed:
(dop) 2017-01-27
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2019-04-27
standards conflicting with the
document have to be withdrawn
This document supersedes EN 61260:1995.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent
rights.
Endorsement notice
The text of the International Standard IEC 61260-3:2016 was approved by CENELEC as a European
Standard without any modification.
2
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EN 61260-3:2016
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 61260-1 2014 Electroacoustics - Octave-band and EN 61260-1 2014
fractional-octave-band filters -- Part 1:
Specifications
IEC 61260-2 2016 Electroacoustics - Octave-band and EN 61260-2 2016
fractional-octave-band filters - Part 2:
Pattern-evaluation tests
IEC 61672-1 - Electroacoustics - Sound level meters -- Part EN 61672-1 -
1: Specifications
ISO/IEC Guide 98-3 - Uncertainty of measurement - Part 3: Guide - -
to the expression of uncertainty in
measurement (GUM:1995)
ISO/IEC Guide 98-4 - Uncertainty of measurement -- Part 4: Role - -
of measurement uncertainty in conformity
assessment
3
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SIST EN 61260-3:2016
IEC 61260-3
®
Edition 1.0 2016-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electroacoustics – Octave-band and fractional-octave-band filters –
Part 3: Periodic tests
Électroacoustique – Filtres de bande d'octave et de bande d'une fraction
d'octave –
Partie 3: Essais périodiques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.140.50 ISBN 978-2-8322-3246-0
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references. 6
3 Terms and definitions . 7
4 Submission for testing . 7
5 Conformance . 7
6 Preliminary inspection . 8
7 Power supply . 8
8 Environmental conditions . 8
9 Mandatory facilities and general requirements . 8
9.1 General . 8
9.2 Test instruments . 10
10 Test of relative attenuation at midband frequency or effective bandwidth deviation . 10
10.1 General . 10
10.2 Tests of relative attenuation at midband frequency . 10
10.3 Test of effective bandwidth deviation . 10
11 Linear operating range, measurement range, level range control and overload
indicator . 11
12 Test of lower limit of linear operating range . 12
13 Measurement of relative attenuation . 12
14 Documentation . 13
Annex A (informative) Uncertainty related to test by sinusoidal sweeps . 16
A.1 General . 16
A.2 Digitally generated signal . 16
A.3 Test signal from a signal generator . 17
A.4 Comparing measurements . 18
Annex B (informative) Test of effective bandwidth deviation with the use of an
exponential sweep – Example . 19
B.1 General . 19
B.2 Example. 19
Annex C (informative) Normalized frequencies for test of one-third-octave-band filters . 21
C.1 General . 21
C.2 Example calculation . 21
Bibliography . 23
Table 1 – Frequency parameter R and acceptance limits on relative attenuation for
fractional-octave-band filters . 13
Table C.1 – Normalized test frequencies and acceptance limits on relative attenuation
for one-third-octave-band filters . 22
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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROACOUSTICS – OCTAVE-BAND
AND FRACTIONAL-OCTAVE-BAND FILTERS –
Part 3: Periodic tests
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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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 IEC 61260-3 has been prepared by IEC technical committee 29:
Electroacoustics.
This first edition of IEC 61260-3 (together with IEC 61260-1:2014 and IEC 61260-2:2016),
cancels and replaces the first edition of IEC 61260 published in 1995 and its Amendment 1
published in 2001. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to IEC 61260.
a) The single document in the first edition of IEC 61260:1995 is now separated into three
parts of IEC 61260 covering: specifications, pattern evaluation tests and periodic tests;
b) IEC 61260:1995 specified three performance categories: class 0, 1 and 2 while the
IEC 61260 series specifies requirements for class 1 and 2;
c) In IEC 61260:1995, the design goals for the specification can be based on base-2 or base-
10 design. In the IEC 61260 series only base-10 is specified;
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d) The reference environmental conditions have been changed from 20 °C/65 % RH to
23 °C/50 % RH;
e) IEC 61260:1995 specified tolerance limits without considering the uncertainty of
measurement for verification of the specifications while the IEC 61260 series specifies
acceptance limits for the observed values and maximum-permitted uncertainty of
measurements for laboratories testing conformance to specifications in the standard.
The text of this standard is based on the following documents:
CDV Report on voting
29/846/CDV 29/882A/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.
A list of all the parts of the IEC 61260 series, published under the general title
Electroacoustics – Octave-band and fractional-octave-band filters can be found on the IEC
website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website 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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INTRODUCTION
IEC 61260:1995 and IEC 61260:1995/AMD 1:2001 are now separated into the following three
parts of IEC 61260 series:
• Part 1: Specifications
• Part 2: Pattern evaluation tests
• Part 3: Periodic tests
For assessments of conformance to performance specifications, IEC 61260-1 uses different
criteria than were used for the IEC 61260:1995 edition.
