GB/T 4214.1-2000 Acoustics - Test methods for noise from electrical appliances and similar appliances - Part 1: General requirements
Some standard content:
CB/T 4214-1 2000
This standard is a revision of GB/T4214-19841 based on the international standard IEC607041:1997 Household appliances and similar appliances - Noise test method Part 1: General requirements. This standard is equivalent to the international standard in terms of technical content. As there are many types of household appliances, and new uses and types of products will appear in the future, it is not only very laborious to formulate a separate noise test standard for each product, but also the standard system itself will appear chaotic. Therefore, IEC60701-1:1997 adopts the following method, that is, the noise test standard for household appliances is divided into two parts. The first part is the general requirements, which is applicable to all appliances, and the second part is the special requirements part, which is formulated for a certain product (such as washing machine). The second part can be formulated on the basis of the first part through the addition, deletion, substitution, application and other methods. Therefore, the combination of Part 1 and Part 2 constitutes a complete noise test standard for certain appliances. This standard adopts this formulation method. This standard is the first part of the series of standards for noise test methods for old electrical appliances and similar purpose appliances. This standard will take effect from the date of entry into force. At the same time, it will replace P/T 4214-1984. The reference A of this standard is the appendix of the standard. The unit proposing this standard is the Chinese Academy of Sciences. The national technical committee for acoustic standardization is the responsible unit of the standard. The drafting unit of this standard is China Household Electrical Appliance Research Institute, Guangzhou Electrical Science Research Institute. The main drafters of this standard are Chang Weicheng and Xu Qingfang. This standard was first issued on March 21, 1984. GB/T 4214-12000
IEC Foreword
1) The International Electrotechnical Commission (IFC) is a world-wide standardization federation composed of all national electrotechnical committees (IEC National Committees) to promote international cooperation on standardization issues in the electrical and electronic fields. To achieve this: 1) IEC publishes relevant international standards and entrusts technical committees with the responsibility of developing these standards. Any IEC National Committee has the right to participate in the preparation of a standard when it is interested in it. Governmental and non-governmental international organizations in contact with the IFC may also participate in this work. The International Electrotechnical Commission (IEC) maintains close cooperation with the International Organization for Standardization (ISO) in all aspects of the agreement reached between the parties. 2) Each technical committee represents all interested national committees. Therefore, the formal decisions or agreements of the International Electrotechnical Commission (IEC) on technical issues should, as far as possible, express the consensus opinion within the international scope of the above-mentioned subject. 3) These decisions or agreements are recommended for use internationally in the form of standards, technical reports and specifications, and in this sense, have been accepted by all national committees. 4) In order to promote international unification, it is recommended that all national committees, within the scope of their conditions, should, as far as possible, use IEC texts as their national standards. Any differences between corresponding IEC standards and between national standards shall be pointed out in the corresponding standards.
The international standard was prepared by [Technical Committee EC59: Household electrical appliances The text of this standard is based on the following documents:
Final Draft International Standard (FDIS)
59/162/FDIS
.
Voting Report
59/173/RVI
The above voting report lists the voting results for the approval of this standard. Annex A of this standard is the appendix to the standard,
GB/T 4214. 1-2000
Although the noise emitted by household appliances will not cause hearing loss to users and other people present, it has long been recognized that there is a need to develop a unified standardized method for measuring the noise emitted by them. This method can not only be applied to most common types of appliances, but also to special types of appliances.
Generally speaking, the determination of the noise level of household appliances is part of its comprehensive performance test, and may also include many other aspects of the appliance's performance. Therefore, the requirements for noise testing (such as test environment, test instruments, and related standards) should be formulated as a relatively moderate level. The results of noise testing can be obtained in many ways, such as calibration of appliance noise and comparison of the noise level of a specific appliance with that of other household appliances. At the same time, these results can be used as the basis for the development stage of new products or for deciding on noise reduction measures. Regardless of the purpose, it is important to use standard test methods with known accuracy to make the test results obtained by different laboratories comparable. These conditions have been taken into consideration as much as possible during the formulation of this standard. The test methods of this standard are based on the relevant contents of (B/I3767, JS) 3743-1 and ISO3743-2.
The test environments that can be used with these methods include semi-anechoic chambers, special reverberation chambers, and test chambers with some surfaces. The test result is the sound power level of the appliance. These methods are within the uncertainty range specified in the standard, and the results obtained under free-field conditions above a reflecting surface are equivalent to those obtained in the sound field. In addition, the use of the clear strength method described in GB/T16404 and GB/T1640.3 is being considered. It should be emphasized that this test standard is related to air noise testing. Others such as structure-borne sound and its transmission are not covered by this standard. National Standard of the People's Republic of China
Acoustics-Household and similar electrical appliancesTest code for determination of noise from airhnrne aeaustical noisePart 1:General reguirements
1 Scope and objects
1.1 Scope of application
1.1.1 Overview
GB/T 4214. 1—2000
cqv IEC 60704-1: 1997
Generation G5/T -12:1—1981
The general requirements (Part 1) of this standard apply to: Household and similar electrical appliances, including their accessories and components, which are powered by the mains or batteries.
