Some standard content:
National Standard of the People's Republic of China
and calibration
Sound calihrators
This standard is equivalent to the international standard 1FC942 "Sound calibrators (first edition in 1988). 1 Subject content and scope of application
This standard specifies the product classification, technical requirements and marking of various sound calibrators. GB/T 15173-94
This standard applies to three levels of sound calibrators, namely, level 0, level 1 and level 2, arranged in descending order of accuracy under standard conditions. The sound calibrator is limited to use in a limited range of environmental cases and is distinguished by the mark \1". Note: The term "grade" indicates the accuracy of the sound calibrator, which is equivalent to the term "type" used in (GI3 3785). This standard does not involve the calibration technology of the sound calibrator itself, nor does it involve the calibration of any measuring device or system using the sound calibrator. 2 Reference standards
GB3240 Common frequencies in acoustic measurements
GB3785 Electrical and acoustic properties and test methods of sound level meters SJ/T 10444 Electroacoustics Terms
SI/Z91471EC327) Method for sound pressure calibration of 23.77mm standard condenser microphone using reciprocity technique SJ/Z9151 (IEC804) Integrating average sound level meter 3 Terms
Except for the following terms, the definitions of other terms used in this standard shall be in accordance with the provisions of SJ/T10444 and (H3785. 3.1 Sound calibrator
A device that can produce sinusoidal sound pressure of specified frequency and level when coupled with a microphone of specified model and shape, used to calibrate the sound sensitivity of the microphone. Adapters may be provided to accommodate a variety of microphone models. This standard stipulates that any such adapter should be an integral part of the calibrator.
3.2 Nominal value value
The sound pressure level value and/or sensitivity value that characterizes the characteristics of the sound calibrator specified by the manufacturer. It also refers to the value under the environmental conditions of atmospheric pressure of 101.3kPa, temperature of 20℃ and relative humidity of 65% when the sound calibrator is used with a microphone of a specific model and shape, after any stabilization time specified by the manufacturer. This value is valid for all sound calibrators of the same model, or for individual sound calibrators calibrated separately.
Note: In the specifications for the calibration of microphone sound pressure sensitivity, 23°C is widely used as the reference temperature. Therefore, the temperature of the microphone used must be taken into account when calibrating the sound calibrator.
3.3 Equivalent white-field sound pressure levelequivalentfrcufieldsoundpressurelevelUnder the standard conditions of atmospheric pressure, humidity and humidity specified in 3.2, with a flat wave at the same frequency as the working frequency of the sound calibrator: the sound pressure level that reaches the microphone at the specified reference direction of incidence. This sound pressure level causes the output voltage of a microphone of a specific shape or the indication of a given model of sound level meter to be the same as the value when the sound calibrator itself is used. Approved by the State Administration of Technical Supervision on August 20, 1994, and implemented on April 1, 1995
GB/T 15173—94
3.4 Equivalent diffuse-field sound pressure levelequivalentlifuse-field sound pressurelevelUnder the standard conditions of atmospheric pressure, temperature and humidity specified in 3.2, with a diffuse-field sound pressure level at the same frequency as the working frequency of the sound calibrator. This sound pressure level causes the output voltage of a microphone of a specific shape or the indication of a given model of sound level meter to be the same as the value when the sound calibrator itself is used.
Note: For the measurement of equivalent diffuse field sound pressure level, the step 4 described in Appendix B of GB 3785 may be used. Technical requirements
A sound calibrator that complies with this standard shall have the following characteristics. 4.1 Sound pressure level
4.1.1 Nominal value
When the sound calibrator is used on a microphone of specified model and shape, at least one of the sound pressure levels produced by the sound calibrator shall be not less than 90 dB (reference sound pressure is 20μPa). 4.1.2 Tolerance
Under the standard environmental conditions specified in Article 3.2, after the stabilization time specified by the manufacturer, the half-mean sound pressure level of the sound calibrator within 20 s shall not deviate from the corresponding nominal value when the sound calibrator is used with each specified model of microphone or sound level meter by more than the tolerance specified in Table 1.
