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BS EN IEC 60268-22:2020 2021

BS EN IEC 60268-22:2020 2021

$198.66

Sound system equipment – Electrical and mechanical measurements on transducers

Published By Publication Date Number of Pages
BSI 2021 62
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IEC 60268-22:2020 applies to transducers converting an electrical input signal into a mechanical or acoustical output signal. However, if the electrical input terminals and the surface of the radiator are accessible, this document can also apply to passive and active sound systems such as loudspeakers, headphones, TV-sets, multi-media devices, personal portable audio devices, automotive sound systems and professional equipment. This document describes only electrical and mechanical measurements that help assess the transfer behaviour of the device under test (DUT). This includes operating the DUT in both the small- and large-signal domains. The influence of the target application’s acoustical boundary conditions (e.g. car interior) can also be considered in the physical evaluation of the sound system. Perception and cognitive evaluations of the reproduced sound and the impact of perceived sound quality are outside the scope of this document.

PDF Catalog

PDF Pages PDF Title
2 undefined
5 Annex ZA(normative)Normative references to international publicationswith their corresponding European publications
7 English
CONTENTS
10 FOREWORD
12 INTRODUCTION
13 1 Scope
2 Normative references
14 3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
3.2 Abbreviated terms
4 Type description
5 Marking of terminals and controls
6 Physical characteristics
6.1 Dimensions
15 6.2 Mass
6.3 Connectors and cable assemblies
7 Conditions
7.1 Rated conditions
7.2 Climatic conditions
7.2.1 Conditions for normal testing
7.2.2 Conditions for climatic testing
7.3 Standard measuring conditions
16 8 Test signals
8.1 General
8.2 Small-signal condition
9 Acoustical environment
9.1 General
9.2 Free-field conditions
17 9.3 Half-space, free-field conditions
9.5 Target application conditions
9.6 Vacuum condition
9.6.1 General
9.6.2 Method of measurement
9.7 Plane-wave tube condition
9.8 Non-acoustical measurement condition
18 10 Positioning of the radiator
10.1 Rated geometrical conditions
10.1.1 General
10.1.2 Reference plane and normal vector
10.1.3 Reference point
10.1.4 Orientation vector
Figures
Figure 1 ā€“ Rated conditions used to describe the geometry and position of the radiator in the coordinate system
19 10.2 Target application condition
11 Measurement equipment and test results
12 Accuracy of the mechanical and electrical measurement
13 Mounting of the DUT
13.1 Mounting and acoustic loading of drive units
20 13.2 Mounting and acoustic loading of an electro-acoustic system
13.3 Requirements for laser vibrometry
14 Preconditioning
15 Rated ambient conditions
15.1 Temperature ranges
15.1.1 Performance limited temperature range
15.1.2 Damage limited temperature range
15.2 Humidity ranges
15.2.1 Relative humidity range
21 15.2.2 Damage limited humidity range
16 Electrical signals at transducer terminals
16.1 Rated maximum input value
16.1.1 Conditions to be specified
16.1.2 Direct measurement
22 17 Electrical input power
17.1 Real input power
17.2 Power dissipated in DC resistance
23 17.3 Power dissipated in rated impedance
17.4 Rated maximum input power
18 Electrical input impedance
18.1 Complex electrical impedance
18.1.1 General
18.1.2 Method of measurements
24 18.2 Rated Impedance: characteristic to be specified
19 Vibration of the radiator surface
19.1 General
19.2 Displacement of a surface point rr
19.2.1 General
25 19.2.2 Method of measurements
19.3 Reference displacement
19.3.1 General
19.3.2 Methods of measurement
26 19.4 Peak and bottom displacement
19.4.1 General
19.4.2 Method of measurements
19.5 DC displacement