If not specifically stated in the second part of the special requirements, similar use can be understood as use under conditions similar to the home environment, such as in hotels, coffee shops, barber shops, beauty salons, laundry rooms, etc. This standard does not apply to;
1: Appliances, devices or equipment designed specifically for industrial use;
1: Appliances installed as an integral part of a building, such as air conditioning appliances, heating appliances, ventilators, heating oil heaters, water pumps for water supply and drainage systems;
Separate electric or electric:
1.1.2 Noise Types
JS0)12001 classifies different noises. The methods listed in B/T3767 are applicable to the measurement of noise of various electrical appliances in the home. The methods listed in IS3743-1 and IS(37432 are applicable to all kinds of noise except impulse noise. This will be specified in the formulation of special requirements.
1.1.3 Size of sound source
GB/T37571 new method is used to specify the size of the sound source. 1.8.2 of IS(3743-1) and IS(37432 gives the limit of the size of the sound source. This will be specified in the formulation of special requirements. 1.2 Quantitative
This standard gives the measurement method of the level of noise emitted by the measured instrument under specified operating conditions: the test quantity is the sound power level L in dB. The reference quantity is pW), and the frequency range is usually multiples of the center frequency [251z to Hz]. The following parameters will be used:
-A weighted sound power level Lw
-Odd-frequency sound power level,
The method described in this standard generally refers to the case where the test operator is not present. For equipment that must be operated or fed by someone, it will be explained in the special requirements.
National Quality and Technical Supervision Bureau 200003:16 approved 2000-12-01 implementation
GB/T4214.1-2090
Precision method for determining sound power level (according to 1201-2001) The method described in GB/6881 and GB/T6882 is not included in the list described in this standard, but if the test environment and instruments do not meet the requirements, it can be applied. Note: The sound value measured under the conditions described in the general requirements of this standard may not be consistent with the sound value obtained under actual application conditions. For quality control in the production process, simplified measurement methods can be used. Based on the product quality, narrow band frequency potential analysis or sound intensity technology should be used. These alternative methods are not within the scope of this standard. 1.3 Measurement uncertainty
The estimated values of the reproducibility standard deviation of the sound power concentration level measured according to this standard have been given in 1. of 1S)3743-1 and 1. of 5S)3713-2. However, for a specific series of instruments with the same size and the same operating environment, the reproducibility standard deviation may be less than these values. Therefore, if the test results of different laboratories show that the standard deviation is less than the value specified in the S standard, it can be stated in the special requirements part of this standard.
1FC704-3 provides the reproducibility standard deviation values of various instruments. If the measurement results of different measurements of the same instrument are inconsistent and seem to be within the predetermined standard deviation, the precision level method specified in GB/T5881 or GB/T6882 should be used for measurement. 2 Reference standards
The provisions contained in the following references constitute the provisions of this standard by reference in this standard: When this standard was published, the versions shown were valid. All standards have been revised. Parties using this standard should explore the possibility of using the latest version of the following references. GB/T 324I—1995
Fractional-octave-band and fractional-octave-band filters
Acoustics-bed method for determination of sound power level of noise sources-One-pass method for approximate white field above reflecting surfaceGB/T 3767- 1996
GB/T 3785 -1983
GB/T A129 1995
Acoustic performance test method for level meter-Standard for determination of sound power level of acoustic noise sources-Performance requirements and calibration of sound sources-Determination of sound power level of sound sources-Precision method in reverberation chambersGB/T 6881-1986
Determination of sound power level of sound sources-Precision method in anechoic chambers and anechoic chambersG15/R 6882- 1986
GB/T 17181-1997
Integrating average sound level meter
1SQ3743-1:1904
Acoustics - Determination of sound power level of noise sources - Method for small and movable sound sources in reverberation chambers - Part 1: Comparison method in test chambers with brushless walls Acoustics - Determination of sound power level of a sound source - Method for small and movable sound sources in reverberation chambers - Part 2 IS0 3713-2:19917
Part 2: Method in special reverberation chambers
Acoustics - Noise emitted by devices and equipment - Development and submission of noise test procedures IS0 12001.1906 7
1EC704-3:1992 Noise measurement for household treadmills and similar purposes - Part 1: Measurement and verification procedure for nominal noise emission levels
3 Terms and definitions
This standard uses the following definitions:
3.1 Terms and definitions related to the determination of average sound power level: see GB/T3767, ISO3743-1, ISO3743-23.2 Measurement period The period or stages of operation or the duration of operation during which the sound power level is to be measured; 3.3 Operation period The period of time taken by the measured device to complete a specific function (such as cleaning, rinsing or washing of a washing machine); 3.4 Operation cycle The time required for the measured device to complete a complete working process. In the operating cycle, each operating stage is related to a specific reverse process, which may occur only once, or repeatedly (such as washing, rinsing and drying in a dishwasher). 3.5 Time history
The continuous record of the pressure level at the microphone position as a function of time obtained during one or more reverse stages of a complete operating cycle:
GB/T 4214-1---2000
3.6 Standard test operatorstandard test operator is the person who operates the test instrument or performs the feeding. The standard test operator shall not wear clothing with obvious sound absorption characteristics to avoid affecting the test results.
