JJG 449-2014 English PDF

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JJG 449-2014: Verification Regulation of Octave-Band and Fractional-Octave-Band Filters
Status: Valid

JJG 449: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJG 449-2014	669	Add to Cart	5 days	Verification Regulation of Octave-Band and Fractional-Octave-Band Filters	Valid
JJG 449-2001	RFQ	ASK	9 days	Verification Regulation of Octave-Band and One-Third-Octave Band Filters	Obsolete
JJG 449-1986	RFQ	ASK	3 days	Verification Regulation of Octave-band and One-third-octave-band Filters	Obsolete

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Basic data

Standard ID: JJG 449-2014 (JJG449-2014)
Description (Translated English): Verification Regulation of Octave-Band and Fractional-Octave-Band Filters
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A56
Word Count Estimation: 29,214
Date of Issue: 8/25/2014
Date of Implementation: 2/25/2015
Older Standard (superseded by this standard): JJG 449-2001
Quoted Standard: JJF 1001-2011; JJF 1034-2005; GB 3102.5; GB 3102.7; GB/T 3241-2010
Adopted Standard: IEC 61260-1, NEQ; IEC 61260-3, NEQ; OIML R130-2001(E), NEQ
Regulation (derived from): People's Republic of China The State Administration of Quality Supervision, Inspection and Quarantine Notice 2014 (No. 95); AQSIQ Notice 2014 No. 95
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine
Summary: This Standard applies within the audible frequency range of 1 and 2 octave filters and fractional octave filters initial verification, use and subsequent verification check.

JJG 449-2014: Verification Regulation of Octave-Band and Fractional-Octave-Band Filters

---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.
introduction The procedure according to the rules JJF1002-2010 "national verification procedures to write rules" given the preparation, and "Evaluation and Expression of Uncertainty in Measurement" in accordance with the requirements of JJF1059.1-2012 assessment and expressed measurement uncertainty. This procedure reference international standards IEC 61260-1 "electrical acoustic octave and fractional octave filters first Part 1. Specification "(Electroacoustics-Octave-bandandfractional-octave-bandfilters-Part 1. Specifications) ①, IEC 61260-3 "electrical acoustic octave and fractional octave filters - Part 3. Cycle test "(Electroacoustics-Octave-bandandfractional-octave-bandfilters-Part 3. Periodictests) ② and international recommendations OIMLR1302001 (E) version of "octave and 1/3 octave filters" The procedures in place JJG 449-2001 "octave and 1/3 octave filters." And JJG 449-2001 phase Ratio, the main technical changes are as follows. --- Increasing the content of other fractional octave filters other than 1/3 (see Chapter 1, Appendix A and Appendix B); --- Remove the filter in relation to 0 (see 2001 edition of Chapters 1 and 5); --- Delete the contents of the relevant appraisement and prototype testing (see the 2001 edition of Chapter 1, 7.3 and Annex C); --- Remove the filter bandwidth of 10 terms and definitions, additional definitions of the band-pass filter 5 terms (See Chapter 3, Section 3 of the 2001 edition); --- Increased in relation to the center frequency relative attenuation (see 5.1 and 7.3.2); --- Modify the relative attenuation limit (see Table 2, 2001 edition of the Table 2); --- Modified linear level requirements (see 53, 2001 version 5.4.); --- Removed and the contents of the relevant output signal (see 2001 edition 5.7 and 7.2.2.5); --- Deleted the contents of the flat frequency response (see 2001 edition 5.8 and 7.2.2.6); --- Modify the test project and use of inspection items (see 711, 2001 edition 7.1.); --- Revised standards on the measurement and the main equipment requirements (see the edition of 7.2.1,2001 7.2.1.1); --- Modify the verification of environmental conditions (see 722, 2001 edition of 7.2.1.2..); --- Increasing the uncertainty of measurement requirements (see 7.2.4); --- Revised test methods relative attenuation (see 733, 2001 edition of 7.2.2.3..); --- Revised test method-level linearity error (see 734, 2001 edition of 7.2.2.4..); --- Modify the use of inspection methods (see 7.6 2, 2001 edition of 7.4.3). The previous versions of the release JJG 449 case. --- JJG 449-2001; --- JJG 449-1986. ① The document is still in FDIS stage. ② The file is still in the CD stage. Octave and fractional octave filters test procedures

1 Scope

This procedure is applied within the audible frequency range of the Level 1 and Level 2 octave filters and fractional octave filters first seizure Set, and use the subsequent verification check. 2. References This procedure references the following documents. JJF1001-2011 common measurement terms and definitions JJF1034-2005 acoustic measurement terminology and definitions GB 3102.5 Quantities and units of electricity and magnetism GB 3102.7 Quantities and units of acoustics GB/T 3241-2010 electro-acoustics octave and fractional octave filters For dated references, only the dated edition applies to this procedure; undated reference documents Member, the latest edition (including any amendments) applies to this procedure.

3 terminology and units of measurement

3.1 Terms and Definitions JJF1001-2011, JJF1034-2005 and JJF1059.1-2012 defined and following terms and definitions applicable Used in this procedure. 3.1.1 bandpass filter bandpassfilter Has a single transmission band (or with a small relative attenuation passband) filters, which is greater than the transmission band from Lower frequency zero extends to the upper frequency limited. [GB/T 3241-2010, Definition 3.1] 3.1.2 octave frequency than octavefrequencyratio The nominal value of one octave or 2.1 frequency ratio. 3.1.3 Bandwidth indicated value bandwidthdesignator Score for indicating octave bandwidth, including a positive integer including reciprocal. NOTE. the bandwidth indication for indicating a set value of a nominal bandwidth of each filter in the filter, e.g., 1/b = 1/12, description of these filter It is 1/12 octave band-pass filter. 3.1.4 reference frequency referencefrequency For normalized single-frequency attenuation of all filters in the filter bank response. Note. In this procedure, the reference frequency is set to 1kHz. 3.1.5 accurate [band] center frequency exactmidbandfrequency Relationship with the provisions of the reference frequency, so that at a predetermined bandwidth filter banks, any two adjacent band-pass filter The exact same frequency than the center frequency of the filter. 3.1.6 Nominal [band] center frequency nominalmidbandfrequency Logo for the bandpass filter center frequency and rounding. [GB/T 3241-2010, the definition 3.6] ......

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