Table 1 Tolerances and stability limits of sound levels
Sound calibrator level
Stability
4.1.3 Stability
After the stabilization time specified in the production, the fluctuation of the output sound pressure level relative to the average sound pressure level within 20 s determined in 4.1.2 and measured by time meter F (fast gear) shall not exceed the value in Table 1 Specified stability limits. 4.2 Frequency
4.2.1 Nominal value
The frequency generated by the sound calibrator shall be at least within the range of 160Hz to 1kHz (including 160IIz and 1kHz). It is recommended that all output frequencies be selected from the values specified in GB3240 for the 1/3 octave series. Note: When the sound calibrator is used as a supporting acoustic measurement device, the recommended operating frequency is 1Hz. 4.2.2 Tolerance
Under the standard environmental conditions specified in Article 3.2, and after the stabilization time specified by the manufacturer, the deviation between the average value of the acoustic signal epilepsy rate of the sound calibrator within 20 working hours and the corresponding nominal value shall not be greater than the tolerance specified in Table 2. Table 2 Tolerance and stability limits of output frequency Sound calibrator grade
Additional difference %
Stability. light
Note, when the sound calibrator is used to calibrate the A-weighted characteristic working device, if the frequency generated by the calibrator is not 1 kHz, these frequency tolerances will cause errors. In this case, the actual condensation rate of the sound calibrator must be known in order to estimate the influence of A weighting. 4.2.3 Stability
After the stabilization time specified by the manufacturer, the frequency of the sound calibrator is measured in a time window not exceeding 2 s in 4.2.2. The fluctuation of the relative frequency average value measured within 20 s of operation shall not exceed the stability limit specified in Table 2. 4.3 Influence of atmospheric pressure, temperature and humidity 4.3.1 Influence of atmospheric pressure
GB/T 15173 -- 94
When the atmospheric pressure changes within the range of 65~108kPa, if the sound pressure level produced by the sound calibrator at a temperature of 20°C and a relative humidity of 65% deviates from the nominal value by less than the tolerance specified in Table 1, the manufacturer must state and shall: a. Ask the user to provide data on the influence of atmospheric pressure in order to correct the sound pressure level produced by the sound calibrator; b. State the atmospheric pressure range within which the corrected sound pressure level is within the tolerance specified in Table 1, which shall not be less than 85~105kPa. c. State the maximum uncertainty of the atmospheric pressure measurement required to meet the requirements of the above 4.3.1.b is wide, in order to correct the influence of atmospheric pressure changes. When equipped with a barometer, its accuracy and scale should make the correction value of the sound pressure level within the pressure range specified in Article 4.3.1.b above, and within the tolerance specified in Table 1. 4.3.2 Effect of ambient temperature
In the ambient temperature range of -10 to +50°C, if the deviation of the sound pressure level produced by the sound calibrator under the conditions of atmospheric pressure of 101.3 kPa and relative humidity of 65% from the nominal value is greater than the tolerance specified in Table 1 or its frequency is greater than the tolerance specified in Table 1, the product standard provisions must be issued and the following should be made:
a Provide the user with data on the effect of ambient temperature so as to correct the sound pressure level value and/or frequency value produced by the sound calibrator; b. c. State the ambient temperature range, within which the sound pressure level and frequency values after domestic correction F shall be within the tolerances specified in Table 1 and Table 2 respectively. This temperature range shall not be less than 5-35°C. c. State the maximum uncertainty of the ambient temperature measurement value that meets the requirements of Article 4.3.2.b above. In order to facilitate the correction of the influence of ambient temperature changes, when the thermometer is provided with the sound calibrator, its accuracy and scale shall make the corrected value of the sound pressure level within the temperature range specified in Article 4.3.2.b above, all within the tolerances specified in Table 1. When the sound calibrator is driven by a battery, the temperature range within which the sound calibrator operates within the tolerance will be limited by the performance of the battery itself. In this case, the manufacturer shall specify the working temperature and provide detailed instructions on how to connect the sound calibrator to the external power supply and the voltage and current requirements.