3.7 Center of lacation or position of a sound source source This term is used to describe the location of the sound source (device) under test in the test environment and its orientation relative to the microphone position calibration system in a free field environment. For handheld, portable or stand-mounted devices, the center of the positioning coincides with the center of the reference body of the enclosing device. For floor-standing or wall-mounted devices, the center of the positioning coincides with the center of the rectangular projection of the reference body of the enclosing device on the ground (for wall-mounted devices, it means the projection of the wall). 3.8 Background noise correction K, bnckkroundnoiae torrcclin This correction value is used to indicate the effect of back noise on the acoustic level of the specified position of the measured machine: K, related to frequency. Unit dB, A-weighted correction item KA is obtained by taking the A-weighted value, 3-9 Environmental correction value K, enviranmenialinelicaton This correction value is used to indicate the effect of acoustic reflection or absorption on the surface acoustic level, related to frequency, unit 3. In the case of A-weighted, it is indicated by - (see GB/T3767GB/T3768) -4 Measurement method and acoustic environment Environment
4.1 Overview
The noise emitted by a machine or device and transmitted to the surrounding environment can be described by sound power. Generally speaking, the sound power of a device is closely related to the acoustic environment in which it is located. Therefore, when selecting the sound power level to express the limit of noise emitted by household appliances and similar appliances, the preferred noise emission level is the A-weighted sound power level, which is based on B (base unit is W). There are two basic test methods in this standard, namely the white pressure method and the theoretical comparison method, see 4.2 and 4.3. The two can be interchangeable. The environmental conditions applicable to this standard are See 4.1. For the purpose of appending, only one or a combination of several environments are used in the special requirements of the standard.
4.2 Direct method
Using this method: the power level is determined by the physical defect: for the approximate conditions of the reflective surface, the time-averaged sound pressure level on the surface is measured by measuring the surface area; in the special reverberation case, the average pressure level, reverberation time and test case volume are directly calculated from the measured sound pressure level and expressed as A-weighted sound power level (if necessary, in octave band power level).
Also: This method can also be combined with a more accurate method, see GB/T6861. GB/T6882 and ISC>3742.4.3 Comparison method
The comparison method has been clearly stated in IS13743-1 and IS03743-2. According to the requirements of B/429, this method measures the power level of the chip by comparing the average value of the sound pressure level generated by the sound source in the test room with the average value of the sound pressure level generated by the calibrated standard sound source (RSS) in the same test room with known chip power output. The result measured by this method is the power level of the octave band. The power level is calculated from the octave band sound power level. In order to check whether there is a systematic error in the test collection under different test environments, it is recommended to use the comparison method. 4.4 Acoustic environment
4.4.1 General requirements and evaluation of test environment
GB/T3767.1 provides the requirements and evaluation of the near-self-electromagnetic field environment of the reflective surface. 1S) 3743-1 provides the requirements and evaluation of the rigid surface test. ISO3743-2. gives the requirements and evaluation of special reverberation rooms. Note: For the near-inverse time, the absolute comparison test method described in Appendix A of G3.3757--IS is recommended to evaluate the acoustic environment and the design guide of special reverberation rooms. Appendix A of ISO3743-2. 4-4.2 Requirements for background noise GB/T 4214. 1-2000 Requirements for background noise can be found in Chapter 4 of ISO3743-11 ISO3743-2 and G3/T3767-1906. The background noise level should be at least 6 dB lower than the average level at each microphone position, preferably at least 15 dB lower than the measured sound level. Note: If the background noise is less than 6 dB higher than the instrument or sound level, refer to 8.1. 4.4.3 Environmental conditions
When there are adverse environmental conditions that have an adverse effect on the microphone (such as strong magnetic fields, wind, impact of the exhaust gas from the device, high and low temperatures), they should be avoided by selecting appropriate microphones and microphone positions. When using, the manufacturer's instructions on unmeasured environmental conditions should be followed. The direction of the sound wave incident angle when the microphone is calibrated should be the same as that of the measured environmental conditions.
5 Measuring instruments
5.1 Measuring instruments
For the requirements of instrument systems and their calibration, see IS () 3713-1.Chapter 5 of ISO 3713-2 GB/T3767-1996 states that the test instrument shall comply with the requirements for "type instruments" in GR/T3785 and GB/T17181. For octave band measurement or testing, the instrument shall comply with the requirements of GB/1321. The standard sound source (RSS) shall comply with the requirements of GB/T4219 and be calibrated annually. 5.2 Instruments for measuring climatic conditions 5.2.1 Temperature is measured with an instrument with an accuracy of ±1°C. 5.2.2 Relative humidity is measured with an instrument with an absolute accuracy of ±2°C. 5.3 Instruments for measuring operating conditions
