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GA/T 1690.4-2019 English PDF

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GA/T 1690.4-2019: Forensic sciences -- Examination methods for seal stamps -- Part 4: Measurement and comparison
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PDF similar to GA/T 1690.4-2019


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Basic data

Standard ID GA/T 1690.4-2019 (GA/T1690.4-2019)
Description (Translated English) Forensic sciences -- Examination methods for seal stamps -- Part 4: Measurement and comparison
Sector / Industry Public Security (Police) Industry Standard (Recommended)
Classification of Chinese Standard A92
Classification of International Standard 13.310
Word Count Estimation 6,668
Date of Issue 2019-10-14
Date of Implementation 2019-12-01
Issuing agency(ies) Ministry of Public Security

GA/T 1690.4-2019: Forensic sciences -- Examination methods for seal stamps -- Part 4: Measurement and comparison


---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.
Forensic sciences - Examination methods for seal stamps - Part 4.Measurement and comparison ICS 13.310 A92 Public Safety Industry Standard of the People's Republic of China Forensic science seal seal inspection Part 4.Measurement comparison method Published on October 14,.2019 2019-12-01 Implementation Issued by the Ministry of Public Security of the People's Republic of China

Foreword

GA/T 1690 "Forensic Science Seal Seal Test" is divided into 6 parts. ---Part 1.Microscopic inspection method; ---Part 2.Coincidence comparison method; ---Part 3.Detailed feature comparison method; ---Part 4.Measurement comparison method; ---Part 5.Splicing comparison method; ---Part 6.Line drawing comparison method. This part is part 4 of GA/T 1690. This section was drafted in accordance with the rules given in GB/T 1.1-2009. This part is proposed by the Sub-Technical Committee of National Criminal Technology Standardization Technical Committee (SAC/TC179/SC10) and Be in charge. This section was drafted by. Tianjin Public Security Bureau, Physical Evidence Appraisal Center of the Ministry of Public Security, Daqing Public Security Bureau. The main drafters of this section. Yu Jianmin, Gao Yuan, Wang Xiaoguang, Jiang Zhongjiao, Zhao Yuanxiang, Hou Jianzhong. Forensic science seal seal inspection Part 4.Measurement comparison method

1 Scope

This part of GA/T 1690 stipulates the method specification for measuring seals by the measurement and comparison method in the field of forensic science. This section applies to the inspection of seals and seals in the field of forensic science.

2 Equipment

Ruler, triangle ruler, compass, etc.; scanner, graphics (image) processing software, other software with measurement functions, etc.

3 Inspection

3.1 Indian text measurement 3.1.1 Measuring principle In general, the original of the printed text should be directly measured; it can also be used under the same image resolution conditions with the measurement function 'S software measures the pictures of the printed text. 3.1.2 Measurement content The measurement content includes. a) Length. the diameter of the printed text, the length of the side, the length between two points, the width of the frame; the length of the arc, etc. b) Angle. 3.1.3 Measurement method Measurement methods are. a) Length measurement. select several clear and stable feature points in the printed text, measure the length between any two points, or the length of an arc. b) Angle measurement. select several clear and stable feature points in the printed text, connect any three points to form an angle and measure. 3.2 Comparison inspection Compare measured values at the same location.

4 Make inspection records

Record the test results of the measurement comparison in the test record. If necessary, you can place a picture of the measurement location and text description.

5 matters needing attention

5.1 The same measurement tool should be used to measure and compare the physical quantities at the same location.

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