IEC 61260:1995 did not provide any requirements or recommendations to account for the
uncertainty of measurement in assessments of conformance to specifications. This absence
of requirements or recommendations to account for uncertainty of measurement created
ambiguity in determinations of conformance to specifications for situations where a measured
deviation from a design goal was close to the limit of the allowed deviation. If conformance
was determined based on whether a measured deviation did or did not exceed the limits, the
end-user of the octave-band and fractional-octave-band filters incurred the risk that the true
deviation from a design goal exceeded the limits.
To remove this ambiguity, IEC Technical Committee 29, at its meeting in 1996, adopted a
policy to account for measurement uncertainty in assessments of conformance in International
Standards that it prepares.
This edition of IEC 61260-3 uses an amended criterion for assessing conformance to a
specification. Conformance is demonstrated when (a) measured deviations from design goals
do not exceed the applicable acceptance limits and (b) the uncertainty of measurement does
not exceed the corresponding maximum-permitted uncertainty. Acceptance limits are
analogous to the tolerance limits allowances for design and manufacturing implied in the
IEC 61260:1995.
Actual and maximum-permitted uncertainties of measurement are determined for a coverage
probability of 95 %. Unless more specific information is available, the evaluation of the
contribution of a specific filter or filter set to a total measurement uncertainty can be based on
the acceptance limits and maximum-permitted uncertainties specified in this standard.
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ELECTROACOUSTICS – OCTAVE-BAND
AND FRACTIONAL-OCTAVE-BAND FILTERS –
Part 3: Periodic tests
1 Scope
1.1 This part of IEC 61260 describes procedures for periodic testing of octave-band and
fractional-octave-band filters that were designed to conform to the class 1 or class 2
specifications given in IEC 61260-1:2014. The aim of this standard is to ensure that periodic
testing is performed in a consistent manner by all laboratories.
1.2 The purpose of periodic testing is to assure the user that the performance of an octave-
band and fractional-octave-band filter conforms to the applicable specifications of IEC 61260-
1 for a limited set of key tests and for the environmental conditions under which the tests
were performed.
1.3 The extent of the tests in this standard is deliberately restricted to the minimum
considered necessary for periodic tests.
1.4 Periodic tests described in this standard apply to filters for which the manufacturer
claims conformance to the specifications in IEC 61260-1:2014. Periodic tests in this standard
apply to filters for which the model has been, or has not been, pattern approved by an
independent testing organization responsible for pattern approvals in accordance with the test
procedures of IEC 61260-2.
1.5 Because of the limited extent of the periodic tests, if evidence of pattern approval is not
publicly available, no general conclusion about conformance to the specifications of
IEC 61260-1 can be made, even if the results of the periodic tests conform to all applicable
requirements of this standard.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 61260-1:2014, Electroacoustics – Octave-band and fractional-octave-band filters – Part 1:
Specifications
IEC 61260-2:2016, Electroacoustics – Octave-band and fractional-octave-band filters – Part 2:
Pattern-evaluation tests
IEC 61672-1, Electroacoustics – Sound level meters – Part 1: Specifications
ISO/IEC Guide 98-3, Uncertainty of measurement – Part 3: Guide to the expression of
uncertainty in measurement (GUM:1995)
ISO/IEC Guide 98-4, Uncertainty of measurement – Part 4: Role of measurement uncertainty
in conformity assessment
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3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61260-1,
ISO/IEC Guide 98-3 and ISO/IEC Guide 98-4 apply.
4 Submission for testing
4.1 An instruction manual applicable to the model and version of the filter shall be available
in order to perform periodic tests of a filter. If an applicable instruction manual is not
submitted along with the filter, nor available at the calibration laboratory, nor publicly
accessible from the Internet web site of the manufacturer or supplier of the filter, then no
periodic tests shall be performed.
4.2 The source for the instruction manual shall be described in the documentation for the
periodic tests.
4.3 All items or accessories for the filter that are necessary for periodic testing shall
accompany the filter when it is submitted for testing.
4.4 Periodic tests as described in this standard shall not be performed unless the markings
on the filter are as required by IEC 61260-1 or there is evidence that the filter was originally
so marked. At least the serial number and the model designation shall be visible on the filter
or instrument containing the filter.
4.5 Data required to perform the periodic tests shall be available, and the source of the
data shall be recorded and reported by the laboratory. The data shall include all relevant
information required by IEC 61260-1.
5 Conformance
5.1 Conformance to a performance specification is demonstrated when the following criteria
are both satisfied:
a) a measured deviation from a design goal does not exceed the applicable acceptance limit
and;
b) the corresponding uncertainty of measurement does not exceed the corresponding
maximum-permitted uncertainty of measurement given in IEC 61260-1 for the same
coverage probability of 95 %.