5.3.1 For devices powered by electricity, the voltage of the cable or power cord plug is measured with a voltmeter with an accuracy of 0.1%. 5.3.2 For devices powered by batteries, the voltage of the battery is measured with a voltmeter with an accuracy of 0.5%. 5.3.3 The speed of the engine, accessories and other equipment is measured with a tachometer with an accuracy of -1%. 6 Operation and positioning of the device under test
6. 1 Equipment configuration and pretreatment
6.1.1 The equipment shall be installed with the accessories and parts with the designed purpose and function provided by the manufacturer when it is delivered. 6.1.2 The auxiliary equipment necessary for the operation of the equipment (such as cable pipes or relays, drainage or water supply pipes, exhaust joints, etc.) shall be ensured not to radiate a large amount of sound energy or change the radiation to the test environment. For the whole radiation, refer to ISO3743-1.1, ISO37432 and 6.4 of GB/T3767-996
6.1 .3 Before measurement, the device under test should go through a sufficiently long running-in period to prevent abnormal noise caused by the poor running-in of certain parts. If necessary, it should be run at the highest speed. Unless otherwise specified, it is generally not loaded. The user should specify the running-in period and rated operating time in the special requirements section. If the manufacturer has other instructions, it should be operated in accordance with the manufacturer's instructions. 6.1.4 Before measurement, the device under test should be running stably at the highest speed. Unless otherwise specified, it is generally not loaded. Otherwise, it should be measured in the special requirements section of the standard. 6.2 Electricity, water or gas supply
6.2.1 Equipment with AC/DC motors (maintenance) shall be supplied with rated voltage with a tolerance of ±1%, and shall be supplied at rated frequency. Equipment designed for DC shall be supplied with AC: equipment without rated frequency shall be supplied at 50Hz with a tolerance of 1. Equipment within the specified range of use shall be supplied with an average medium voltage within the range. If the range limits do not exceed 10% of the average voltage within the range, the tolerance shall be the same as specified above. If the difference exceeds 10%, the appliance is supplied with the highest voltage within the range. The tolerance is opposite to that specified above: the supply voltage shall be measured at the plug of the non-detachable cable or cord. When equipped with a detachable power cord, the measurement shall be made at the power cord terminals and not at the ends of external extension cables or cords. Note: Additional measurements are required when the rated voltage/frequency of the appliance is different from the voltage/frequency of the mains. The test shall be carried out at the rated voltage/frequency of the appliance. In this case, additional tests are necessary. If the test voltage/frequency is different from the rated voltage/frequency, the test shall be carried out in accordance with CB/T 4214.12000
6.2.2 For noise measurement, for battery-powered appliances, a battery with sufficient capacity specified by the manufacturer shall be used. After the appliance has been loaded and operated for a period of time, the battery capacity shall be reduced to a certain extent (<10% for nominal batteries: % for other batteries). The battery voltage shall be measured at the battery terminals.
6.2.3 Appliances that are heated by electricity or gas may be operated without heating if the heating does not affect the noise emission of the appliance. 6.2.4 The supply of water and/or gas shall be carried out in accordance with the manufacturer's specifications. If the manufacturer specifies, the water supply pressure shall be 24CkPa ± 50kPa. The cold water temperature shall be 15℃ ± 2℃. The hot water temperature shall be 55℃ ± 2℃, otherwise it shall be specified in the special requirements of the standard. Note: When the water pressure/temperature of the appliance is different from the water supply pressure/temperature of the market, additional measurements may be required. If the test pressure/temperature is different from the rated condensing pressure and temperature, it shall be noted in the test report. 6.3 Climatic conditions
Except where there are special provisions, household energy meters are generally operated and measured under the following environmental conditions: Ambient temperature
Relative astringency
Atmospheric air
1- 20℃ ±5\C
RH-30%±20%
P 96 kP= = 10 kPa
6.4 Loading and operating conditions of the instrument during the test
For the general requirements, please refer to 1SC3743-1.1S(）37+3-2 and 6.5 of GB/T3767-1996. Unless otherwise specified in the special points of this standard, the following principles should be observed:
6.4.1 The loading and operating conditions of the instrument should simulate its actual use as much as possible and should be repeatable and reproducible. Except for instruments that must be operated or fed by a test operator to be tested, the presence of a test operator should be avoided as much as possible. 6.4.2 If not specified in the Special Requirements section, the loading and operating conditions should be limited to a single condition. For multi-purpose or multi-functional instruments, a single condition may be used.
If the no-load condition is typical and stable, and the reproducibility of the loaded condition is very close, the loaded condition may be selected as the single condition for measuring the emitted noise of the instrument.
For instruments provided with speed control, the test should be carried out under the maximum speed control condition. 6.4.3 Operate the instrument during the normal operation phase and measure the emitted noise of the instrument at an appropriate stage of the active power operation phase. Measure at one of the measuring points, preferably at the measuring point before the instrument, and record the time-dependent change of the sound pressure level during the operation phase. 6.4.4 Noise test When selecting the instrument loading and operating conditions, pay attention to avoid overheating of the instrument under test. The manufacturer shall comply with the provisions of the manufacturer for the equipment when it is working/stopping.
