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JJF 1751-2019 English PDF

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JJF 1751-2019: Calibration Specification for Colony Counters
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Basic data

Standard ID JJF 1751-2019 (JJF1751-2019)
Description (Translated English) Calibration Specification for Colony Counters
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A50
Classification of International Standard 17.020
Word Count Estimation 12,133
Date of Issue 2019
Date of Implementation 2019-12-27
Issuing agency(ies) State Administration for Market Regulation

JJF 1751-2019: Calibration Specification for Colony Counters

---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.
Calibration Specification for Colony Counters National Measurement Technical Specification of the People's Republic of China Colony Counter Calibration Specification 2019-09-27 release 2019-12-27 Implementation Issued by the State Administration of Market Supervision and Administration Colony Counter Calibration Specification Focal point. National Biometrics Technical Committee Main drafting unit. Guangdong Institute of Metrology Participated in the drafting unit. China Academy of Metrology This specification entrusts the National Biometrics Technical Committee to interpret The main drafters of this specification. Jia Rui (Guangdong Institute of Metrology) Chen Ling (Guangdong Institute of Metrology) Participating drafters. Zhang Ling (Chinese Academy of Metrology) Bao Zhijuan (Guangdong Institute of Metrology) Ye Jing (Chinese Academy of Metrology)

table of Contents

Introduction (Ⅱ) 1 Scope (1) 2 References (1) 3 Terminology (1) 4 Overview (1) 5 Metrological characteristics (1) 5.1 Indication error (1) 5.2 Repeatability (1) 5.3 Discrimination (1) 5.4 Color temperature (1) 5.5 Resolution (1) 6 Calibration conditions (2) 6.1 Environmental conditions (2) 6.2 Calibration reference materials and other equipment (2) 7 Calibration items and calibration methods (2) 7.1 Indication error (2) 7.2 Repeatability (2) 7.3 Discrimination (3) 7.4 Resolution (3) 7.5 Color temperature (3) 8 Expression of calibration results (3) 9 Recalibration time interval (3) Appendix A. Recommended Format on the Inner Page of the Calibration Certificate (4) Appendix B Original Record Format (Reference) (5) Appendix C Examples of Uncertainty Evaluation of Measurement Results of Instrument Indication Error (6)

Introduction

This specification mainly refers to GB/T 20733-2006 "Digital Camera Terminology", CIPA DC-003- Translation-2003 "Measurement Method of Digital Camera Resolution" and GB 4789.2-2016 "Food Safety Country" Home Standard Food Microbiology Inspection Colony Determination ", based on JJF 1071-2010" National Measurement and Calibration Regulations "Fan writing rules" requirements. This specification is the first release. Colony Counter Calibration Specification

1 Scope

This specification is applicable to a scanning imaging system, which is processed according to the imaging results and can be automatically counted. Calibration of the colony counter to the counting result. For other types of colony counters, refer to this specification.

2 Reference documents

This specification refers to the following documents. JJF 1059.1 Evaluation and expression of measurement uncertainty GB 4789.2-2016 National Food Safety Standard Determination of the total number of colonies in food microbiology inspection GB/T 20733-2006 Digital camera terminology CIPADC-003-Translation-2003 Digital camera resolution measurement method ISO 12233..2000 Photographic Electronic Still Camera Resolution Measurement (Photography-Electronic stil-picturecameras-Resolutionmeasurements) For dated reference documents, only the dated version applies to this specification; for those without date references The latest version (including all amendments) is applicable to this specification.

3 Terminology

3.1 resolution A measure of the ability of a digital image capture system or digital image capture system component to resolve spatial image details. 3.2 Discrimination detectionlimited The ability of the colony counter to identify the smallest colony is expressed by the diameter of the smallest colony that the instrument can identify.

4 Overview

The colony counter (hereinafter referred to as the instrument) is an instrument that automatically analyzes and counts the colonies on the treated plate It is mainly composed of image capturing system (mainly including light source and CCD image sensor), image processing system and counting Display equipment, etc. When analyzing, first use a color image sensor to obtain the plate image, and then use professional software The colony on the image is processed, and the processed image is subjected to statistical analysis of the colony by the counting system to obtain the plate The total number of colonies.

5 Metrological characteristics

5.1 Indication error 5.2 Repeatability 5.3 Discrimination 5.4 Color temperature 5.5 Resolution

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