GB/T 3785.2-2023 English PDFUS$654.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 3785.2-2023: Electroacoustics - Sound level meters - Part 2: Pattern evaluation tests Status: Valid GB/T 3785.2: Historical versions
Basic dataStandard ID: GB/T 3785.2-2023 (GB/T3785.2-2023)Description (Translated English): Electroacoustics - Sound level meters - Part 2: Pattern evaluation tests Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: A59 Classification of International Standard: 17.140.50 Word Count Estimation: 36,338 Date of Issue: 2023-05-23 Date of Implementation: 2023-12-01 Older Standard (superseded by this standard): GB/T 3785.2-2010 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 3785.2-2023: Electroacoustics - Sound level meters - Part 2: Pattern evaluation tests---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.ICS17:140:50 CCSA59 National Standards of People's Republic of China GB/T 3785:2-2023/IEC 61672-2:2013 Replacing GB/T 3785:2-2010 Electroacoustic Sound Level Meter Part 2: Type evaluation test (IEC 61672-2:2013, IDT) Released on 2023-05-23 2023-12-01 Implementation State Administration for Market Regulation Released by the National Standardization Management Committee table of contentsPreface III Introduction V 1 Scope 1 2 Normative references 1 3 Terms and Definitions 2 4 Trial submission 2 5 Symbols of the sound level meter and information in the instruction manual 3 6 Mandatory functions and general requirements 3 7 Environmental, electrostatic and radio frequency test 5 7:1 General 5 7:2 Measurement uncertainty of environmental test conditions 5 7:3 Influence of static pressure 5 7:4 Limits for air temperature, relative humidity and static pressure 6 7:5 Environmental adaptation requirements for air temperature and relative humidity effects test 6 7:6 Simplified test for combined effects of air temperature and relative humidity 6 7:7 Effect of air temperature 7 7:8 Effect of relative humidity 8 7:9 Effects of Electrostatic Discharge 9 7:10 Influence of AC power frequency field and radio frequency field 9 7:10:1 Acoustic signal 9 7:10:2 AC power frequency test 9 7:10:3 Radio frequency test 10 8 Radio Frequency Emissions and Public Power Disturbance 11 9 Electroacoustic performance test 12 9:1 General 12 9:2 Calibration check frequency indication 13 9:3 Pointing to Response 13 9:4 Acoustic signal test for frequency weighting 14 9:4:1 General 14 9:4:2 Windshield correction 15 9:4:3 Free field test 15 9:4:4 Comparative coupler test 15 9:4:5 Compliance16 9:4:6 Random incidence 16 9:5 Electrical signal test for frequency weighting 16 9:5:1 General 16 9:5:2 The first optional test procedure (changing the input signal level) 17 9:5:3 The second optional test procedure (constant input signal level) 17 9:5:4 Compliance17 9:5:5 Frequency weighting C or Z at 1 kHz 17 9:6 Correction for effects from sound level meter housing reflections and microphone diffraction 17 9:7 Corrections for obtaining free-field sound levels or random-incidence sound levels18 9:8-level linear19 9:8:1 Test 19 when the air temperature is close to the reference air temperature 9:8:2 Tests at elevated temperatures 19 9:9 Underrange indication 20 9:10 Self-generated noise level 20 9:11 Decay time constants of time-weighted F and S 20 9:12 Tone burst response of a sound level meter for measuring time-weighted sound levels 20 9:13 Tone burst response of sound level meters for measuring sound exposure level or time-averaged sound level 21 9:14 Response of a sound level meter for measuring time-averaged sound levels to repeated tone burst sequences 22 9:15 Overload indication 22 9:16 C-weighted peak sound level 23 9:17 Reset 23 9:18 Electrical output 23 9:19 Timing function 23 9:20 Crosstalk in Multichannel Sound Level Meter Systems 23 9:21 Power 23 10 Type Evaluation Report 24 Reference 25forewordThis document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules for Standardization Documents" drafting: This document is part 2 of GB/T 3785 "Electroacoustic Sound Level Meter": GB/T 3785 has issued the following parts: --- Part 1: Specifications; --- Part 2: Type evaluation test; --- Part 3: Periodic test: This document replaces GB/T 3785:2-2010 "Electroacoustic Sound Level Meter Part 2: Type Evaluation Test", and GB/T 3785:2- Compared with:2010, except for structural adjustment and editorial changes, the main technical changes are as follows: a) Changed the requirements for C frequency weighting of Class 1 sound level meter (see 6:7, 6:7 of the:2010 edition); b) Changed the requirements for the sound level meter capable of indicating the C-weighted peak sound level (see 6:8, 6:8 of the:2010 edition); c) Change the compliance criterion (see 6:19, 6:19 of the:2010 edition); d) Changed the statement about uncertainty (see 6:21 and 6:22, 6:21 and 6:22 of the:2010 edition); e) Deleted the requirement on the maximum allowable error of legal metrology (see 6:23 of the:2010 edition); f) Added the suggestion that the instruction manual should be adopted for the type evaluation test (see 6:23); g) Changed the requirements for the sound calibrator used in the environmental test (see 7:1:4, 7:1:4 of the:2010 edition); h) The provision that electrical signals can be used in the simplified test of the combined effects of air temperature and