6.5 Position and installation of the equipment
The equipment shall comply with the requirements of 6.1 to 6.3 of 1S3713-7, IS) 37432 and (R/T3767--1996: Unless otherwise specified in the special requirements, the following shall be met:
6.5-1 Floor-standing equipment, built-in equipment or desktop equipment shall be placed directly in the normal working position. In addition to the requirements of the equipment itself, no additional vibration isolation measures shall be taken. Its positioning shall comply with: When testing in a rigid wall test room or a special wet test room, the equipment to be tested shall be placed on the floor of the rigid wall test room or special filter room, and the minimum distance between any long side of the equipment (including the protruding part) and the nearest wall is !m. For an environment similar to the self-field above the reflective surface, the equipment to be tested shall be placed on the reflective surface, and the shape and size of the surface to be tested shall be considered. For vertical equipment (such as the equipment installed in the factory), the equipment to be tested shall be placed on the reflective surface. Equipment designed to be used on a stand, such as a hair drying hood, should be placed on a stand supplied with the equipment or mounted on a stand specified in the manufacturer's instructions. Note: Acoustic radiation from the movement of floor coverings must be prevented. Floor coverings should be considered as part of the equipment under test and their effect on the acoustic properties of the test loop should be considered. For table-top equipment, they should be installed in the center of the standard test table during the test. The requirements and structure of the standard test table are given in the appendix of the technical standard. 6.5.2 Hand-held equipment, including its accessories, if necessary, should be elastically suspended or elastically mounted on a stand at a height of about 25 cm that meets the measurement requirements. The bottom of the test fixture should be placed on an elastic medium and should not affect the noise emitted by the equipment under test. At the same time, structural vibrations should not be transmitted outside the test area. Its positioning should avoid: GB/F 4214.1--: 2000
For test chambers with rigid walls or special reverberation chambers, the instrument under test and the fixing bracket shall be installed on the test floor. The minimum distance between any surface of the instrument (including protruding parts) and the nearest wall is 1 m2. For an approximately white field environment above a reflecting surface, the instrument under test and the fixing bracket shall be placed on the reflecting surface, and the shape and size of the measuring surface shall be taken into consideration.
Note: It should be noted that the overall mounting should not affect the emission of the instrument's sound, for example, by radiating through the ground, suppressing or emitting vibrations of certain modes when clamped. The cover of the instrument's sound radiating surface and fixing bracket will change the generated radiation itself. 6.5.3 For floor-standing instruments placed end-to-end, including embedded instruments and their enclosures The distance between the back of the instrument and the vertical wall or reflecting surface should be 15m-5m. Be careful to avoid the contact between the protruding part of the instrument and the wall. No additional vibration isolation measures shall be taken except the requirements of the instrument itself. Its positioning complies with: For test rooms with rigid walls or special reverberation rates, the instrument under test shall be placed on the floor of the test room, and the distance between the back of the instrument and the vertical wall or reflecting surface is 15c-5cm. The distance between other surfaces and the adjacent walls of the test room shall not be less than 1.5m. For the approximate self-field environment above the lower reflecting surface, the instrument under test shall be placed on the alternate reflecting surface, and the distance between the back of the instrument and the second vertical receiving surface is 15cm-5cm. At the same time, the shape and size of the measuring surface shall be taken into consideration. 6.5.4 Wall-mounted appliances, including their accessories, shall be mounted on a fixed frame. No additional vibration isolation measures shall be applied except those required for the appliance itself. The positioning shall comply with the following:
For test rooms with rigid walls or special reverberation rooms, the tested appliance shall be mounted on the test room's plastic surface. For the approximate white field ring point above the reflection, the tested appliance shall be placed on the second reflecting surface of the test room: The lowest height of the appliance from the ground shall comply with the manufacturer's requirements. For such appliances, if preliminary tests show that the test values of the sound power level do not differ significantly when placed in different positions, the measurement or position of floor-standing appliances described in 6.5.1 may be used. 6.5.5 The appliance shall be installed in a cabinet or on a table that meets the requirements according to the manufacturer's instructions. 7 Measurement of sound pressure level
7.1 The position of the standard source (S>) of the microphone in the field above the reflection shall comply with the provisions of 7.1 to 7.4 of GB3767-1996. Unless otherwise specified in the special requirements, the measurement surface and the measurement point positions are as follows: (For the device under test, there are two measurement surfaces, but only one of them can be selected: the microphone can also select one of several measurement points.
7.1.1 For floor-standing instruments, including embedded instruments, the measurement surface is a hexahedron with several measurement points, then (7.3.1 of GB/T3767-1996 and Figure 3 of this standard. Then increase the measurement points in accordance with 7.3.2 of GB/T3767-1996, or according to B/T 3767.199G 7.4.2 Reduce the measurement point transmission and the position of the instrument:
Area of the loading surface
N-2(26-+ 2m + 20)
Continental pulling surface
Reference body
Figure! The measurement point position of the hexahedron measuring the loading surface of the soil from the mountain shelving GB/T 4214.1-2000
Note: If the special requirements are not otherwise specified, the front axis is the same. The measurement distance t is preferably m, and it is recommended to use the first measurement point in the following points to determine the time range, frequency spectrum, etc. of the instrument. 7.1.2 For floor-standing or table-top instruments placed against the wall: including embedded instruments. See GB/T 7.3.1 of GB/T 3767-1996 In standard Figure 2, the measuring surface is a short hexahedron with six measuring points. The measuring points can be increased according to 7.3.2 of GB/T 3767-1995, or the measuring points can be reduced according to 7.4.2 of GB/T 3767-1996. Transmitter position coordinates:
Area of measuring plate surface:
S-2ar-+h+h)
Its rotation body
Figure 2 Rectangular hexahedron measuring length of floor-standing instrument Position method of measuring points on the measuring surface: The front of the instrument faces the direction of the axis, and the measuring distance d is preferably used! . In order to test the time history, spectrum, etc. of the instrument, it is recommended to use the first measuring point of the six measuring points.
