GB/T 15173-2010Electroacoustics - Sound calibrators (English PDF)

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.

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