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JJG 178-2007 PDF English

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JJG 178-2007: Verification Regulation of Ultraviolet, Visible, Near-Infrared Spectrophotometers
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JJG 178: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] deliveryName of Chinese StandardStatus
JJG 178-2007English335 Add to Cart 0-9 seconds. Auto-delivery Verification Regulation of Ultraviolet, Visible, Near-Infrared Spectrophotometers Valid
JJG 178-2004EnglishRFQ ASK 3 days Measure for Gauge for Measuring Distance Between Inside Rim Faces of Wheels for Railway Locomotive and Vehicle
JJG 178-1996English439 Add to Cart 4 days Verification Regulation of Visible Range Spectrophotometer Obsolete
JJG 178-1989EnglishRFQ ASK 3 days (Chinese Industry Standard) Obsolete

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JJG 178-2007: Verification Regulation of Ultraviolet, Visible, Near-Infrared Spectrophotometers


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NATIONAL METROLOGICAL VERIFICATION Ultraviolet, Visible, Near-Infrared Spectrophotometers Issued on. NOVEMBER 21, 2007 Implemented on. MAY 21, 2008 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China This Regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine on November 21, 2007; and should come into effect on May 21, 2008. Administrative organization. National Physical and Chemical Metrology Technical Committee Chief drafting organization. Heilongjiang Provincial Institute of Measurement and Verification Participating drafting organization. National Institute of Metrology, China; Shanghai Precision Scientific Instrument Co., Ltd.; and Beijing Purkinje General Instrument Co., Ltd. This Regulation was entrusted to National Physical and Chemical Metrology Technical Committee for interpretation. Verification Regulation of Ultraviolet, Visible, Near-Infrared Spectrophotometers Replacing JJG 178-1996 JJG 689-1990 JJG 375-1996 JJG 682-1990 Chief drafting staffs of this Regulation. Ye Junan (Heilongjiang Provincial Institute of Measurement and Verification) Participating drafting staffs. Li Luming (National Institute of Metrology, China) Li Zheng (Shanghai Precision Scientific Instrument Co., Ltd.) Sun Hongwei (Beijing Purkinje General Instrument Co., Ltd.)

Table of Contents

1 Scope... 5 2 Normative References... 5 3 Overview... 5 4 Requirements for Metrology Performance... 6 4.1 Maximum allowable error of wavelength... 6 4.2 Wavelength repeatability... 6 4.3 Noise and drift... 7 4.4 Minimum spectral bandwidth... 7 4.5 Maximum allowable error of transmittance... 7 4.6 Transmittance repeatability... 7 4.7 Baseline flatness... 8 4.8 Adaptability of power supply voltage... 8 4.9 Stray light... 8 4.10 Compatibility of the absorption tank... 9 5 General Technical Requirements... 9 5.1 Safety performance... 9 5.2 Marking... 9 5.3 Appearance... 9 5.4 Absorption tank... 10 6 Control of Metrological Instrument... 10 6.1 Verification Conditions... 10 6.2 Verification Items... 11 6.3 Verification method... 11 6.4 Processing of verification results... 16 6.5 Verification period... 17 Appendix A Reference Wavelength of Wavelength Standard Substance... 18 Appendix B Transmittance of Potassium Dichromate Standard Solution at Different Temperatures and Different Spectral Bandwidths under Corresponding Wavelengths... 20 Appendix C Preparation Method of the Standard Solution... 21 Appendix D Verification Certificate Inner Page Format... 22 Appendix E Verification Record Format of Ultraviolet, visible and Near-Infrared Spectrophotometer... 23 Ultraviolet, Visible, Near-Infrared Spectrophotometers

1 Scope

This regulation is applicable to the initial verification, subsequent verification and in-use inspection of visible, ultraviolet-visible, ultraviolet-visible-near-infrared spectrophotometers with wavelengths ranging from 190nm to 2600nm and with continuously adjustable wavelengths.