This measuring surface can also be Applicable to wall-mounted test equipment. Note: In this case, the axis number is vertically reflected and the upper axis is vertically aligned with the upper axis. The front of the equipment faces the axis. 7.1.3 For floor-standing cabinet-type equipment placed on the wall, including built-in equipment with a height greater than 2d but less than or equal to 5d, the measuring surface is a short six-sided test surface with 10 measuring points, as shown in Figure 3. If it is difficult to operate during the actual test (the equipment axis and ceiling are false), the ninth and third measuring points can be cancelled. According to GR/T 3767-1996 7.3.2 to increase the measuring points. You can also reduce the measuring points according to 7.4.2 of GB/T 3767-1996. The position coordinates of the sensor, the area of the measuring surface: --2(2ar+2- t:) If the instrument is as high as the pole, point 9 and point 10 are cancelled. S --2(2± -be) Reference body The rectangular hexahedron measuring station of the high-rise instrument placed against the wall is the measuring point position of the commercial soil Figure 3 GB/r4214.1-2000 Note: The instrument is facing the axis of the measuring station. The measuring distance is 1. The time history spectrum of the instrument is determined by using seven of the eight measuring points.
7.1.4 For the cabinet or table type and hand-held instruments (fixed on the test frame) with a horizontal reflective surface 1, each side of the reference body does not exceed 0.7m. The measuring surface is a sphere with ten points. See 7.2.1 of B/3767.-1996 and Figure 4 of this standard. Measuring points can be added in accordance with 7.2.2 of GB/T3767-1996, and the number of measuring points and the location of measuring points can also be changed in accordance with 7.2-1 of GB/T3767-1996. If the side length of the reference body exceeds 0.7m, the measuring point location and measuring surface described in 7.1.1 should be adopted. The diameter of the hemispherical measuring surface is preferably 2m, but in any case shall not be less than 1.5m. Transmitter position coordinates: 0.450.77 Area of the measuring surface S - ETH2
European and American color network
Measurement envelope
According to the following figure, the measuring points on the hemispherical rain measuring body surface of handheld, table and floor-standing instruments are located. Note: If the special requirements are otherwise specified, the front of the instrument faces the direction of the auxiliary. It is recommended to use the eighth point of the ten points to determine the time history of the instrument. Spectrum, etc.
7.1.5 The approximate length of the reference body 2, and 1 shall not exceed 0.4m and not exceed 0.1m, a small floor-standing instrument placed on a table (for example, a shoe polishing machine). The measuring base surface is a quarter-sphere with five measuring points. See 7.2.1 of G13/T3767-1996 and standard Figure 5, microphone position mark:
Measurement surface:
GB/ 4214.1 -2000
Figure 5 The measurement point of the quarter ball of a small floor-standing device placed against a wall is upward. Note that the frame recommends that the measurement point 6 of the five measurement points be used to measure the process of the instrument. 7.1.6 In normal use, the height of the geometric center of the reference body from the reference surface exceeds 1.1m. The measurement surface is a short hexahedron with five measurement points, see Figure 6. The center of the rectangular hexahedron coincides with the center of the reference body. The four measurement points are all 1m away from the outline of the instrument and are stored separately. On a plane that is parallel to the reflecting surface through its geometric center, the fifth measuring point is located 1m above the above plane. The axis and the axis describing the microphone position are both on the horizontal reflecting surface. The axis is in this plane. When the above five measuring points are used, the difference between the maximum sound pressure level and the minimum sound pressure level measured should usually be less than 5dB. When this condition cannot be met, four additional measuring points 6, 7, 8, and 0 must be added. See Figure 6. The area of the measuring surface is calculated by the following formula:
5- 4( + m Ia)
Note: Unless otherwise stated in the special requirements section, the instrument A should be turned in the opposite direction. Axis, except for the first measuring point, the time history, spectrum, etc. of the instrument are measured.1-2000
Note: If the special requirements are not otherwise specified, the front axis is the direction of the measurement. The measurement distance t is preferably m. It is recommended to use the first measurement point in the following viewpoints to determine the time range, frequency spectrum, etc. of the instrument. 7.1.2 For floor-standing or table-top instruments placed against the wall: including embedded instruments. See 7.3.1 of GB/T 3767-1996. In standard Figure 2, the measuring surface is a short hexahedron with six measuring points. Measuring points can be added according to 7.3.2 of GB/T 3767-1995, or according to 7.4.2 of GB/T 3767-1996. Reduce the measuring point sensor position coordinates:
The area of the measuring plate surface:
S-2ar-+h+h)
The rotating body
Figure 2 The measuring point position method on the rectangular six-body measuring surface of the floor-standing instrument: The front of the instrument faces the direction of the axis, and the measuring distance d is preferably used! . In order to test the time history, spectrum, etc. of the instrument, it is recommended to use the first measuring point of the six measuring points.
This measuring surface can also be Applicable to wall-mounted test equipment. Note: In this case, the axis number is vertically reflected and the upper axis is vertically aligned with the upper axis. The front of the equipment faces the axis. 7.1.3 For floor-standing cabinet-type equipment placed on the wall, including built-in equipment with a height greater than 2d but less than or equal to 5d, the measuring surface is a short six-sided test surface with 10 measuring points, as shown in Figure 3. If it is difficult to operate during the actual test (the equipment axis and ceiling are false), the ninth and third measuring points can be cancelled. According to GR/T 3767-1996 7.3.2 can be used to increase the measuring points. You can also reduce the measuring points according to 7.4.2 of GB/T 3767-1996. Sensor position coordinates, measuring the area of the attenuation surface:
--2(2ar+2- t:)
If the instrument is as high as the large flower pole,
point 9 and point 10 are cancelled
S--2(2± -be)bzxZ.net
Reference body
Measurement package road surface
A rectangular hexahedron measuring station table for measuring points of commercial soil placed against the wall
GB/r4214.1-2000
Note: The measuring device is placed with the front facing the axis. The measuring distance is 1 meter. The seven measuring points in the reference body are used to determine the time history spectrum of the measuring device.
