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JJG 512: Historical versions
| Std ID | Version | USD | Buy | Deliver [PDF] in | Title (Description) |
| JJG 512-2021 | English | 359 |
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(Whiteness Meter Verification Regulations)
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| JJG 512-2002 | English | 719 |
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Verification Regulation of the Whiteness Meter
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| JJG 512-1987 | English | 639 |
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Verification Regulation of the Whiteness Meters
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Basic data
| Standard ID | JJG 512-2021 (JJG512-2021) |
| Description (Translated English) | (Whiteness Meter Verification Regulations) |
| Sector / Industry | Metrology & Measurement Industry Standard |
| Classification of Chinese Standard | A60 |
| Word Count Estimation | 18,11 |
| Issuing agency(ies) | State Administration for Market Regulation |
JJG 512-2021: (Whiteness Meter Verification Regulations)
---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.
(Whiteness Meter Verification Regulations)
People's Republic of China National Metrological Verification Regulations
Whiteness meter
WhitenessMeters
Published on 2021-07-28
2022-01-28 Implementation
Released by the State Administration for Market Regulation
Whiteness meter verification regulations
WhitenessMeters
Replacing JJG 512-2002
Focal Point. National Optical Metrology Technical Committee
Main drafting unit. China Institute of Metrology
Shandong Institute of Metrology
Zhejiang Institute of Metrology
Participating in the drafting unit. Jiangsu Institute of Metrology
Shaanxi Institute of Metrology
Jiangxi Institute of Metrology
This specification entrusts the National Optical Metrology Technical Committee to be responsible for the interpretation
The main drafters of this specification.
Ma Yu (China Institute of Metrology)
Kong Wei (Shandong Institute of Metrology)
Ma Yao (Zhejiang Institute of Metrology)
Participating drafters.
Zhang Fan (Jiangsu Institute of Metrology)
Li Yi (Shaanxi Institute of Metrology)
Yang Yuzhe (Jiangxi Institute of Metrology)
Chen Ping (China Institute of Metrology)
content
Introduction (Ⅱ)
1 Scope(1)
2 References (1)
3 Terms and units of measurement(1)
4 Overview(1)
5 Measurement performance requirements (2)
5.1 Work Whiteboard(2)
5.2 Whiteness meter(2)
6 General technical requirements (3)
7 Measuring Instrument Control(3)
7.1 Verification Conditions (3)
7.2 Verification items (3)
7.3 Verification method (4)
7.4 Processing of Verification Results (5)
7.5 Verification Period(5)
Appendix A Raw Record Format(6)
Appendix B Whiteness Meter Verification Certificate (Inner Page) Format (7)
Appendix C Example of Uncertainty Evaluation of Measurement Results(8)
Appendix D Geometry of Colorimetric Measuring Instruments Specified by the International Commission on Illumination (CIE) (10)
Appendix E Several commonly used whiteness calculation formulas (12)
Introduction
JJF1002 "Rules for the Compilation of National Metrological Verification Regulations", JJF1001 "General Metrology Terms and Definitions",
JJF1059.1 "Evaluation and Expression of Measurement Uncertainty", JJF1032 "Terms and Definitions of Optical Radiation Metrology"
Together, they constitute a basic series of specifications supporting the revision of this Regulation.
This regulation replaces JJG 512-2002 "Whiteness Meter". Compared with JJG 512-2002, except for editorial changes, the main
The technical changes are as follows.
--- Changed the reference file;
--- Changed terminology;
--- Added a schematic diagram to the overview section;
---In the measurement performance requirements, the standard whiteness meter and performance indicators have been added;
---In the control of measuring instruments, the standard-grade whiteness meter is added to the equipment for verifying the working whiteboard; the verification whiteness meter
The series of standard whiteboards have been increased from the original set of 2 to a set of 4, and the range of 380nm~780nm has been increased.
The average radiance factor within the range has been modified, and the difference between the average radiances of adjacent series of standard whiteboards has been increased.
Regulation;
--- The "check of light source" has been removed from the verification item;
---In the verification method, the method of using a standard-grade whiteness meter to verify the whiteness value of the working whiteboard is added; use a set of
The measurement results of a series of 4 standard whiteboards calculate the indication error, and the number of repeated measurements for each standard whiteboard is modified by 6 times
3 times; in the repeatability measurement, the number of measurements was changed from 6 times to 8 times;
--- Modified Appendix A "Original Record Format";
---Modified Appendix B "Whiteness Meter Verification Certificate (Inner Page) Format";
--- Modified Appendix C "Example of Uncertainty Evaluation of Measurement Results";
--- Added Appendix D "Geometric Conditions of Colorimetric Measuring Instruments Specified by the International Commission on Illumination (CIE)";
--- Revised Appendix E "Several Common Whiteness Calculation Formulas".
The previous versions of this regulation have been released as follows.
---JJG 512-1987;
---JJG 512-2002.
Whiteness meter verification regulations
1 Scope
This regulation applies to newly manufactured, in-use and repaired photoelectric integrating blue light whiteness meters (hereinafter referred to as whiteness meters).
or instrument) for the first verification, subsequent verification and in-use inspection. The verification of spectrophotometric whiteness meter can refer to this regulation
Procedure. This regulation does not apply to the verification of fluorescent whiteness meters or fluorescence measurement results of whiteness meters.
2 Reference documents
This procedure cites the following documents.
JJG 178-2007 Ultraviolet, Visible, Near Infrared Spectrophotometer
JJG 453-2002 Standard Swatches
JJG 595-2002 Colorimeter
GB/T 3978-2008 Standard Illuminator and Geometric Conditions
GB/T 3979-2008 Measurement method of object color
For dated citations, only the dated version applies to this Regulation; for undated citations
The latest version (including all amendments) applies to this regulation.
3 Terminology and units of measurement
3.1 Whiteness
A measure of the color properties of diffuse surfaces with high (light) reflectance and low color purity, in units of 1.
3.2 Blue light whiteness bluewhiteness
The relative spectral distribution function of the instrument (the comprehensive spectral response of the light source, optical system, and detection system) has
Measured on a reflective sample with an effective peak wavelength of 457 nm and a half-width of 44 nm.
Note.
1 For the calculation formula of blue light whiteness, see E.1 in Appendix E.
2 Unless otherwise specified, the "whiteness" in each article of this Regulation refers to the blue light whiteness; the blue light whiteness is usually expressed as Wb or
R457 indicates that the blue light whiteness is represented by abbreviated "W" in this regulation (except E.1 and E.2 of Appendix E).
3.3 radiance factor radiancefactor
The radiance of a non-spontaneous radiating medium surface element in a specified direction is the same as that of an ideal diffuse reflector under the same illumination conditions
ratio of brightness. The symbol is βe or β, and the unit is 1.
4 Overview
The whiteness meter is composed of a light source, an optical system, a detection system, a data processing and display system, etc., and is generally equipped with a black tube.
and work whiteboard. After the whiteness meter is calibrated by the black tube and the working whiteboard, the zero point and the whiteness value are respectively calibrated, and the whiteness of the sample is measured.
degree value.
Figure 1 is a schematic diagram of the optical principle of a whiteness meter with a geometric condition of diffusion. 8° (symbol de. 8° or di. 8°);
...