4.3.3 Impact of environmental humidity
When the relative humidity varies from 10% to 90°C, the sound pressure level or frequency value produced by the sound calibrator at an atmospheric pressure of 11.3 kP and a temperature of 20°C deviates from the nominal value by more than the tolerances specified in Table 1 and Table 2, the humidity range that meets the tolerance must be specified by the manufacturer, which is at least 30% to 80%. 4.3.4 Marking "L"
In the case of an atmospheric pressure range of 85 to 105 kPa, an ambient temperature of 5 to 35 °C, or an ambient relative humidity of 30% to 80%, if the technically corrected sound pressure level and frequency values do not meet the requirements of Table 1 and Table 2, the letter "L" shall be marked immediately after the grade name of the sound calibrator, and the limited environmental conditions shall be indicated. Note: The sound calibrator marked with "L" indicates that it is intended to operate in a narrower range of environmental conditions than the sound level meter limits marked with \.\ specified in GE3785 and be used in the laboratory.
4.4 Harmonic distortion
The total harmonic distortion of sinusoidal sound pressure should not exceed 3 % . 4.5 Pronunciation capability
4.5.1 The sound calibrator may be equipped with a burst tone capability or a timing device. When equipped with this capability, the manufacturer shall state the nominal values of the duration of the tone and the time interval between tone. The deviation between the actual value and the nominal value of the duration of the itchy sound and the time interval between the burst sounds shall not be greater than 2 steps.
4.5.2 Other requirements
If the burst sound capability is sufficient to provide verification of the effective value characteristics of the sound level meter, it must comply with 4.4.5.1 of (3785). If it is to provide verification of the pulse processing capability of the average sound level meter, it must comply with 9.3.4 of SI/Z9151 (IEC:804). 4.6 Battery requirements Www.bzxZ.net
If the sound calibrator is battery-powered, the manufacturer should provide a method for checking the battery as an integral part of the method for correct use of the calibrator so that there is sufficient battery voltage to enable the calibrator to operate in accordance with the requirements of this standard. When the battery voltage drops to low" Sound calibrator GB/T15173--94 ||tt ||When the minimum voltage required for operation is pushed according to the wooden mark, there should be a prompt or it should be ensured that the sound calibrator stops generating any sound output. The preferred battery type should be stated and marked as close to the battery box as possible. 4.7 Specification of microphone type
4.7.1 Microphone type and adapter
The manufacturer of the sound calibrator should state the brand, model and appearance of the microphones or sound level meter units that the sound calibrator that complies with this standard is intended to serve. At the same time, the structure of the required adapter should be specified, and the nominal sound pressure level generated by the microphone at . should be marked with a resolution of not less than .1dB.
Note: In order to avoid confusion, it is recommended that the adapter be designed so that its nominal sound pressure is independent of the microphone model. 4.7.2 Moisture-induced
Microphones should be of the two types specified below For models, a. it shall be capable of being calibrated in accordance with S1/7.9147 (IEC327) b. it shall be capable of being directly compared with a microphone calibrated in accordance with SJ/Z9147 (IEC.327). In this case, the manufacturer shall specify the comparison method used.
