SIST EN 61329:1999

SLOVENSKI STANDARD
01-april-1999
Sound system equipment - Methods of measuring and specifying the performance
of sounders (electroacoustic transducers for tone production) (IEC 61329:1995)
Sound system equipment - Methods of measuring and specifying the performance of
sounders (electroacoustic transducers for tone production)
Geräte für Tonsysteme - Verfahren zur Messung und Angabe der Leistungskennwerte
von Schallgebern (Elektroakustische Wandler zur Tonerzeugung)
Equipements pour systèmes électroacoustiques - Méthodes de mesure et de
spécification de la qualité de fonctionnement des sondeurs (transducteurs
électroacoustiques de production de sons)
Ta slovenski standard je istoveten z: EN 61329:1996
ICS:
17.140.50 Elektroakustika Electroacoustics
33.160.50 Pribor Accessories
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

NORME CEI
INTERNATIONALE IEC
INTERNATIONAL
Première édition
STANDARD
First edition
1995-11
Equipements pour systèmes
électroacoustiques —
Méthodes de mesure et de spécification
de la qualité de fonctionnement des sondeurs
(transducteurs électroacoustiques de
production de sons)
Sound system equipment —
Methods of measuring and specifying
the performance of sounders
(electroacoustic transducers for tone
production)
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– 3 –
1329 © IEC:1995
CONTENTS
Page
FOREWORD 5
Clause
1 Scope and object 7
2 Normative references
3 Definitions and symbols
3.1 Classification, structures and components
3.2 Characteristics, symbols and units
Rated conditions 4
5 Characteristics and measuring methods
13 5.1 Measuring conditions
15 5.2 Measuring equipment
5.3 Electroacoustic transducer characteristics of the sounder
5.4 Electrical and mechanical characteristics of sounders
5.5 Piezoelectric diaphragm 21
Physical and other characteristics 23
6.1 Characteristics for all transducers
6.2 Characteristics for sounders 23
6.3 Characteristics for piezoelectric diaphragms
Classification of the characteristics to be specified
Tables
Characteristics of sounders to be specified, and classification
Characteristics of piezoelectric diaphragm to be specified, and classification
Figures
29 1 Voltage and d.c. component of square-wave signals
31 2 Diagram of sounder measuring system
33 3 Diagram of sounder testing system
33 4 Diagram of piezoelectric diaphragm measuring system
35 5 Example of a diaphragm supporter
37 Annex A – Bibliography
- 5 -
1329 ©IEC:1995
INTERNATIONAL ELECTROTECHNICAL COMMISSION
SOUND SYSTEM EQUIPMENT —
Methods of measuring and specifying the performance of sounders
(electroacoustic transducers for tone production)
FOREWORD
The IEC (International Electrotechnical Commission) is a worldwide organization for standardization
1)
comprising all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
The documents produced have the form of recommendations for international use and are published in the
3)
s or guides and they are accepted by the National Committees in that
rt
form of standards, technical repo
sense.
In order to promote international unification, IEC National Committees undertake to apply IEC International
4)
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
5)
equipment declared to be in conformity with one of its standards.
Attention is drawn to the possibility that some of the elements of this International Standard may be the
6)
subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 1329 has been prepared by IEC technical committee 84: Equipment
and systems in the field of audio, video and audiovisual engineering.
The text of this standard is based on the following documents:
Report on voting
DIS
84/446/RVD
84/407+407A/DIS
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
Annex A is for information only.

