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IEC 60263
Edition 4.0 2020-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Scales and sizes for plotting frequency characteristics and polar diagrams
Échelles et dimensions des graphiques pour le tracé des courbes de réponse
en fréquence et des diagrammes polaires
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IEC 60263
Edition 4.0 2020-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Scales and sizes for plotting frequency characteristics and polar diagrams
Échelles et dimensions des graphiques pour le tracé des courbes de réponse
en fréquence et des diagrammes polaires
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.140.50 ISBN 978-2-8322-8497-1
– 2 – IEC 60263:2020 © IEC 2020
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Characteristics plotted versus a logarithmic frequency scale . 6
4.1 Decibel vs. log frequency plots . 6
4.2 Log quantities vs. log frequency plots . 7
5 Polar level diagrams . 7
5.1 General . 7
5.2 Polar plots of absolute level . 7
5.3 Polar plots of relative level . 7
Annex A (informative) Examples of the requirements specified in this document . 8
Annex B (informative) Information regarding linear y-axis vs. logarithmic frequency
plots . 14
B.1 General . 14
B.2 Phase . 14
B.3 Group delay . 14
Figure A.1 – Example of a microphone calibration curve showing the relative response
in dB as a function of frequency with an aspect ratio of 10 dB/decade . 8
Figure A.2 – Example of the response of a loudspeaker crossover filter network with
an aspect ratio of 20 dB/decade . 9
Figure A.3 – Example of the response of a loudspeaker with an aspect ratio of
25 dB/decade (dB re. 20 µPa) . 9
Figure A.4 – Example of the response of a hearing aid with an aspect ratio of
50 dB/decade. 10
Figure A.5 – Example of the noise from a mobile communications device with an
aspect ratio of 0,5 decades/decade (10 dB/decade) . 10
Figure A.6 – Example of amplifier noise with an aspect ratio of 1 decade/decade
(20 dB/decade) . 11
Figure A.7 – Example of total harmonic distortion of an earphone with an aspect ratio
of 1,25 decades/decade (25 dB/decade) . 11
Figure A.8 – Example of total harmonic distortion of a loudspeaker with an aspect
ratio of 2,5 decades/decade (50 dB/decade) . 12
Figure A.9 – Example of a polar diagram of absolute level with a range of 60 dB,
showing the sound pressure level from a siren at a distance of 3 m . 12
Figure A.10 – Example of a polar diagram of relative level with a range of 30 dB and a
reference circle radius of 25 dB, showing the directional response of a highly
directional shotgun microphone at 2,5 kHz . 13
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SCALES AND SIZES FOR PLOTTING FREQUENCY
CHARACTERISTICS AND POLAR DIAGRAMS
FOREWORD
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International Standard IEC 60263 has been prepared by IEC technical committee TC 29:
Electroacoustics.
This fourth edition cancels and replaces the third edition published in 1982. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) the scope is expanded to include electronic files (e.g., PDF), scientific publications, graphs
in other standards, and screen displays in programs and apps;
b) a Terms and Definitions clause has been added;
c) aspect ratios of 20 dB/decade, and 0,5, 1, 1,25, and 2,5 decades/decade have been added;
d) ranges of 60 dB or 30 dB are specified for polar plots of absolute level; a 30 dB range is
specified for polar plots of relative level;
e) as most graphs are now computer generated, tolerances and sizes have been removed;
f) all informative figures have been updated with contemporar
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