GB/T 15173-2010 PDF English
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Electroacoustics - Sound calibrators
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Sound calibrators
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GB/T 15173-2010: Electroacoustics - Sound calibrators---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT15173-2010
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 17.140.50
A 59
GB/T 15173-2010 / IEC 60942.2003
Replacing GB/T 15173-1994
Electroacoustics -- Sound calibrators
(IEC 60942.2003, IDT)
Issued on: SEPTEMBER 02, 2010
Implemented on: APRIL 01, 2011
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 4
Introduction... 6
1 Scope... 7
2 Normative references... 7
3 Terms and definitions... 8
4 Reference environmental conditions... 10
5 Requirements... 10
5.1 General... 10
5.2 Sound pressure level... 13
Table 1 -- Tolerance limits for sound pressure level and short-term level fluctuation, at and
around reference environmental conditions... 14
Table 2 -- Tolerance limits for the effect of supply voltage on sound pressure level, under
reference environmental conditions... 14
5.3 Frequency... 15
Table 3 -- Tolerance limits for frequency, at and around reference environmental conditions 15
5.4 Influence of static pressure, air temperature and humidity... 15
Table 4 -- Tolerance limits for sound pressure level, over the specified range of environmental
conditions... 17
Table 5 -- Tolerance limits for frequency, over the specified rang e of environmental conditions
... 17
5.5 Total distortion... 17
Table 6 -- Maximum total distortion... 18
5.6 Power supply requirements... 18
5.7 Specification and calibration of microphones... 18
5.8 Electromagnetic compatibility... 19
6 Instrument marking and documentation... 20
6.1 Marking of the sound calibrator... 20
6.2 Individual calibration chart for a class LS sound calibrator... 21
6.3 Instruction manual... 21
Annex A (normative) Pattern evaluation tests... 24
A.0 Introduction... 24
A.1 Submission for test... 25
A.2 Principal values... 25
A.3 Marking of the sound calibrator and supplied documentation... 25
A.4 Performance tests at and around reference environmental conditions... 25
Table A.1 -- Maximum permitted expanded uncertainty of measurement for sound pressure
level and short-term level fluctuation, at and around reference environmental conditions... 29
Table A.2 -- Maximum permitted expanded uncertainty of measurement for frequency, at and
around reference environmental conditions... 31
Foreword
This Standard is a revision of GB/T 15173-1994 "Sound calibrators".
This Standard is equivalent to IEC 60942.2003 " Electroacoustics -- Sound calibrators"
(the third English edition).
For ease of use, this Standard has made the following editorial changes.
a) The decimal point "." is used instead of the comma "," as a decimal point;
b) The Foreword of IEC 60942.2003 is deleted;
c) The introductory words in the chapter of normative references are modified
according to the provisions of GB/T 1.1-2000.
This Standard replaces GB/T 15173-1994 "Sound calibrators".
Compared with GB/T 15173-1994, the main changes of this Standard are as follows.
a) Introduction is added;
b) The definitions of three terms such as nominal value, equivalent free field sound
pressure level and equivalent diffuse field sound pressure level are deleted
(3.2~3.3 of GB/T 15173-1994), and 12 terms such as specified sound pressure
level are added (3.2~3.13 of this Standard);
c) The class identification is changed from 0, 1 and 2 to LS, 1 and 2; the mark "L"
for restricted environmental conditions is deleted (4.3.4 of GB/T 15173-1994),
and the mark "C" for environmental impact correction is added (5.1.4 of this
Standard);
d) Reference environmental conditions are added (Chapter 4 of this Standard);
e) The range of working environment conditions is consistent with the provisions of
sound level meter (GB/T 3785.1-2010 (IEC61672-1.2002));
f) The tolerance includes the maximum permissible measurement uncertainty;
g) The requirements for sound pressure level within the power supply voltage range
are added (5.2.4 of this Standard);
h) The requirements for frequency stability are deleted (4.2.3 of GB/T 15173-1994);
i) The specifications for burst sound capability are deleted (4.5 of GB/T 15173-1994);
j) The specifications for microphone types used for level determination are added
(5.7.1 of this Standard);
Electroacoustics -- Sound calibrators
1 Scope
This Standard specifies the performance requirements for three classes of sound
calibrator. laboratory standard (class LS), class 1 and class 2.Tolerance limits are
smallest for class LS and greatest for class 2 instruments. Class LS sound calibrators
are normally used only in the laboratory; class 1 and class 2 are considered as sound
calibrators for field use. A class 1 sound calibrator is primarily intended for use with a
class 1 sound level meter and a class 2 sound calibrator primarily with a class 2 sound
level meter, as specified in IEC 61672.1.
The tolerance limits for class LS sound calibrators are based on the use of a laboratory
standard microphone, as specified in IEC 61094-1, for demonstrations of conformance
to the requirements of this Standard. The tolerance limits for class 1 and class 2 sound
calibrators are based on the use of a working standard microphone, as specified in GB/T
20441.4, for demonstrations of conformance to the requirements of this Standard.
A multi-level and multi-frequency sound calibrator has the same class designation for
all sound pressure level and frequency combinations for which the instruction manual
states that the instrument conforms to the requirements of this Standard.
This Standard does not include requirements for equivalent free-field or random-
incidence sound pressure levels, such as may be used in the overall sensitivity
adjustment of a sound level meter.
A sound calibrator may provide other functions, for example, tone bursts. Requirements
for these other functions are not included in this Standard.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 3785.1-2010, Electroacoustics -- Sound level meters -- Part 1.Specifications
(IEC 61672-1.2002, IDT)
GB/T 3240-1982, Preferred frequencies for the acoustical measurement (idt ISO
266.1975)
GB 9254-2008, Information technology equipment -- Radio disturbance
characteristics - Limits and methods of measurement (CISPR 22.2006, IDT)
GB/T 17626.2-2006, Electromagnetic compatibility (EMC) -- Testing and
measurement techniques -- Electrostatic discharge immunity test (IEC 61000-4-
2.2001, IDT)
GB/T 17799.1-1999, Electromagnetic compatibility -- Generic standards - Immunity
for residential, commercial and light-industrial environments (idt IEC 61000-6-
1.1997)
GB/T 17799.3-2001, Electromagnetic compatibility -- Generic standards Emission
standard for residential, commercial and light-industrial environments (idt
CISPR/IEC 61000-6-3.1996)
GB/T 20441.4-2006, Measurement microphones -- Part 4.Specifications for
working standard microphones (IEC 61094-4.1995, IDT)
ISO/IEC Guide.1995, Guide to the expression of uncertainty in measurement
ISO Publication.1993, ISBN 92-67-01075-1, International vocabulary of basic and
general terms in metrology
IEC 61094-1.2000, Measurement microphones -- Part 1.Specifications for
laboratory standard microphones
IEC 61094-2.1992, Measurement microphones -- Part 2.Primary method for
pressure calibration of laboratory standard microphones by the reciprocity
technique
IEC 61094-5.2001, Measurement microphones -- Part 5.Specifications for working
standard microphones
IEC 60050 (801).1994, International Electrotechnical Vocabulary (IEV) - Chapter
801.Acoustics and electroacoustics
IEC 61000-4-3.2002, Electromagnetic compatibility (EMC) -- Part 4-3.Testing and
measurement techniques -- Radiated, radio-frequency, electromagnetic field
immunity test. Basic EMC Publication
OIML International Recommendation R 97.1990, Barometers
3 Terms and definitions
For the purposes of this Standard, the definitions contained in IEC 60050 (801).1994
and the ISO Publication International vocabulary of basic and general terms in
metrology, as well as the following definitions, apply.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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