JJG 681-2025 English PDFUS$339.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email. JJG 681-2025: Verification Regulation of Dispersive Infrared Spectrophotometers Status: Valid JJG 681: Historical versions
Basic dataStandard ID: JJG 681-2025 (JJG681-2025)Description (Translated English): Verification Regulation of Dispersive Infrared Spectrophotometers Sector / Industry: Metrology & Measurement Industry Standard Word Count Estimation: 16,139 Date of Issue: 2025-02-08 Date of Implementation: 2025-08-08 Issuing agency(ies): State Administration for Market Regulation JJG 681-2025: Verification Regulation of Dispersive Infrared Spectrophotometers---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.National Metrology Verification Regulations of the People's Republic of China Verification procedures for dispersive infrared spectrophotometers Released on 2025-02-08 2025-08-08 Implementation The State Administration for Market Regulation issued Dispersive infrared spectrophotometer Verification procedures Replace JJG 681-1990 Responsible unit. National Physical and Chemical Metrology Technical Committee Main drafting unit. Heilongjiang Provincial Institute of Metrology and Testing China National Institute of Metrology Xinjiang Uygur Autonomous Region Metrology and Testing Institute Participating in the drafting. Shandong Institute of Metrology Zhongshi Walker (Tianjin) Technology Development Co., Ltd. This regulation is entrusted to the National Physical and Chemical Metrology Technical Committee for interpretation The main drafters of this regulation are. Ding Haiming (Heilongjiang Institute of Metrology, Verification and Testing) Tao Hong (China Institute of Metrology) Guo Li (Xinjiang Uygur Autonomous Region Metrology and Testing Institute) Participating drafters. Guo Bo (Shandong Institute of Metrology) Zhang Tao (Heilongjiang Institute of Metrology and Testing) In Asia (Heilongjiang Institute of Metrology and Testing) Zhao Penghui [Zhongshi Walker (Tianjin) Technology Development Co., Ltd.] Table of contentsIntroduction (II) 1 Scope(1) 2 Overview(1) 3 Metrological performance requirements (1) 4 General technical requirements(2) 5 Measuring instrument control (2) 5.1 Verification conditions (2) 5.2 Measurement standards and supporting equipment (2) 5.3 Verification Items (2) 5.4 Verification methods (3) 5.5 Processing of test results (4) 5.6 Verification cycle (4) Appendix A Transmittance calibration method of standard sector plate (5) Appendix B Original Record Format for Calibration of Dispersive Infrared Spectrophotometer (6) Appendix C Format of the inner page of the verification certificate/verification result notification (8)IntroductionJJF1002-2010 "Rules for the Preparation of National Measurement and Calibration Specifications", JJF1001-2011 "General Measurement Terms and Definition” and JJF1059.1-2012 “Evaluation and Expression of Uncertainty in Measurement” together constitute the basis for the formulation of this regulation. A series of basic specifications. Compared with JJG 681-1990, in addition to editorial modifications, the main technical changes are as follows. ---In "Range", the wave number range is limited to (4000~400) cm-1 Dispersive infrared spectrophotometer (See Chapter 1); --- In "Overview", the description and classification of optical zero-balance instruments were deleted, and the "Proportional Record" was modified. Description of the “recording format” (see Chapter 2); --- In the "Metrology Performance Requirements", the resolution requirement was deleted and the metrology performance index of stray radiation was reduced. (See Chapter 3); ---In "Metrology Standards", infrared wavelength standard filters, rotating standard fan plates, metrology Energy requirements (see 5.2.1); --- Added “Transmittance calibration method of standard sector plate” (see Appendix A). --- Added "Verification Certificate and Verification Result Notice Page Format" (see Appendix C) The previous versions of this regulation are as follows. ---JJG 681-1990. Verification procedures for dispersive infrared spectrophotometers1 ScopeThis procedure is applicable to the initial calibration of dispersive infrared spectrophotometers in the wave number range (4000~400) cm-1. Subsequent verification and in-use inspection.2 OverviewDispersive infrared spectrophotometer (hereinafter referred to as infrared spectrophotometer) is a kind of infrared spectrophotometer that can measure the absorption of a substance in the infrared spectrum. An instrument that uses spectral characteristics and the Lambert-Beer law to perform qualitative and quantitative analysis of substances. The light emitted by the light source is divided into two beams with equal and symmetrical energy. One beam is the sample light (denoted by S) passing through the sample The other is the reference light (denoted by R). After the two beams are modulated by the fan-shaped mirror to form an alternating signal, the two beams The light is photosynthesized into a beam, which is dispersed by the grating and then passes through the exit slit and is received by the detector. The signal is converted into a corresponding electrical signal, which is amplified by the amplifier and then enters the data processing unit. Schematic diagram of the meter structure. Figure 1 Schematic diagram of infrared spectrophotometer structure 3.Metrological performance requirements The metrological performance requirements of infrared spectrophotometer are shown in Table 1. Table 1 Infrared spectrophotometer measurement performance requirements Project measurement performance Wave number indication error In the range of [4000~ >2000)cm-1, it does not exceed ±8cm-1; in the range of [2000~400]cm-1, it does not exceed ±8cm-1. No more than ±4cm-1 Wave number indication repeatability In the range of [4000~ >2000)cm-1, it is not greater than 4cm-1; in the range of [2000~400]cm-1, it is not greater than Greater than 2cm-1 The transmittance indication error does not exceed ±0.5% The repeatability of the transmittance indication is no more than 0.3% Stray radiation in the range of (4000~650)cm-1 is no more than 2% The straightness of the baseline is within the wave number range of (4000~650) cm-1, and the straightness of 100% of the line is no more than 4% Baseline noise is no more than 1% ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of JJG 681-2025_English be delivered?Answer: Upon your order, we will start to translate JJG 681-2025_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. 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Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.Question 5: Should I purchase the latest version JJG 681-2025?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JJG 681-2025 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. |