2 Normative References

This Regulation quoted the following references. International Recommendation OIML R135 Edition 2004 Spectrophotometers for Medical Laboratories JJF 1001-1998 General Terms in Metrology and their Definitions JJF 1059-1999 Evaluation and Expression of Uncertainty in Measurement When using this Regulation, pay attention to use the effective edition of the above quoted references.

3 Overview

Ultraviolet-visible-near-infrared spectrophotometer (hereinafter referred to as the instrument) is an instrument for the quantitative analysis and qualitative identification of the substance based on the selective absorption of radiation (light) in the ultraviolet, visible and near-infrared regions by the molecules against the substance, and the Lambert-Beer law. The mathematical expression of the Lambert-Beer law is.

4 Requirements for Metrology Performance

In order to facilitate to describe the requirements for metrology performance, the working wavelength of the instrument is divided into three sections, namely Section-A (190nm~340nm), Section-B (340nm~900nm), Section-C (900nm~2600nm). According to the level of metrology performance, the instrument is divided into four levels. I, II, III, and IV. 4.1 Maximum allowable error of wavelength The maximum allowable error of the wavelength of the instrument shall meet the requirements of Table 1. 4.2 Wavelength repeatability The wavelength repeatability of the instrument shall meet the requirements of Table 2. Level Section-A Section-B Section-C 4.6 Transmittance repeatability The transmittance repeatability of the instrument shall meet the requirements of Table 5. 4.7 Baseline flatness The baseline flatness of the instrument is expressed by absorbance, which shall meet the requirements of Table 6. 4.8 Adaptability of power supply voltage When the fluctuation of power supply voltage is (220 ± 22) V, the change of the transmittance indication value of the instrument shall meet the requirements of Table 7.

5 General Technical Requirements

5.1 Safety performance The insulation resistance of the instrument shall be no lower than 20MΩ. 5.2 Marking The instrument should have the following markings. name, model, serial number, manufacturer's name, date of manufacture, working power supply voltage, and frequency. Domestic instruments shall have a manufacturing license mark and serial number. 5.4 Absorption tank There shall be no cracks in the absorption tank; and the light-transmitting surface shall be clean without scratches and spots.

6 Control of Metrological Instrument

The control of metrological instrument shall include initial verification, subsequent verification and in-use inspection. 6.1 Verification Conditions 6.1.1 Wavelength standard substance 6.1.2 Transmittance standard substance 6.1.2.1 0.001mol/L perchloric acid standard solution with a mass fraction of 0.06000/1000 potassium dichromate; 6.1.2.2 Ultraviolet region transmittance filter; 6.1.2.3 Spectral neutral filter, its transmittance is nominally 10%, 20%, 30%. 6.1.3 Stray light standard substance 6.1.5 Equipment for verification 6.1.5.1 Voltage regulating transformer. the output power is no less than 500W; and the output voltage is (0~250) V; 6.1.5.2 Megohmmeter. test voltage 500V, Class-10; 6.1.5.3 Multimeter. no lower than Class-2.5; 6.1.5.4 Stopwatch. the division value is no more than 0.1s. 6.1.6 Environmental conditions 6.2 Verification Items See Table 10 for the initial verification, subsequent verification and in-use inspection items of the instrument. 6.3 Verification method 6.3.1 Inspection of general technical requirements 6.3.5 Maximum allowable error of transmittance and repeatability 6.3.5.1 Verification steps 6.3.5.2 Calculation of the result Calculate the transmittance indication error according to Formula (3). 6.3.8 Stray light Select the stray light measurement standard substance specified in 6.1.3; measure the transmittance of the standard substance at the corresponding wavelength; and the transmittance value is the stray light of the instrument at the wavelength. 6.3.9 Compatibility of the absorption tank In the same optical path absorption tank attached to the instrument, put distilled water at 220nm (quartz absorption tank) and 440nm (glass absorption tank); adjust the transmittance of one absorption tank to 100%; and measure the transmittance value of other tanks. The difference is the compatibility of the absorption tank. For instruments whose transmittance range is only 0~100%, 95% can be used instead of 100%. 6.4 Processing of verification results 6.4.1 The newly-manufactured instruments shall be fully verified according to the first verification items in Table 10 of 6.2.Subsequent verification and in-use inspection shall, in principle, be carried out according to the content of the subsequent verification and in-use inspection specified in Table 10; and shall be carried out according to the requirements of the first verification, if necessary. 6.4.2 For the instruments that have passed the verification according to this regulation, a verification certificate shall be issued; and the qualification level of the instrument shall be indicated with the lowest level in the verification results. If there is one item that fails the verification items (excluding 4.10), which is judged to be unqualified; issuing a verification notice, and indicating the unqualified item. NATIONAL METROLOGICAL VERIFICATION Ultraviolet, Visible, Near-Infrared Spectrophotometers Issued on. NOVEMBER 21, 2007 Implemented on. MAY 21, 2008 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China This Regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine on November 21, 2007; and should come into effect on May 21, 2008. Administrative organization. National Physical and Chemical Metrology Technical Committee Chief drafting organization. Heilongjiang Provincial Institute of Measurement and Verification Participating drafting organization. National Institute of Metrology, China; Shanghai Precision Scientific Instrument Co., Ltd.; and Beijing Purkinje General Instrument Co., Ltd. This Regulation was entrusted to National Physical and Chemical Metrology Technical Committee for interpretation. Verification Regulation of Ultraviolet, Visible, Near-Infrared Spectrophotometers Replacing JJG 178-1996 JJG 689-1990 JJG 375-1996 JJG 682-1990 Chief drafting staffs of this Regulation. Ye Junan (Heilongjiang Provincial Institute of Measurement and Verification) Participating drafting staffs. Li Luming (National Institute of Metrology, China) Li Zheng (Shanghai Precision Scientific Instrument Co., Ltd.) Sun Hongwei (Beijing Purkinje General Instrument Co., Ltd.)