Note: If only equivalent self-field or equivalent diffuse field sound pressure level is used to calibrate the sound calibrator, the above requirements will no longer apply. 4.8 Other responses
The electrostatic or electromagnetic fields radiated by the sound calibrator and the mechanical vibrations generated should be sufficiently small so that when it works with any given type of microphone, the additional output of the sound calibrator can be ignored compared to the difference specified in Table 1. Note: For motor-driven sound calibrators, the impact of motor excitation varies greatly for different types of microphones and is related to the orientation of the microphone relative to the driver. || tt||5 Marking and product manual
5.1 Marking of sound calibrator
Sound calibrators that comply with this standard shall provide the following information, of which the ad bar must be marked on the sound calibrator: a. The manufacturer's name or trademark; b. The model name, serial number and production date of the product; c. The number and publication date of this standard; d. The sound pressure level, and the letter "+" that may be used: one or more nominal values of the sound pressure level produced (if different values are used for different types of microphones or for different structures of the microphones used, the nominal sound pressure level indicated should be appropriately explained); f. One or more frequencies produced; g. If the sound pressure level produced is related to the orientation of the sound calibrator, the preferred method should be indicated: h4. 3.1 and 4.3.2, and the correction data; i. give, where appropriate, the nominal values of the equivalent free-field and/or diffuse-field sound positive levels, and the type of sound level meter to which these values apply. If adapters are provided, the model name shall be clearly marked on them. If an adapter supplied for one model of commercial calibrator is in fact capable of being used with another model of sound calibrator having the same manufacturer's trade name (although it is not intended to be used in this way), each adapter shall bear sufficient identification markings to avoid accidental misuse. 5.2 Product manual
The sound calibrator shall be provided with a product manual which contains at least the information required by all the clauses of Chapter 1 and 5.1. In addition, it shall include the following information:
a. A complete description of the type and shape of the microphone for which the sound calibrator is intended to operate and the corresponding adapter required, in order to ensure that the sound calibrator can be used to meet the detailed requirements of this standard: h. Stabilization time before the acoustic output reaches the specified sound pressure level (if required) tCB/T 15173-94
c. Temperature and humidity limits that may cause permanent damage to the calibrator; d. Changes in the sound pressure level produced by the calibrator due to the equivalent volume of the microphone or the overall change in the equivalent volume after the microphone is connected:
e. Other available battery models,
f. If none of the specified microphone models can be calibrated according to SJ/29147 (IEC327), at least one of the specified microphone models must be able to be directly compared with a microphone calibrated according to SI/Z9147 (IEC327) (see 4.7.2 above)
g. Limits on the operating temperature range of the recommended battery model (see 4.3.2), and detailed instructions on how to connect the external power supply. Additional notes:
This standard is proposed by the State Administration of Technical Supervision. This standard was drafted by the National Electroacoustic and Audiovisual Equipment Standardization Committee. This standard was drafted by the China Academy of Computer Science and Technology and Changzhou Metrology and Testing Technology Research Institute. The main drafters of this standard are Wang Hanji, Zhu Xiaojun, Chen Jianji, and Zhou Yuming.327) calibrated microphone, in which case the manufacturer shall specify the comparison method used.
Note: If the sound calibrator is calibrated only by equivalent self-field or equivalent diffuse field sound pressure level, the above requirements will no longer apply. 4.8 Other effects
The electrostatic field or electromagnetic field radiated by the sound calibrator and the mechanical vibration generated should be small enough so that when it works with any given type of microphone, the additional output of the sound calibrator can be ignored compared with the difference specified in Table 1. Note: For motor-driven sound calibrators, the impact of motor excitation varies greatly for different types of microphones and is related to the orientation of the microphone relative to the driver.
5 Marking and product instructions
5.1 Marking of sound calibrators
Sound calibrators that comply with this standard shall provide the following information, of which the ad bar must be marked on the sound calibrator: a. The manufacturer's name or trademark;
b. The model name, number and production date of the product: c. Number and date of publication of this standard:
Higgs scale, and possibly the letter "+": one or more nominal values of the sound pressure level produced (if different values are used for different types of microphones or for different structures of microphones used, the nominal sound pressure level indicated should be appropriately stated), f. one or more frequencies produced,
g. If the sound pressure level produced is related to the orientation of the sound calibrator, the preferred method should be indicated: h4. 3. 1 and 4. 3. 2 i. give, where appropriate, the nominal values of the equivalent free-field and/or diffuse-field sound levels and the type of sound level meter to which these values apply. If adapters are provided, the model name shall be clearly marked on them. If an adapter supplied for a commercial calibrator of one model can in fact be used for another model of sound calibrator with the same manufacturer's trade name (although it is not intended to be used in this way), each adapter shall carry sufficient identification markings to avoid accidental misuse. 5.2 Product manual
The sound calibrator shall be provided with a product manual which contains at least the information required by all clauses of Chapter 1 and clause 5.1. In addition, it shall include the following information:
a. A complete description of the type and shape of the microphone for which the sound calibrator is intended to operate and the corresponding adapter required to ensure that the sound calibrator can be used to meet the requirements of this standard. The detailed specifications are: h. The stabilization time (if required) before the sound output value reaches the specified sound pressure level value tCB/T 15173—94
c. Temperature and humidity limits that may cause permanent damage to the calibrator; d. Changes in the sound pressure level produced by the calibrator due to the equivalent volume of the microphone or the overall change in the equivalent volume after the microphone is connected:
e. Other battery models available,
f. If none of the specified microphone models can be calibrated in accordance with SJ/29147 (IEC327), at least one of the specified microphone models must be calibrated in accordance with SI/Z914 7 (IEC327) calibrated microphones for direct comparison (see 4.7.2 above)
g. The operating temperature range limits of the recommended battery models (see 4.3.2), as well as detailed instructions on how to connect the external power supply. Additional notes:
This standard was proposed by the State Administration of Technical Supervision. This standard was drafted by the National Electroacoustic and Audiovisual Equipment Standardization Committee. This standard was drafted by the China Academy of Basic Science and Changzhou Metrology and Testing Technology Research Institute. The main drafters of this standard are Wang Hanji, Zhu Xiaojun, Chen Jianji, and Zhou Yuming.327) calibrated microphone, in which case the manufacturer shall specify the comparison method used.
