JJG 178-2007 PDF English
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JJG 178-2007: Verification Regulation of Ultraviolet, Visible, Near-Infrared Spectrophotometers
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/JJG178-2007
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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