7.1.4 For the cabinet or table type running instruments and hand-held instruments (fixed on the measuring surface) with each side length of the reference body not exceeding 0.7m, Test stand). The measuring surface is a spherical surface with ten points. See 7.2.1 of GB/T3767.-1996 and Figure 4 of this standard. Measuring points can be added according to 7.2.2 of GB/T3767--1996, and the number of measuring points and the position of measuring points can also be changed according to 7.2-1 of GB/T3767-1996. If the side length of the reference body exceeds 0.7m, the measuring point positions and measuring surfaces described in 7.1.1 should be adopted. The diameter of the hemispherical measuring surface is preferably 2m, but in any case it shall not be less than 1.5m. Transmitter position coordinates:
0. 450. 77
Measurement surface area
S - ETH2
Measurement envelope
According to the following diagrams, the measuring points on the hemispherical rain measuring body surface of handheld, table and floor-standing instruments are located. Note: If otherwise specified in the special requirements section, the front of the instrument faces the direction of the auxiliary. It is recommended to use the eighth point of the ten points to determine the time history of the instrument. Spectrum, etc.
7.1.5 The approximate length of the reference body 2, and 1 shall not exceed 0.4m and not exceed 0.1m, a small floor-standing instrument placed on a table (for example, a shoe-shining machine). The measuring base surface is a quarter-sphere with five measuring points. See 7.2.1 of G13/T3767-1996 and Figure 5 of the standard. Microphone position:
Measuring surface:
GB/ 4214.1-2000
Figure 5 Small floor-standing device placed against a wall with the measuring surface facing upwards, and the frame recommends using point 6 of the five measuring points. 7.1.6 In normal use, vertical devices with the geometric center of the measuring surface exceeding 1.1m from the measuring surface shall be short hexahedron with five measuring points, see Figure 6. The center of the rectangular hexahedron coincides with the center of the reference body. The four measuring points are all 1m away from the instrument and are located on a plane that is parallel to the reflection surface through its geometric center. The fifth measuring point is located 1m upward from the above plane. The axis and the axis describing the position of the microphone are on the same horizontal reflection surface. The axis is in this plane. When the above five measuring points are used, the difference between the maximum sound pressure level and the minimum sound pressure level measured should usually be less than 5dB. When this condition cannot be met, four additional measuring points 6, 7, 8, and 0 must be added. See Figure 6. The area of the measurement surface is calculated by the following formula:
5- 4( + m Ia)
Note: Unless otherwise stated in the special requirements section by the factory, the instrument A should be turned in the opposite direction. Axis, only the first measuring point is used to measure the time history, spectrum, etc. of the instrument.1-2000
Note: If the special requirements are not otherwise specified, the front axis is the direction of the measurement. The measurement distance t is preferably m. It is recommended to use the first measurement point in the following viewpoints to determine the time range, frequency spectrum, etc. of the instrument. 7.1.2 For floor-standing or table-top instruments placed against the wall: including embedded instruments. See 7.3.1 of GB/T 3767-1996. In standard Figure 2, the measuring surface is a short hexahedron with six measuring points. Measuring points can be added according to 7.3.2 of GB/T 3767-1995, or according to 7.4.2 of GB/T 3767-1996. Reduce the measuring point sensor position coordinates:
The area of the measuring plate surface:
S-2ar-+h+h)
The rotating body
Figure 2 The measuring point position method on the rectangular six-body measuring surface of the floor-standing instrument: The front of the instrument faces the direction of the axis, and the measuring distance d is preferably used! . In order to test the time history, spectrum, etc. of the instrument, it is recommended to use the first measuring point of the six measuring points.
This measuring surface can also be Applicable to wall-mounted test equipment. Note: In this case, the axis number is vertically reflected and the upper axis is vertically aligned with the upper axis. The front of the equipment faces the axis. 7.1.3 For floor-standing cabinet-type equipment placed on the wall, including built-in equipment with a height greater than 2d but less than or equal to 5d, the measuring surface is a short six-sided test surface with 10 measuring points, as shown in Figure 3. If it is difficult to operate during the actual test (the equipment axis and ceiling are false), the ninth and third measuring points can be cancelled. According to GR/T 3767-1996 7.3.2 can be used to increase the measuring points. You can also reduce the measuring points according to 7.4.2 of GB/T 3767-1996. Sensor position coordinates, measuring the area of the attenuation surface:
--2(2ar+2- t:)
If the instrument is as high as the large flower pole,
point 9 and point 10 are cancelled
S--2(2± -be)
Reference body
Measurement package road surface
A rectangular hexahedron measuring station table for measuring points of commercial soil placed against the wall
GB/r4214.1-2000
Note: The measuring device is placed with the front facing the axis. The measuring distance is 1 meter. The seven measuring points in the reference body are used to determine the time history spectrum of the measuring device.