19.5.1 General
27 19.5.2 Method of measurements
19.6 Displacement transfer function
19.6.1 General
19.6.2 Method of measurements
19.7 Accumulated acceleration level
19.7.1 General
28 19.7.2 Method of measurements
20 Small-signal lumped parameters
20.1 General
Figure 2 ā€“ Equivalent electrical network representing the electrical input impedance using the LR2 model for the lossy inductance of an electro-dynamical transducer
29 20.2 Electrical parameters
20.2.1 General
20.2.2 DC resistance
20.2.3 Lossy inductance
30 20.2.4 Electrical representation of the fundamental resonator
20.3 Relative lumped parameters
20.3.1 General
31 20.3.2 Resonance frequency
20.3.3 Electrical quality factor
20.3.4 Mechanical quality factor
32 20.3.5 Total quality factor
Figure 3 ā€“ Analogous lumped parameter network representing the electrical, mechanical and acoustical elements at low frequencies
33 20.4 Lumped mechanical parameters
20.4.1 General
20.4.2 Method of measurements
36 20.5 Pure lumped mechanical parameters
20.5.1 General
20.5.2 Method of measurements
20.6 Compliance versus frequency
20.6.1 General
20.6.2 Method of measurements
37 20.7 Distributed mechanical parameters
20.7.1 Receptance
38 20.7.2 Modal analysis
20.7.3 Relative rocking level
39 20.7.4 Centre of gravity
Figure 4 ā€“ Asymmetrical mass distribution function DM(y,z0) in the mechanical system of a microspeaker that shifts the centre of gravity away from the pivot point
40 20.7.5 Centre of stiffness
20.7.6 Centre of force factor
41 20.8 Lumped acoustical parameters
20.8.1 Mechano-acoustical coupling function
20.8.2 Effective radiation area
42 20.8.3 Acoustical load impedance
43 20.8.4 Lumped parameters of a coupled resonator
Figure 5 ā€“ Equivalent electrical network of a transducer operated in a baffle represented by pure mechanical elements and additional acoustical elements
44 Figure 6 ā€“ Equivalent electrical network representing the electrical input impedance of a vented loudspeaker system
45 21 Electro-acoustical efficiency
21.1 Reference efficiency
21.1.1 General
21.1.2 Methods of measurement
46 21.2 Passband efficiency
21.2.1 General
21.2.2 Method of measurement
22 Sensitivity
22.1 Reference sensitivity
47 22.2 Passband sensitivity
23 Large-signal characteristics
23.1 Electrical and mechanical nonlinearities
23.1.1 Nonlinear stiffness KMS(x)
48 23.1.2 Nonlinear force factor
23.2 Other loudspeaker nonlinearities
23.3 Asymmetry of the nonlinearity
23.3.1 Stiffness asymmetry AK
49 23.3.2 Force factor asymmetry ABl
23.3.3 Force factor symmetry point xsym
50 23.4 Offset from reference rest position, xoff
23.4.1 General
23.4.2 Method of measurement
Figure 7 ā€“ Nonlinear force factor characteristic of an electro-dynamical transducer
51 23.5 Maximum reference displacement
23.5.1 Clearance to the boundaries
52 23.5.2 Mechanical limited peak displacement, Xmech
23.5.3 Distortion limited peak displacement, XMAXd
53 23.5.4 Compliance-limited displacement xC
23.5.5 Force-factor-limited displacement xBl
24 Thermal characteristics
24.1 General
24.2 Increase in voice coil temperature
24.2.1 General
54 24.2.2 Methods of measurement
24.3 Effective thermal resistance
24.3.1 General
24.3.2 Method of measurement
24.4 Thermal parameters
24.4.1 General
24.4.2 Method of measurement
55 24.5 Thermal time constant of the voice coil
24.5.1 General
24.5.2 Method of measurement
24.6 Thermal bypass factor
25 Time variance of the loudspeaker characteristics
25.1 Fatigue and load induced aging
25.1.1 General
56 25.1.2 Stiffness versus apparent work
25.1.3 Parameters of the load induced aging model
57 25.1.4 Stiffness versus ambient temperature
26 Measurement uncertainty
59 Annex A (informative)Practical application guide
Table A.1 ā€“ Important characteristics and their application
60 Bibliography

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BS EN IEC 60268-22:2020 2021
$198.66