Table of Contents

1 Scope... 5 2 Normative References... 5 3 Overview... 5 4 Requirements for Metrology Performance... 6 4.1 Maximum allowable error of wavelength... 6 4.2 Wavelength repeatability... 6 4.3 Noise and drift... 7 4.4 Minimum spectral bandwidth... 7 4.5 Maximum allowable error of transmittance... 7 4.6 Transmittance repeatability... 7 4.7 Baseline flatness... 8 4.8 Adaptability of power supply voltage... 8 4.9 Stray light... 8 4.10 Compatibility of the absorption tank... 9 5 General Technical Requirements... 9 5.1 Safety performance... 9 5.2 Marking... 9 5.3 Appearance... 9 5.4 Absorption tank... 10 6 Control of Metrological Instrument... 10 6.1 Verification Conditions... 10 6.2 Verification Items... 11 6.3 Verification method... 11 6.4 Processing of verification results... 16 6.5 Verification period... 17 Appendix A Reference Wavelength of Wavelength Standard Substance... 18 Appendix B Transmittance of Potassium Dichromate Standard Solution at Different Temperatures and Different Spectral Bandwidths under Corresponding Wavelengths... 20 Appendix C Preparation Method of the Standard Solution... 21 Appendix D Verification Certificate Inner Page Format... 22 Appendix E Verification Record Format of Ultraviolet, visible and Near-Infrared Spectrophotometer... 23 Ultraviolet, Visible, Near-Infrared Spectrophotometers

1 Scope

This regulation is applicable to the initial verification, subsequent verification and in-use inspection of visible, ultraviolet-visible, ultraviolet-visible-near-infrared spectrophotometers with wavelengths ranging from 190nm to 2600nm and with continuously adjustable wavelengths.

2 Normative References

This Regulation quoted the following references. International Recommendation OIML R135 Edition 2004 Spectrophotometers for Medical Laboratories JJF 1001-1998 General Terms in Metrology and their Definitions JJF 1059-1999 Evaluation and Expression of Uncertainty in Measurement When using this Regulation, pay attention to use the effective edition of the above quoted references.

3 Overview

Ultraviolet-visible-near-infrared spectrophotometer (hereinafter referred to as the instrument) is an instrument for the quantitative analysis and qualitative identification of the substance based on the selective absorption of radiation (light) in the ultraviolet, visible and near-infrared regions by the molecules against the substance, and the Lambert-Beer law. The mathematical expression of the Lambert-Beer law is.

