Standard Briefing:Stadard ID: JJG 920-2017
Stadard Title: Diffuse Transmission Visual Densitometers
Price (USD): 399
Lead day (Deliver True-PDF English version): 4 days [Need to translate]
Status: ValidEvolution and Historical Versions:
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| JJG 920-2017 | English | 399 |
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4 days [Need to translate]
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Diffuse Transmission Visual Densitometers
| Valid |
JJG 920-2017
|
| JJG 920-1996 | English | 279 |
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3 days [Need to translate]
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Verification Regulation of diffuse transmission visual densitometer
| Obsolete |
JJG 920-1996
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Basic Data: | Standard ID | JJG 920-2017 (JJG920-2017) | | Description (Translated English) | Diffuse Transmission Visual Densitometers | | Sector / Industry | Metrology & Measurement Industry Standard | | Classification of Chinese Standard | A60 | | Classification of International Standard | 17.180 | | Word Count Estimation | 17,147 | | Date of Issue | 2017-11-20 | | Date of Implementation | 2018-05-20 | | Older Standard (superseded by this standard) | JJG 920-1996 | | Quoted Standard | GB/T 11500-2008; GB/T 11501-2008; GB/T 12823.1-2008; JJF 1001-2001 | | Regulation (derived from) | AQSIQ Notice 2017 No. 103 | | Issuing agency(ies) | State Administration of Quality Supervision, Inspection and Quarantine | Contents, Scope, and Excerpt:JJG 920-2017
(Diffuse transmission visual density meter verification procedures)
National Metrology Verification Regulations of the People's Republic
Diffuse transmission densitometer
Released on.2017-11-20
2018-05-20 implementation
The General Administration of Quality Supervision, Inspection and Quarantine issued
Diffuse transmission visual density meter verification procedure
Replace JJG 920-1996
Focal Point. National Optical Metrology Technical Committee
Main drafting unit. China Institute of Metrology
Liaoning Institute of Metrology
Guangdong Institute of Metrology
Participated in the drafting unit. Weifang City Metrology and Testing Institute, Shandong Province
This procedure entrusts the National Optical Metrology Technical Committee to explain
The main drafters of this procedure.
Liu Zilong (China Institute of Metrology)
Ai Mingze (Liaoning Institute of Metrology)
Mo Fan (Guangdong Institute of Metrology)
Chen Rui (China Institute of Metrology)
Participate in the drafters.
Han Jie (Weifang Metrology and Testing Institute, Shandong Province)
Zhu Junqing (Guangdong Institute of Metrology)
table of Contents
Introduction (II)
1 range (1)
2 References (1)
3 terms and units of measurement (1)
3.1 Transmission factor (1)
3.2 Transmission Density (1)
3.3 Diffuse coefficient (1)
3.4 indication error (1)
3.5 zero drift (1)
4 Overview (1)
5 Metrological performance requirements (2)
5.1 Measuring the most range (2)
5.2 Maximum allowable error (2)
5.3 Zero drift (2)
5.4 Repeatability (2)
6 General technical requirements (2)
6.1 Appearance (2)
6.2 Marks (2)
7 measuring instrument control (2)
7.1 Verification conditions (2)
7.2 Verification items and verification methods (2)
7.3 verification result processing (3)
7.4 Verification cycle (3)
Appendix A Geometric Mode of Diffuse Transmission Visual Density (4)
Appendix B Spectral Conditions of Diffuse Transmission Densitometer (5)
Appendix C Verification Record Format (7)
Appendix D Verification Certificate (inside page) format (8)
Appendix E Example of Measurement Uncertainty Evaluation of Verification Results (9)
introduction
This regulation is based on JJF1002-2010 "Rules for the preparation of national metrological verification procedures" for JJG 920-1996
Revision of the Diffuse Transmission Visual Densitometer. Compared with JJG 920-1996, except for editorial modifications, this procedure is mainly
The changes are as follows.
--- Increase the definition of 3.5 zero drift;
--- Explain the geometric conditions and spectral conditions in the overview;
---7.1.1 Ambient temperature (10~30) °C is changed to (23±5) °C;
---7.1.2 The density level is not less than 2, and the density level is not less than 3 levels.
Extend the measurement range of the densitometer and specify the specifications of the standard used.
Set to meet the various needs of the calibration work.
The previous versions of this procedure are released as follows.
---JJG 920-1996.
Diffuse transmission visual density meter verification procedure
1 Scope
This procedure is applicable to the first verification, subsequent verification and use of diffuse transmission visual density meter (hereinafter referred to as density meter).
In the test.
2 reference files
This procedure refers to the following documents.
GB/T 11500-2008 Photometric density measurement - Part 2. Geometric conditions for transmission density
GB/T 11501-2008 Photometric density measurement - Part 3
GB/T 12823.1-2008 Photometric density measurement - Part 1. Terminology, symbols and notation
JJF1001-2001 General measurement terms and definitions
For dated references, only the dated version applies to this Code; any undated quotation
The latest version (including all amendments) applies to this procedure.
3 terms and units of measure
3.1 Transmission factor (T) transmittancefactor
The ratio of the luminous flux Φτ through the sample to the measured luminous flux Φj after the sample is removed from the sampling hole of the measuring instrument, ie
T=
Φτ
Φj
3.2 Transmission Density (DT) transmissiondensity
The reciprocal of the transmission factor takes 10 as the base logarithm and its unit is 1.
DT=lg
T=lg
Φj
Φτ
3.3 Diffuse coefficient (βdc) diffusioncoefficient
A measure of the diffusivity of a lighting or receiving system.
See Appendix A of GB/T 11500-2008.
3.4 indication error indicationerror
The density meter value is subtracted from the standard value of the standard density sheet.
3.5 zero drift zerodrift
The indication of the transmission density at the beginning of the test until the end of the test.
4 Overview
Densitometer is one of the main instruments for measuring the optical properties of photosensitive materials. It is widely used in photography and medical X-ray diagnosis.
Industrial X-ray non-destructive testing, in industries such as molecular biology (eg, DNA sequencing, etc.).
The densitometer is mainly composed of a light source, an optical component and a receiver. The light emitted by the light source is specified by the optical component
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