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JJG 512-2021 English PDF

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Q: Should I purchase the latest version JJG 512-2021?

Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JJG 512-2021 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.

US$359.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email.
JJG 512-2021: (Whiteness Meter Verification Regulations)
Status: Valid

JJG 512: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJG 512-2021	359	Add to Cart	4 days	(Whiteness Meter Verification Regulations)	Valid
JJG 512-2002	719	Add to Cart	3 days	Verification Regulation of the Whiteness Meter	Obsolete
JJG 512-1987	639	Add to Cart	5 days	Verification Regulation of the Whiteness Meters	Obsolete

Similar standards

JJG 178 JJG 245 JJG 810 JJG 452 JJG 211 JJG 920

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: 18,118
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°); ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of JJG 512-2021_English be delivered?

Answer: Upon your order, we will start to translate JJG 512-2021_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of JJG 512-2021_English with my colleagues?

Answer: Yes. The purchased PDF of JJG 512-2021_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.

Question 5: Should I purchase the latest version JJG 512-2021?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JJG 512-2021 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.