relative humidity has been added (see the third item in 7:6:6): column item); i) Added an alternative method for the immunity test (see 7:10:3:1); j) Changed the range of the carrier frequency in the radio frequency test (see 7:10:3:6, 7:10:3:6 of the:2010 edition); k) Added the requirements for monitoring the stability of the sound field in the electroacoustic performance test (see 9:1:3); l) Added the requirements for evaluating the measurement uncertainty in the free-field test device (see 9:1:8); m) Added the requirement to verify calibration inspection frequency adjustment data (see 9:2:3); n) The requirement to verify the frequency weighting of the sound level meter whose reference direction is not along the symmetry axis of the microphone is added (see 9:4:1:7); o) Changed the content of the correction value of the test windshield (see 9:4:2, 9:4:1:7 and 9:6 of the:2010 edition); p) Added the provision that the laboratory standard microphone can be replaced by the working standard microphone in the comparative coupler test (see 9:4:4:1); q) Deleted content about flat (FLAT) frequency response (see 9:5:6~9:5:8 of the:2010 edition); r) Added the content that the comparative coupler can be used in the verification of the free-field sound level correction value (see 9:7); s) Added the content of random incident sound level correction value (see 9:7); t) Changed the requirements for self-generated noise levels (see 9:10:5, 9:10:5 of the:2010 edition); u) Added the requirement to report the self-generated noise level (see 10:2); v) References added: This document identically adopts IEC 61672-2:2013 "Electroacoustic Sound Level Meter Part 2: Type Evaluation Test": This document has made the following minimal editorial changes: ---Incorporated the amendments of IEC 61672-2:2013/Amd:1:2017, the outer margins of the terms involved are in vertical Straight double lines (‖) are marked: Please note that some contents of this document may refer to patents: The issuing agency of this document assumes no responsibility for identifying patents: This document is proposed by the Ministry of Industry and Information Technology of the People's Republic of China: This document is under the jurisdiction of the National Electroacoustics Standardization Technical Committee (SAC/TC23): This document is drafted by: Hunan Shengyi Measurement and Control Technology Co:, Ltd:, Hangzhou Aihua Instrument Co:, Ltd:, China National Institute of Metrology, Institute of Acoustics, Chinese Academy of Sciences, Shenzhen Institute of Metrology and Quality Inspection, Jiaxing Branch of State-owned Hongsheng Equipment Factory, China Electronics Technology Group Corporation Division III Research Institute, Zhejiang Academy of Metrology: The main drafters of this document: Liu Xiangheng, Zhang Shaodong, Niu Feng, Li Xiaodong, Zhang Guoqing, Shu Guohua, Zhang Xudong, Qiu Jianmin, Tan Jiateng, Sang Jinqiu: The release status of previous versions of this document and the documents it replaces are as follows: ---In 1983, GB/T 3785-1983 "Electrical and Acoustic Performance and Test Methods of Sound Level Meter" was released for the first time; --- GB/T 17181-1997 "Integral Average Sound Level Meter" was incorporated into GB/T 17181-1997 when it was revised for the first time in:2010, and it is divided into 3 parts: This document For GB/T 3785:2-2010; --- This is the second revision:IntroductionGB/T 3785 "Electroacoustic Sound Level Meter" aims to specify the performance specification of the sound level meter and the verification method for its compliance: It consists of three parts constitute: --- Part 1: Specifications: The purpose is to standardize the electroacoustic performance of sound level meters: --- Part 2: Type evaluation test: The aim is to ensure that all laboratories perform type evaluation of sound level meters in a consistent manner: price test: --- Part 3: Periodic test: The aim is to ensure that all laboratories perform periodic testing of sound level meters in a consistent manner: In order to verify compliance with the performance specification, this document uses different criteria from the:2010 edition: The national standards for sound level meters issued between 1983 and:1997 did not provide information on measurement uncertainty when verifying compliance with specifications: Any requests and suggestions: Due to the lack of requirements and recommendations on measurement uncertainty, when the measured deviation from the design target is close to the allowable deviation limit, the specification Conformity becomes blurred: If compliance is based on whether the measurement deviation exceeds or does not exceed the limit value, the end user of the sound level meter will Risk of being exposed to actual deviations from design goals exceeding limits: In order to eliminate this ambiguity, GB/T 3785-2010 adopts the principle of taking into account the uncertainty of measurement when evaluating conformity in international standards: It provides two clear criteria for determining compliance with the specification: The two judging criteria are: a) The measured deviation from the design target plus the expanded measurement uncertainty does not exceed the applicable tolerance limit; b) The expanded measurement uncertainty does not exceed the specified maximum