1329 ©IEC:1995 – 7 -
SOUND SYSTEM EQUIPMENT -
Methods of measuring and specifying the performance of sounders
(electroacoustic transducers for tone production)
1 Scope and object
This International Standard is applicable to sounders, which are treated as entirely passive
electroacoustic transducer elements. Piezoelectric diaphragms, which are the principal
components of piezoelectric sounders, are also included. Buzzers which are sound sources
with built-in electric circuits are excluded.
The object of this standard is to standardize the definitions relating to these electroacoustic
transducers, and to list characteristics to be specified and the relevant methods of
measurement.
2 Normative references
The following normative documents contain provisions which, through reference in this text,
constitute provisions of this International Standard. At the time of publication, the editions
indicated were valid. All normative documents are subject to revision, and parties to
agreements based on this International Standards are encouraged to investigate the possibility
of applying the most recent editions of the normative documents listed below. Members of IEC
and ISO maintain registers of currently valid International Standards.
IEC 268-1: 1985, Sound system equipment – Pa rt 1: General
IEC 268-2: 1987, Sound system equipment – Pa rt 2: Explanation of general terms and
calculation methods
IEC 651: 1979, Sound level meters
IEC 1094-1: 1992, Measurement microphones – Part 1: Specifications for laboratory standard
microphones
IEC 1094-4: 1995, Measurement microphones – Part 4: Specifications for working standard
microphones
1329 ©IEC:1995 – 9 –
3 Definitions and symbols
For the purpose of this International Standard, the following definitions and symbols apply.
3.1 Classification, structures and components
3.1.1 sounder: Electroacoustic transducer for the production of single or multiple tone
signals.
3.1.2 buzzer: Device consisting of a sounder and an electric circuit for self-excited or
externally excited oscillation.
NOTE — Buzzers are not included in this standard.
Sounder consisting of a diaphragm with an electro-
3.1.3 electromagnetic sounder:
magnetic driver (e.g. a moveable armature or a magnet driven by electromagnetic force), built
in a housing.
3.1.4 electrodynamic sounder: Sounder consisting of a diaphragm with an electro-dynamic
driver (e.g. a moveable coil or flat electric conductor pattern in a magnetic field), built in a
housing.
3.1.5 piezoelectric sounder: Sounder consisting of a piezoelectric diaphragm built in a
housing.
3.1.6 piezoelectric diaphragm: Diaphragm consisting of a metal plate and one or two
piezoelectric ceramic plates cemented together so that radial expansion and contraction of the
ceramic plate(s) is transformed to bending of the diaphragm for sound radiation.
3.1.7 piezoelectric ceramic plate; piezoelectric ceramic disc: Thin plate made of a
piezoelectric ceramic, for example lead zirconate titanate (PZT) ceramic, of which each side is
metallized. The ceramic plate is polarized so as to deform radially when a voltage is applied
across it.
3.2 Characteristics, symbols and units
3.2.1 input voltage (sinusoidal signal): RMS voltage of a sinusoidal signal applied to a
sounder or a piezoelectric diaphragm. Symbol: unit: V.
Urms,
3.2.2 input voltage (square wave signal): Peak-to-peak voltage of a square-wave signal
applied to a sounder. Symbol: Upp , unit: V.
NOTE — The sounder or piezoelectric diaphragm may require, or tolerate, a d.c. component in addition to the
square wave, in which case the required or tolerated signal waveform will be specified, as illustrated in
figure 1.
3.2.3 d.c. polarity (of an electromagnetic or an electrodynamic sounder): Direction of the
d.c. component applied to an electromagnetic or electrodynamic sounder which is designed to
be driven by a positively-biased or negatively-biased square-wave input voltage.