7.1.4 For the cabinet or table type running instruments and hand-held instruments (fixed on the measuring surface) with each side length of the reference body not exceeding 0.7m, Test stand). The measuring surface is a spherical surface with ten points. See 7.2.1 of GB/T3767.-1996 and Figure 4 of this standard. Measuring points can be added according to 7.2.2 of GB/T3767--1996, and the number of measuring points and the position of measuring points can also be changed according to 7.2-1 of GB/T3767-1996. If the side length of the reference body exceeds 0.7m, the measuring point positions and measuring surfaces described in 7.1.1 should be adopted. The diameter of the hemispherical measuring surface is preferably 2m, but in any case it shall not be less than 1.5m. Transmitter position coordinates:
0. 450. 77
Measurement surface area
S - ETH2
Measurement envelope
According to the following diagrams, the measuring points on the hemispherical rain measuring body surface of handheld, table and floor-standing instruments are located. Note: If otherwise specified in the special requirements section, the front of the instrument faces the direction of the auxiliary. It is recommended to use the eighth point of the ten points to determine the time history of the instrument. Spectrum, etc.
7.1.5 The approximate length of the reference body 2, and 1 shall not exceed 0.4m and not exceed 0.1m, a small floor-standing instrument placed on a table (for example, a shoe-shining machine). The measuring base surface is a quarter-sphere with five measuring points. See 7.2.1 of G13/T3767-1996 and Figure 5 of the standard. Microphone position:
Measuring surface:
GB/ 4214.1-2000
Figure 5 Small floor-standing device placed against a wall with the measuring surface facing upwards, and the frame recommends using point 6 of the five measuring points. 7.1.6 In normal use, vertical devices with the geometric center of the measuring surface exceeding 1.1m from the measuring surface shall be short hexahedron with five measuring points, see Figure 6. The center of the rectangular hexahedron coincides with the center of the reference body. The four measuring points are all 1m away from the instrument and are located on a plane that is parallel to the reflection surface through its geometric center. The fifth measuring point is located 1m upward from the above plane. The axis and the axis describing the position of the microphone are on the same horizontal reflection surface. The axis is in this plane. When the above five measuring points are used, the difference between the maximum sound pressure level and the minimum sound pressure level measured should usually be less than 5dB. When this condition cannot be met, four additional measuring points 6, 7, 8, and 0 must be added. See Figure 6. The area of the measurement surface is calculated by the following formula:
5- 4( + m Ia)
Note: Unless otherwise stated in the special requirements section by the factory, the instrument A should be turned in the opposite direction. Axis, only the first measuring point is used to measure the time history, spectrum, etc. of the instrument.The measuring surface is a quarter-sphere with five measuring points. See 7.2.1 of G13/T3767-1996 and Figure 5 of the standard. Microphone position mark:
Measuring surface south:
GB/ 4214.1-2000
Figure 5 The measuring point position of the quarter-sphere measuring surface of a small floor-standing device placed against a wall is upward. It is recommended to use point 6 of the five measuring points to measure the process of the measuring device. 7.1.6 In normal use, the height of the geometric center of the vertical device from the surface of the standard body exceeds 1.1m. The measuring surface is a short hexahedron with five measuring points, see Figure 6. The center of the rectangular hexahedron coincides with the center of the reference body. The four measuring points are all 1m away from the instrument and are located on a plane that is parallel to the reflection surface through its geometric center. The fifth measuring point is located 1m upward from the above plane. The axis and the axis describing the position of the microphone are on the same horizontal reflection surface. The axis is in this plane. When the above five measuring points are used, the difference between the maximum sound pressure level and the minimum sound pressure level measured should usually be less than 5dB. When this condition cannot be met, four additional measuring points 6, 7, 8, and 0 must be added. See Figure 6. The area of the measurement surface is calculated by the following formula:
5- 4( + m Ia)
Note: Unless otherwise stated in the special requirements section by the factory, the instrument A should be turned in the opposite direction. Axis, only the first measuring point is used to measure the time history, spectrum, etc. of the instrument.The measuring surface is a quarter-sphere with five measuring points. See 7.2.1 of G13/T3767-1996 and Figure 5 of the standard. Microphone position mark:
Measuring surface south:
GB/ 4214.1-2000
Figure 5 The measuring point position of the quarter-sphere measuring surface of a small floor-standing device placed against a wall is upward. It is recommended to use point 6 of the five measuring points to measure the process of the measuring device. 7.1.6 In normal use, the height of the geometric center of the vertical device from the surface of the standard body exceeds 1.1m. The measuring surface is a short hexahedron with five measuring points, see Figure 6. The center of the rectangular hexahedron coincides with the center of the reference body. The four measuring points are all 1m away from the instrument and are located on a plane that is parallel to the reflection surface through its geometric center. The fifth measuring point is located 1m upward from the above plane. The axis and the axis describing the position of the microphone are on the same horizontal reflection surface. The axis is in this plane. When the above five measuring points are used, the difference between the maximum sound pressure level and the minimum sound pressure level measured should usually be less than 5dB. When this condition cannot be met, four additional measuring points 6, 7, 8, and 0 must be added. See Figure 6. The area of the measurement surface is calculated by the following formula:
5- 4( + m Ia)
Note: Unless otherwise stated in the special requirements section by the factory, the instrument A should be turned in the opposite direction. Axis, only the first measuring point is used to measure the time history, spectrum, etc. of the instrument.
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