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GB/T 3241.2-2025 English PDF

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US$454.00 · In stock
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GB/T 3241.2-2025: Electroacoustics - Octave-band and fractional-octave-band filters - Part 2: Pattern evaluation tests
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 3241.2-2025	454	Add to Cart	3 days	Electroacoustics - Octave-band and fractional-octave-band filters - Part 2: Pattern evaluation tests	Valid

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Basic data

Standard ID: GB/T 3241.2-2025 (GB/T3241.2-2025)
Description (Translated English): Electroacoustics - Octave-band and fractional-octave-band filters - 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: 22,290
Date of Issue: 2025-05-30
Date of Implementation: 2025-12-01
Older Standard (superseded by this standard): GB/T 3241-2010
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 3241.2-2025: Electroacoustics - Octave-band and fractional-octave-band filters - 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.
ICS 17.140.50 CCSA59 National Standard of the People's Republic of China Partially replaces GB/T 3241-2010 Electroacoustic Octave and Fractional Octave Filters Part 2.Type evaluation tests (IEC 61260-2.2016, IDT) Released on 2025-05-30 2025-12-01 Implementation State Administration for Market Regulation The National Standardization Administration issued

Preface III Introduction IV 1 Scope 1 2 Normative references 1 3 Terms and Definitions 2 4 Test Submission 3 5 Filter markings and information in the operating instructions 3 6 Required Features and General Requirements 3 6.1 General requirements 3 6.2 Test equipment 4 7 Tests under reference conditions 4 7.1 General requirements 4 7.2 Relative attenuation, effective bandwidth deviation and sum of output signals 5 7.2.1 General 5 7.2.2 Relative attenuation 5 7.2.3 Effective bandwidth deviation 5 7.2.4 Sum of output signals 6 7.3 Linear operating range, measuring range, level range controller and overload indicator 6 7.4 Time-invariant work 7 7.5 Power supply check 7 8 Electromagnetic and electrostatic compatibility requirements 7 8.1 General requirements 7 8.2 Effects of Electrostatic Discharge 7 8.3 Influence of AC power frequency field and radio frequency field 8 8.3.1 Input signal 8 8.3.2 Range Setting 8 8.3.3 AC power frequency test 8 8.3.4 Radio frequency test 8 8.4 Radio frequency emissions and public power disturbances 9 9 Sensitivity to ambient air temperature and relative humidity 9 10 Type evaluation report 10 Appendix A (informative) Uncertainties associated with the sine sweep test 11 A.1 Overview 11 A.2 Digitally generated signals 11 A.3 Test signal from signal generator 12 A.4 Comparative measurement method 12 Appendix B (Informative) Time-invariant operation test using exponential scanning --- Example 13 B.1 Overview 13 B.2 Example 13 Reference 15

Foreword

This 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 3241 "Electroacoustic octave and fractional octave filters". GB/T 3241 has been published The following parts. --- Part 1.Specification; --- Part 2.Type evaluation test. This document partially replaces the type evaluation test in GB/T 3241-2010 "Electroacoustic Octave and Fractional Octave Filters" Compared with the relevant content of GB/T 3241-2010, in addition to structural adjustments and editorial changes, the main technical changes are as follows. a) Added test submission requirements (see Chapter 4); b) Added essential functions and general requirements (see 6.1); c) The requirements for test instruments have been changed (see 6.2, 5.2 of the.2010 edition); d) Added performance test items such as overload indicator and power supply (see 7.3 and 7.5); e) Deleted performance test items such as anti-aliasing filter and flat frequency response (see 5.7 and 5.9 of the.2010 edition); f) The performance test method has been changed (see Chapter 7, Chapter 5 of the.2010 edition); g) The test methods for electromagnetic compatibility items have been changed (see Chapter 8, Chapter 8 of the.2010 edition); h) The test method for the influence of ambient air temperature and relative humidity has been changed (see Chapter 9, 5.10 of the.2010 edition); i) Added requirements for type evaluation reports (see Chapter 10). This document is equivalent to IEC 61260-2.2016 "Electroacoustic octave and fractional octave filters Part 2.Type evaluation test". The following minimal editorial changes were made to this document. --- Incorporated the revised content of IEC 61260-2.2016/Amd1.2017, the outer margin position of the clauses involved is marked with vertical Straight double lines (‖) are marked. Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document was 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 was drafted by. Hunan Shengyi Measurement and Control Technology Co., Ltd., Hangzhou Aihua Instrument Co., Ltd., China Institute of Metrology, Institute of Acoustics, Chinese Academy of Sciences, the Third Institute of China Electronics Technology Group Corporation, Nanjing University, Zhejiang Institute of Metrology, State-owned Jiaxing Branch of Factory 380, Shenzhen Tiansuo Metrology and Testing Co., Ltd., and China National Environmental Monitoring Center. The main drafters of this document are. Liu Xiangheng, Zhang Shaodong, Qin Zhaoqi, Li Xiaodong, Cui Jian, Shen Yong, Qiu Jianmin, Shu Guohua, Zhang Guoqing, Wen Xiangcai, Tan Xiaoming, Niu Feng, Wu Xin, Chen Kai, Luo Peng. The previous versions of this document and the documents it replaces are as follows. ---First published as GB/T 3241-1982 in 1982, first revised in.1998, second revised in.2010; --- This is the third revision, GB/T 3241-2010 is divided into 3 parts, the standard number of this part is