value: For most performance specifications, GB/T 3785-1983 and GB/T 3785-1983 and The design and manufacturing tolerances in GB/T 17181-1997 are used to calculate the tolerance limits: The tolerance limit is used to express the true deviation from the design target The limit value contains a probability of 95%: This document uses the Modified Code Conformity Assessment Criteria: Conformity is confirmed when the following conditions are met simultaneously: a) the measured deviation from the design target does not exceed the applicable acceptance limit; b) The measurement uncertainty does not exceed the corresponding maximum allowable uncertainty: Acceptance limits are similar to the design and manufacturing tolerances implied in GB/T 3785-2010: The actual uncertainty and the maximum allowable uncertainty are determined according to the inclusion probability of 95%: Improved conformity assessment criteria, not required for compliance with this make any changes to the sound level meter design: The maximum permissible measurement uncertainty is not equal to the uncertainty associated with sound level measurements: The uncertainty of measuring sound level is determined by the electroacoustic Performance is assessed against expected deviations from the relevant design goals, and uncertainties associated with specific measurement conditions are also evaluated: Unless more specific letters If the information is available, the contribution of the specific sound level meter to the total measurement uncertainty can be based on the acceptance limits and the maximum allowable uncertainty specified in this document: Make an evaluation: Electroacoustic Sound Level Meter Part 2: Type evaluation test1 ScopeThis document specifies the requirements for verifying that time-weighted sound level meters, integrated average sound level meters and integral sound level meters comply with the requirements given in IEC 61672-1: There are details of the tests required in the prerequisite specification, and if necessary, type evaluation tests are applied to each channel of the multi-channel sound level meter: This document applies to Class 1 and Class 2 sound level meters: Its purpose is to ensure that all laboratories use a consistent method to perform the type Evaluation test:2 Normative referencesThe contents of the following documents constitute the essential provisions of this document through normative references in the text: where dated references For documents, only the version corresponding to the date applies to this document; for undated reference documents, the latest version (including all amendments) applies used in this document: GB/T 6113:102-2018 Specifications for Radio Disturbance and Immunity Measuring Equipment and Measurement Methods Part 1-2: Radio Coupling devices for the measurement of conducted disturbances of disturbance and immunity measuring equipment (CISPR16-1-2:2014, IDT) Note: There is no technical difference between the referenced content of GB/T 6113:102-2018 and the referenced content of CISPR16-1-2:2006: GB/T 6113:201-2018 Specifications for radio disturbance and immunity measuring equipment and measurement methods Part 2-1: Radio Disturbance and immunity measurement method Conducted disturbance measurement (CISPR16-2-1:2014, IDT) Note: There is no technical difference between the referenced content of GB/T 6113:201-2018 and the referenced content of CISPR16-2-1:2010: GB/T 6113:203-2020 Specifications for Radio Disturbance and Immunity Measuring Equipment and Measurement Methods Part 2-3: Radio Disturbance and immunity measurement method Radiated disturbance measurement (CISPR16-2-3:2016, IDT) Note: There is no technical difference between the referenced content of GB/T 6113:203-2020 and the referenced content of CISPR16-2-3:2010: GB/T 9254:1-2021 Electromagnetic compatibility of information technology equipment, multimedia equipment and receivers Part 1: Emission requirements (CISPR32:2015MOD) Note: There is no technical difference between the referenced content of GB/T 9254:1-2021 and the referenced content of CISPR22:2008: GB/T 17626:2-2018 Electromagnetic Compatibility Test and Measurement Technology Electrostatic Discharge Immunity Test (IEC 61000-4-2: 2008, IDT) GB/T 17626:3-2016 Electromagnetic Compatibility Test and Measurement Technology Radio Frequency Electromagnetic Field Radiation Immunity Test (IEC 61000- 4-3:2010, IDT) GB/T 17626:20-2014 Electromagnetic Compatibility Test and Measurement Technique Transverse Electromagnetic (TEM) Waveguide Emission and Immunity Degree test (IEC 61000-4-20:2010, IDT) ISO /IEC Guide98-3 Measurement Uncertainty Part 3: Guidelines for the Expression of Measurement Uncertainty (GUM:1995) [Uncer- Note: GB/T 27418-2017 Evaluation and Expression of Measurement Uncertainty (ISO /IEC Guide98-3:2008, MOD) ISO /IEC Guide99 International Vocabulary of Metrology Basic common concepts and related terms (VIM) [Internationalvo- Note: JJF1001-2011 General Measurement Terms and Definitions (ISO /IEC Guide99:2007, NEQ) ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 3785.2-2023_English be delivered?Answer: Upon your order, we will start to translate GB/T 3785.2-2023_English as soon as possible, and keep you informed of the progress. 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