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GB/T 8987-2008Micrographics - Test target for checking optical density of negative microimages in microfilming (English PDF)

缩微摄影技术缩微摄影时检查负像光学密度用测试标板

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

July 16, 2008

Implementation date

January 1, 2009

Scope

GB/T 8987-2008 is the English-translated version of 缩微摄影技术缩微摄影时检查负像光学密度用测试标板.

GB/T 8987-2008 is the Chinese national standard for the test target for checking the optical density of negative micro-images in microfilming.

It defines an A4 target board of 297 mm by 210 mm carrying four grey areas and a reduction scale (10 ± 1) mm wide and (100 ± 1) mm long, and gives the value each area must have: one of 80% reflectance, equal to a diffuse density D457 of 0.071 to 0.097, one of 6% ± 0.4%, equal to 1.194 to 1.252, and two of 50% ± 3%, equal to 0.276 to 0.328, all read through a filter centred on 457 nm with light source A. It covers 16 mm and flatbed A6 microfiche cameras, not rotary cameras or COM recorders.

It replaces GB/T 8987-1988, was issued on 16 July 2008 and has applied since 1 January 2009.

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Document preview — GB/T 8987-2008

National Standard of the People's Republic of China

ICS: 37.080
Classification: A 14
Replacing: GB/T 8987-1988

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword
1 Scope
2 Normative references
3 Terms and Definitions
4 A4 format density test target

Foreword

This standard replaces GB/T 8987-1988 "check Micrographics Micrographics negative image optical density Test target." This standard and GB/T 8987-1988 compared to major technological changes as follows.

--- Increased shall GB/T 12356-2008 "Micrographics 16mm microfilm camera platform with a special test target Sign and use the "shooting a frame of another explanation;

--- Amend the provisions of this standard method of using standard plate instructions.

1 Scope

This standard specifies the test target and method of use to check microfilming negative images with optical density.

This standard applies to 16mm microfilm camera platform A6 microfiche and microfilm camera microfilming.

This standard does not apply to Rotary COM microfilm camera and recorder.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.

GB/T 6159.1-2003 Micrographics - Vocabulary - Part 1: General terms (ISO 6196-1:1993, MOD)

GB/T 6159.6-2003 Micrographics - Vocabulary - Part 6: Equipment (ISO 6196-6:1993, MOD)

GB/T 6159.7-2000 Micrographics - Vocabulary Part VII. Computer Micrographics (eqv6196-7.1992)

GB/T 6159.8-2003 Micrographics - Vocabulary - Part 8: Application (ISO 6196-8:1998, MOD)

GB/T 12356-2008 Micrographics 16mm microfilm camera platform Test target characteristics and use

3 Terms and Definitions

GB/T 6159.1-2003, GB/T 6159.6-2003, GB/T 6159.7-2000 and GB/T 6159.8-2003 established The terms and definitions apply to this standard.

4 A4 format density test target

4.1 General

A4 format density test target format for the A6 by four gray area and a shrinkage scale test configuration, the layout shown in Figure 1.

4.2 Gray zone

Four A6 format of the gray zone should have the following respective reflectance or optical density.

--- A gray zone of reflectivity of R457 = 80% + 5%, equivalent to the density of the diffuse reflection D457 = 0.071 ~ 0.097;

--- A gray zone of reflectivity of R457 = 6% ± 0.4%, equivalent to the density of the diffuse reflection D457 = 1.194 ~ 1.252;

--- Two remaining gray regions reflectivity of R457 = 50% ± 3%, the diffuse reflectance density is equivalent to D457 = 0.276 ~ 0.328.

NOTE: R457 and D457 shows measured reflectance or diffuse reflection density, color filter used for the wavelength of the light passing through the center of 457nm, measured as A light source.

4.3 Feet shrinkage test

Shrinkage test foot width should be (10 ± 1) mm, the length shall be (100 ± 1) mm, and press mm divided scale.

4.4 Standard board size

A4 format density test target dimensions shall be 297mm × 210mm.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

Cited by

GB/T 12356-2008Micrographics - 16 mm planetary cameras - Test target for checking performance

Similar standards

GB/T 47865-2026|GB/T 15737-2014|GB/T 12355-2008|GB/T 12356-2008|GB/T 17292-2008|GB/T 13967-2026

Editions of GB/T 8987

Edition	Title	Revision	Status
GB/T 8987-2008	Micrographics - Test target for checking optical density of negative microimages in microfilming	current edition	Current
GB/T 8987-1988	Micrographics - Test target for checking optical density of negative microimages in microfilming	previous edition	Superseded

This page sells the current edition, GB/T 8987-2008. Earlier editions are listed for reference only.

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