Introduction

A filter is a device that separates the components of a signal by frequency, and octave and fractional octave filters are devices that have a single A bandpass filter with a transmission band and an upper cutoff frequency and a lower cutoff frequency ratio equal to an octave frequency ratio or a certain power thereof. Octave and fractional Octave filters are usually used in conjunction with sound measuring instruments such as sound level meters for spectral analysis of sound signals. GB/T 3241 aims to specify the performance requirements for octave and fractional octave filters and to describe the type evaluation tests and periodic tests. The method is planned to consist of three parts. --- Part 1.Specification. The purpose is to specify the performance requirements for octave and fractional octave filters. --- Part 2.Type evaluation test. The purpose is to ensure that all testing laboratories use a consistent method to perform octave and fractional Type evaluation test of octave band filters. --- Part 3.Periodic test. The purpose is to ensure that all testing laboratories or metrology laboratories perform octave testing in a consistent manner. and periodic experiments with fractional-octave filters. To evaluate compliance with performance requirements, this document uses different criteria from GB/T 3241-2010. GB/T 3241-2010 does not provide any requirements or recommendations for taking measurement uncertainty into account in the evaluation of conformity to performance requirements. Due to the lack of requirements or recommendations on measurement uncertainty, when the measured deviation from the design target is close to the limit of the allowable deviation, The determination of compliance with the requirement becomes ambiguous. If compliance is determined based on whether the measured deviation exceeds the limit, then the octave and The end user of the fractional-octave band filter will be subject to the risk that the actual deviation from the design target exceeds the limit. To eliminate ambiguity, the 29th Technical Committee of the International Electrotechnical Commission (IEC) determined at its.1996 meeting that in formulating standards, The measurement uncertainty should be taken into account when formulating the performance evaluation rules. This document adopts the modified criteria for compliance with the requirements. Compliance 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 permissible uncertainty. The acceptance limits are similar to the design and manufacturing tolerance limits in GB/T 3241-2010. The actual measurement uncertainty and the maximum allowable measurement uncertainty are determined based on a coverage probability of 95%, unless there is more specific information. Otherwise, the acceptance limits and maximum allowable uncertainties specified in this document can be used to evaluate specific octave or fractional octave filters. or the contribution of the filter bank to the total measurement uncertainty. Electroacoustic Octave and Fractional Octave Filters Part 2.Type evaluation tests

1 Scope

1.1 This document provides verification that octave and fractional octave filters (hereinafter referred to as filters) conform to GB/T 3241.1-2025. Details of all required tests for the mandatory specifications. 1.2 These tests and test methods apply to both Class 1 and Class 2 filters. The purpose is to ensure that all testing laboratories use consistent methods. The type evaluation test shall not be carried out in accordance with the law.

2 Normative references

The contents of the following documents constitute essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. GB/T 3241.1-2025 Electroacoustic octave and fractional octave filters Part 1.Specification (IEC 61260-1. 2014, IDT) GB/T 9254.1-2021 Electromagnetic compatibility of information technology equipment, multimedia equipment and receivers Part 1.Emission requirements (CISPR32.2015,MOD) Note. There is no technical difference between the content cited in GB/T 9254.1-2021 and the content cited in 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 17626.3-2023 Electromagnetic compatibility test and measurement technology Part 3.Radio frequency electromagnetic field radiation immunity test (IEC 61000-4-3.2020,IDT) Note. There is no technical difference between the referenced content of GB/T 17626.3-2023 and the referenced content of IEC 61000-4-3.2006. GB/T 17626.6-2017 Electromagnetic compatibility test and measurement technology Radio frequency field induced conducted disturbance immunity (IEC 61000- 4-6.2013,IDT) GB/T 17626.20-2014 Electromagnetic compatibility test and measurement technology Transverse electromagnetic wave (TEM) emission and immunity test in waveguide Test (IEC 61000-4-20.2010, IDT) GB/T 17799.2-2023 General electromagnetic compatibility standards Part 2.Immunity standards for industrial environments (IEC 61000-6- 2.2016,MOD) Note. There is no technical difference between the referenced content of GB/T 17799.2-2023 and the referenced content of IEC 61000-6-2.2005. ISO /IEC Guide 98-3 Measurement uncertainty Part 3.Guide to the expression of uncertainty in measurement (GUM..1995) 1995)] Note. GB/T 27418-2017 Evaluation and expression of measurement uncertainty (ISO /IEC Guide 98-3..2008, MOD) ISO /IEC Guide 98-4 Measurement uncertainty Part 4.The role of measurement uncertainty in conformity assessment Note. GB/T 27430-2022 The role of measurement uncertainty in conformity assessment (ISO /IEC Guide 98-4..2012, MOD) ISO /IEC Guide 99 International Vocabulary of Metrology Basic Common Concepts and Related Terms (VIM) [Internationalvo- ......

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Question 1: How long will the true-PDF of GB/T 3241.2-2025_English be delivered?

Answer: Upon your order, we will start to translate GB/T 3241.2-2025_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 3241.2-2025_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 3241.2-2025_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.