4 Requirements for Metrology Performance

In order to facilitate to describe the requirements for metrology performance, the working wavelength of the instrument is divided into three sections, namely Section-A (190nm~340nm), Section-B (340nm~900nm), Section-C (900nm~2600nm). According to the level of metrology performance, the instrument is divided into four levels. I, II, III, and IV. 4.1 Maximum allowable error of wavelength The maximum allowable error of the wavelength of the instrument shall meet the requirements of Table 1. 4.2 Wavelength repeatability The wavelength repeatability of the instrument shall meet the requirements of Table 2. Level Section-A Section-B Section-C 4.6 Transmittance repeatability The transmittance repeatability of the instrument shall meet the requirements of Table 5. 4.7 Baseline flatness The baseline flatness of the instrument is expressed by absorbance, which shall meet the requirements of Table 6. 4.8 Adaptability of power supply voltage When the fluctuation of power supply voltage is (220 ± 22) V, the change of the transmittance indication value of the instrument shall meet the requirements of Table 7.

5 General Technical Requirements

5.1 Safety performance The insulation resistance of the instrument shall be no lower than 20MΩ. 5.2 Marking The instrument should have the following markings. name, model, serial number, manufacturer's name, date of manufacture, working power supply voltage, and frequency. Domestic instruments shall have a manufacturing license mark and serial number. 5.4 Absorption tank There shall be no cracks in the absorption tank; and the light-transmitting surface shall be clean without scratches and spots.

6 Control of Metrological Instrument

The control of metrological instrument shall include initial verification, subsequent verification and in-use inspection. 6.1 Verification Conditions 6.1.1 Wavelength standard substance 6.1.2 Transmittance standard substance 6.1.2.1 0.001mol/L perchloric acid standard solution with a mass fraction of 0.06000/1000 potassium dichromate; 6.1.2.2 Ultraviolet region transmittance filter; 6.1.2.3 Spectral neutral filter, its transmittance is nominally 10%, 20%, 30%. 6.1.3 Stray light standard substance 6.1.5 Equipment for verification 6.1.5.1 Voltage regulating transformer. the output power is no less than 500W; and the output voltage is (0~250) V; 6.1.5.2 Megohmmeter. test voltage 500V, Class-10; 6.1.5.3 Multimeter. no lower than Class-2.5; 6.1.5.4 Stopwatch. the division value is no more than 0.1s. 6.1.6 Environmental conditions 6.2 Verification Items See Table 10 for the initial verification, subsequent verification and in-use inspection items of the instrument. 6.3 Verification method 6.3.1 Inspection of general technical requirements 6.3.5 Maximum allowable error of transmittance and repeatability 6.3.5.1 Verification steps 6.3.5.2 Calculation of the result Calculate the transmittance indication error according to Formula (3). 6.3.8 Stray light Select the stray light measurement standard substance specified in 6.1.3; measure the transmittance of the standard substance at the corresponding wavelength; and the transmittance value is the stray light of the instrument at the wavelength. 6.3.9 Compatibility of the absorption tank In the same optical path absorption tank attached to the instrument, put distilled water at 220nm (quartz absorption tank) and 440nm (glass absorption tank); adjust the transmittance of one absorption tank to 100%; and measure the transmittance value of other tanks. The difference is the compatibility of the absorption tank. For instruments whose transmittance range is only 0~100%, 95% can be used instead of 100%. 6.4 Processing of verification results 6.4.1 The newly-manufactured instruments shall be fully verified according to the first verification items in Table 10 of 6.2.Subsequent verification and in-use inspection shall, in principle, be carried out according to the content of the subsequent verification and in-use inspection specified in Table 10; and shall be carried out according to the requirements of the first verification, if necessary. 6.4.2 For the instruments that have passed the verification according to this regulation, a verification certificate shall be issued; and the qualification level of the instrument shall be indicated with the lowest level in the verification results. If there is one item that fails the verification items (excluding 4.10), which is judged to be unqualified; issuing a verification notice, and indicating the unqualified item. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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