Note: If the sound calibrator is calibrated only by equivalent self-field or equivalent diffuse field sound pressure level, the above requirements will no longer apply. 4.8 Other effects
The electrostatic field or electromagnetic field radiated by the sound calibrator and the mechanical vibration generated should be small enough so that when it works with any given type of microphone, the additional output of the sound calibrator can be ignored compared with the difference specified in Table 1. Note: For motor-driven sound calibrators, the impact of motor excitation varies greatly for different types of microphones and is related to the orientation of the microphone relative to the driver.
5 Marking and product instructions
5.1 Marking of sound calibrators
Sound calibrators that comply with this standard shall provide the following information, of which the ad bar must be marked on the sound calibrator: a. The manufacturer's name or trademark;
b. The model name, number and production date of the product: c. Number and date of publication of this standard:
Higgs scale, and possibly the letter "+": one or more nominal values of the sound pressure level produced (if different values are used for different types of microphones or for different structures of microphones used, the nominal sound pressure level indicated should be appropriately stated), f. one or more frequencies produced,
g. If the sound pressure level produced is related to the orientation of the sound calibrator, the preferred method should be indicated: h4. 3. 1 and 4. 3. 2 i. give, where appropriate, the nominal values of the equivalent free-field and/or diffuse-field sound levels and the type of sound level meter to which these values apply. If adapters are provided, the model name shall be clearly marked on them. If an adapter supplied for a commercial calibrator of one model can in fact be used for another model of sound calibrator with the same manufacturer's trade name (although it is not intended to be used in this way), each adapter shall carry sufficient identification markings to avoid accidental misuse. 5.2 Product manual
The sound calibrator shall be provided with a product manual which contains at least the information required by all clauses of Chapter 1 and clause 5.1. In addition, it shall include the following information:
a. A complete description of the type and shape of the microphone for which the sound calibrator is intended to operate and the corresponding adapter required to ensure that the sound calibrator can be used to meet the requirements of this standard. The detailed specifications are: h. The stabilization time (if required) before the sound output value reaches the specified sound pressure level value tCB/T 15173—94
c. Temperature and humidity limits that may cause permanent damage to the calibrator; d. Changes in the sound pressure level produced by the calibrator due to the equivalent volume of the microphone or the overall change in the equivalent volume after the microphone is connected:
e. Other battery models available,
f. If none of the specified microphone models can be calibrated in accordance with SJ/29147 (IEC327), at least one of the specified microphone models must be calibrated in accordance with SI/Z914 7 (IEC327) calibrated microphones for direct comparison (see 4.7.2 above)
g. The operating temperature range limits of the recommended battery models (see 4.3.2), as well as detailed instructions on how to connect the external power supply. Additional notes:
This standard was proposed by the State Administration of Technical Supervision. This standard was drafted by the National Electroacoustic and Audiovisual Equipment Standardization Committee. This standard was drafted by the China Academy of Basic Science and Changzhou Metrology and Testing Technology Research Institute. The main drafters of this standard are Wang Hanji, Zhu Xiaojun, Chen Jianji, and Zhou Yuming.
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