IEC 61260-1:2014 gives example assessments of conformance using these criteria.
5.2 Laboratories performing periodic tests shall calculate all uncertainties of measurements
in accordance with the guidelines of ISO/IEC Guide 98-3. Actual measurement uncertainties
shall be calculated for a coverage probability of 95 %. Calculation of the actual measurement
uncertainty for a particular test should consider at least the following components, as
applicable:
• the uncertainty attributed to calibration of the individual instruments and equipment used
to perform the test;
• the uncertainty resulting from environmental effects or adjustments;
• the uncertainty resulting from errors that may be present in the applied signals;
• the uncertainty attributed to effects associated with the repeatability of the results of the
measurements. When a laboratory is only required to perform a single measurement, it is
necessary for the laboratory to make an estimate of the contribution of random effects to
the total uncertainty. The estimate should be determined from an evaluation of several
measurement results previously obtained for a similar filter and parameter;
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• the uncertainty associated with the resolution of the applied display device. For digital
display devices that indicate signal levels with a resolution of 0,1 dB, the uncertainty
component should be taken as a rectangular distribution with semi-range of 0,05 dB; and
• the uncertainty associated with each correction applied to the measurement data.
5.3 If an actual uncertainty of measurement for a test performed by the laboratory exceeds
the corresponding maximum-permitted uncertainty, the result of the test shall not be used to
evaluate conformance to this standard for periodic testing.
6 Preliminary inspection
Prior to any measurements, the filter and all accessories shall be visually inspected to ensure
that the filter is in normal working order. All relevant controls shall be operated to ensure that
they are in working order. If the controls or other essential elements are not in proper working
order, no periodic tests shall be performed.
7 Power supply
For all tests, the filter shall be powered from its preferred supply or a suitable alternative.
Before and after conducting the set of tests, the power supply for the filter shall be checked
by the method stated in the instruction manual to ensure that it is within the specified
operating limits. If the voltage or the equivalent indication of the status of the power supply is
not within the operating limits and the reason cannot be attributed to partially discharged
batteries or an incorrect selection of the voltage of the public power supply, then no periodic
tests shall be performed as a malfunction is indicated.
8 Environmental conditions
8.1 Periodic tests shall be performed within the following ranges of environmental
conditions: 20 °C to 26 °C for air temperature, and 25 % to 70 % for relative humidity.
8.2 As a minimum, the air temperature and the relative humidity shall be measured and
recorded at the start and end of periodic testing. The recorded values expanded with the
actual expanded uncertainty of measurement shall not exceed the limits in 8.1.
9 Mandatory facilities and general requirements
9.1 General
9.1.1 No test specified in this standard shall be omitted unless the bandpass filter does not
possess the feature described for the test.
9.1.2 If the filter does not possess the mandatory features listed in IEC 61260-1, including
an overload indicator and means to check that the power supply is adequate for battery
powered instruments which contain the filter, the filter does not conform to the specifications
of IEC 61260-1, and no periodic tests shall be performed.
9.1.3 If, for an instrument containing filters with more than one bandwidth, the supplier
claims conformance to IEC 61260-1, each bandwidth for which the supplier claims
conformance shall demonstrate conformance to the specifications in this standard, otherwise
the instrument does not conform to the requirement in this standard.
9.1.4 For all periodic tests, the configuration of the filter shall be as specified in the
instruction manual for one of the normal modes of operation, including required accessories.
The input and output terminals shall be terminated with the impedances specified by the
supplier, if appropriate.
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9.1.5 For filters enclosed in a sound level meter with detachable preamplifier, the signal
input to the filter may be, as specified by the supplier, the input of the preamplifier through a
suitable input device replacing the microphone, or the terminal where the signal from the
preamplifier normally is connected.
9.1.6 For filters with digital readout devices, or with an output that is available in a
manufacturer-specified digital format (for example over a digital interface connection), the
level of the output should be determined from the numeric readout or via the digital output to
a suitable display or recording device.
9.1.7 If the filter is enclosed in an instrument containing a level detector and a display
device for displaying the level of the filtered signal with a resolution of at least 0,1 dB, the
displayed value from this display device shall be used for testing. If an electrical output is
provided corresponding to the displayed value and the testing laboratory intends to utilize the
electrical output instead of the display device, the laboratory shall verify that changes in the
levels of applied electrical input signals produce corresponding changes in the signal levels
indicated on the display device and at the electrical output that are in accordance with the
specifications of IEC 61260-1. Where multiple outputs are present, if an output is specified in
the instruction manual for testing, this output should be used for the p
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