AS/NZS 4578:1999
Micrographics - Readers for transparent microforms - Measurement of characteristics
Specifies methods and instruments for measuring the characteristics for readers specified in AS/NZS 4577:1999 (ISO 6198). It applies to magnification, resolution, distortion, screen luminance, screen contrast and film gate temperatures. This Standard is identical with and has been reproduced from ISO 7565:1993.
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AS/NZS 4578:1999 MICROGRAPHICS - READERS FOR TRANSPARENT MICROFORMS - MEASUREMENT OF CHARACTERISTICS
PREFACE
CONTENTS
1 Scope
2 Normative references
3 Definitions
4 Magnification
4.1 Apparatus
4.1.1 Magnification test target
4.1.2 Graduated reference scale
4.1.3 Magnifier
4.2 Procedure
5 Resolution
5.1 Test charts
5.1.1 ISO No. 1 microtest chart
5.1.2 ISO No.2 test chart
5.2 Magnifier
5.3 Procedure
6 Geometric distortion
6.1 Test film
6.2 Procedure
6.2.1 Curvilinear distortion (barrel, pincushion)
6.2.2 Geometric distortion (keystone)
6.2.3 Geometric distortion (skew)
7 Screen luminance
7.1 General conditions
7.1.1 Apparatus
7.1.2 Operation of reader being measured
7.1.3 Location of screen measurement positions
7.2 Procedure
7.2.1 Rear-projection readers
7.2.2 Front-projection readers
8 Screen contrast
8.1 Apparatus
8.1.1 Meters
8.1.2 Test mask
8.1.3 Location of contrast measurement points
8.2 Screen contrast measurements
8.2.1 Operation of reader
8.2.2 Meter position
8.2.3 Procedure
9 Film gate temperature measurements
9.1 Apparatus
9.1.1 Thermocouple and test film
9.1.2 Thermometer for measuring ambient temperature
9.2 Procedure
Annex A - Importance of the luminance measurement
A.1 Screen characteristics
A.2 Screen observation
A.3 Evaluation of screen diffusion characteristics
Annex B - Field method using a luxmeter
B.1 Presentation
B.2 Method
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AS/NZS 4578:1999 MICROGRAPHICS - READERS FOR TRANSPARENT MICROFORMS - MEASUREMENT OF CHARACTERISTICS
PREFACE
CONTENTS
1 Scope
2 Normative references
3 Definitions
4 Magnification
4.1 Apparatus
4.1.1 Magnification test target
4.1.2 Graduated reference scale
4.1.3 Magnifier
4.2 Procedure
5 Resolution
5.1 Test charts
5.1.1 ISO No. 1 microtest chart
5.1.2 ISO No.2 test chart
5.2 Magnifier
5.3 Procedure
6 Geometric distortion
6.1 Test film
6.2 Procedure
6.2.1 Curvilinear distortion (barrel, pincushion)
6.2.2 Geometric distortion (keystone)
6.2.3 Geometric distortion (skew)
7 Screen luminance
7.1 General conditions
7.1.1 Apparatus
7.1.2 Operation of reader being measured
7.1.3 Location of screen measurement positions
7.2 Procedure
7.2.1 Rear-projection readers
7.2.2 Front-projection readers
8 Screen contrast
8.1 Apparatus
8.1.1 Meters
8.1.2 Test mask
8.1.3 Location of contrast measurement points
8.2 Screen contrast measurements
8.2.1 Operation of reader
8.2.2 Meter position
8.2.3 Procedure
9 Film gate temperature measurements
9.1 Apparatus
9.1.1 Thermocouple and test film
9.1.2 Thermometer for measuring ambient temperature
9.2 Procedure
Annex A - Importance of the luminance measurement
A.1 Screen characteristics
A.2 Screen observation
A.3 Evaluation of screen diffusion characteristics
Annex B - Field method using a luxmeter
B.1 Presentation
B.2 Method
AS/NZS 4578:1999
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