1329 © IEC:1995 - 11 -
3.2.4
direction of polarization (of a piezoelectric ceramic plate): Direction of the d.c.
voltage, applied for polarization of the piezoelectric ceramic during production.
3.2.5
resonant frequency (of a sounder): Frequency within the rated frequency range, at
r
which the output sound pressure of a sounder shows a local maximum. Symbol: f , unit: Hz.
3.2.6 resonant frequency (of a piezoelectric diaphragm): Frequency close to the
eigenfrequency of the first symmetrical vibration mode for the free boundary condition, at which
the electrical impedance of the piezoelectric diaphragm shows a local minimum. Symbol: fr,
unit: Hz.
3.2.7 anti-resonant frequency (of a piezoelectric diaphragm): Frequency close to the
eigenfrequency of the first symmetrical vibration mode for the free boundary condition, at which
the electrical impedance of a piezoelectric diaphragm shows a local maximum. Symbol: fa,
unit: Hz.
3.2.8 sensitivity level to voltage (with A-weighting): Output sound pressure level of a
sounder measured using a sound level meter with A-weighting, referred to an input voltage of
1 V and to a distance of 1 m. The measuring frequency and input signal waveform are as
specified by the manufacturer. Symbol: SA , unit: dB ref. 20 µPa.
NOTE — The A-weighting characteristic is specified in IEC 651.
Distance between the reference point of a sounder to be
3.2.9 distance to measuring point:
measured and the reference point of the microphone used for the measurements, specified as
one of the measuring conditions. Symbol: r, unit: m.
3.2.10 principal axis (of microphone): Line through the geometrical centre, and
perpendicular to the reference plane, of the microphone used for measurement.
NOTE — The front su rface of the microphone should be taken as the reference plane, if the reference plane
of the microphone is not specified by the manufacturer.
3.2.11 reference point (of microphone): Point where the principal axis of the microphone
intersects the reference plane. For additional information, see note to 3.2.10.
4 Rated conditions
For a full explanation of the terms 'rated value' and 'rated condition', see IEC 268-2. The
following conditions shall be specified by the manufacturer of the sounder.
4.1 Rated input voltage
The continuous input voltage at which the sounder operates normally for the specified period of
r, unit: V.
time. The frequency and waveform of the input signal shall be specified. Symbol: U

1329 ©IEC:1995 - 13 -
4.2 Rated maximum input voltage
The maximum voltage which can be applied to the sounder for a specified short time. The
frequency and waveform of the input signal shall be specified. Symbol: U m, unit: V.
4.3 Rated frequency range
The frequency range for continuous sinusoidal input signal over which the sounder can operate
normally. The input voltage shall be specified.
Rated resistance
4.4
The d.c. resistance of an electromagnetic or electrodynamic sounder specified for matching
purposes. Symbol: Rr, unit: 0.
4.5 Rated capacitance
The electrical capacitance of the piezoelectric sounder specified for matching purposes.
Symbol: Cr , unit: nF.
4.6 Principal axis (of sounder)
The line through the geometrical centre of the sound hole(s), perpendicular to the front surface
of the sounder. For additional information, see note to 4.7.
Reference point (of sounder)
4.7
The point where the principal axis of the sounder intersects the front surface.
NOTE — Strictly, this term and that defined in the previous subclause should include the word 'rated' (for
example, 'rated reference point'), since they are specified by the manufacturer in accordance with these
definitions and cannot be measured, but confusion is unlikely even if the shorter terms are used.
4.8 Rated working temperature range
The environmental temperature range over which a sounder can operate normally.
5 Characteristics and measuring methods
5.1 Measuring conditions
5.1.1 Environmental noise and other interferences
The disturbance of measured sound pressure level due to environmental or other noises shall
not exceed 1 dB.
5.1.2 Climatic and environmental conditions
Unless otherwise specified by the manufacturer, measurements shall be made under the
following environmental conditions:
- ambient temperature: 15 °C to 35 °C, preferably at 20 °C;

1329 © IEC:1995 - 15 -
- relative humidity: 25%to75%;
- air pressure: 86 kPa to 106 kPa.
NOTE — For further information, see IEC 268-1, IEC 68 and IEC guide 106.
5.1.3 Acoustic environment for measurement
In the frequency range 500 Hz to 10 kHz, the variation, due to acoustic reflections or
reverberation, of sound pressure level with distance shall not deviate by more than 1 dB from
the response in an ideal free sound field, in the range of distance from 0,1 m to that of the
measuring point.
5.1.4 Measuring signal waveform
The waveform of the signal for measurement
...