1、Designation:F 92 93(Reapproved 2003)Standard Practice forDetermination of Character Yield of Inked Fabric Typewriterand Printer Ribbons1This standard is issued under the fixed designation F 92;the number immediately following the designation indicates the year of originaladoption or,in the case of r
2、evision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers the determination of the usableimage producing life of an inked fabric typewriter r
3、ibbon or aninked fabric printer ribbon expressed as the number of impres-sions obtainable from a given unit.1.2 This practice is not applicable to one-time typewriterribbons such as carbon ribbons.1.3 This practice is suitable for narrow printer ribbons witha width of 2 in.(50.8 mm)or less.1.4 The v
4、alues stated in inch-pound units are to be regardedas the standard.The SI units given in parentheses are forinformation only.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-
5、priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:D 685 Practice for Conditioning Paper and Paper Productsfor Testing2D 725 Method for Identification of Wire Side of Paper3D 3460 Specification for White
6、 Watermarked and Unwater-marked Bond,Mimeograph,Duplicator,and XerographicCut-Sized Office Papers2F 149 Terminology Relating to Optical Character Recogni-tion2F 221 Terminology Relating to Carbon Paper and InkedRibbon Products and Images Made Therefrom2F 497 Practice for Use of the Electric and Elec
7、tronic Type-writer as a Test Instrument2F 1174 Practice for Using a Personal Computer as a TestInstrument22.2ANSI Standards:PH 2.17 Density MeasurementsGeometric Conditions forReflection Density4PH 2.18 Density MeasurementsSpectral Conditions43.Terminology3.1 Definitions:3.1.1 For definition of term
8、s related to this practice refer toTerminology F 149 and F 221.3.2 Definitions of Terms Specific to This Standard:3.2.1 hot spottingprinted images produced with an inkedfabric ribbon where occasional individual images are darkerthan those around them.This condition occurs when theamount of ink is no
9、t consistent throughout the fabric ribbon.4.Summary of Practice4.1 This practice consists of testing a ribbon under simu-lated use conditions by employing a programmed electrictypewriter or computer printer to use the ribbon completely.5.Significance and Use5.1 This practice is used to determine the
10、 number of usefulimpressions obtainable under normal operating conditions of agiven typewriter or printer ribbon.It is suitable for serviceevaluation or research and development.This practice isgenerally not considered practical for manufacturing controlspecification acceptance because of the length
11、 of time requiredto obtain results.5.2 Interpretation of the test result is to be made on acomparative basis,not on the basis of absolute values.6.Interferences6.1 Different typewriters,printers,print speeds,platens,type or font styles,impact adjustments,and print modes willcause variation in result
12、s.Calibration as described in Section10 will give the same results.6.2 Type,thickness,and weight of fabric will cause varia-tions in image quality.1This practice is under the jurisdiction of ASTM Committee F05 on BusinessImaging Products and is the direct responsibility of Subcommittee F05.02 on Ink
13、edTransfer Imaging Products.Current edition approved Feb.15,1993.Published June 1993.Originallypublished as F 92 68.Last previous edition F 92 84.2Annual Book of ASTM Standards,Vol 15.09.3Discontinued 1980;replaced by D5039 in 1990.4Available from American National Standards Institute,11 West 42nd S
14、treet,13th Floor,New York,NY 10036.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.6.3 Each specimen should be tested using equal time sched-ules and equivalent environmental conditions.6.4 Ribbons with reinking systems may exhibit fluctu
15、ationsin image density that will effect the reliability of graphicanalysis as described in 14.2.6.5 Cartridge internal construction can cause variation inprint density.7.Apparatus7.1 Electronic Typewriter or Printer,that has been condi-tioned and calibrated in accordance with Sections 10 and 11 ofPr
16、actice F 497,or in accordance with Sections 9 and 10 ofPractice F 1174.7.2 Reflection DensitometerA reflection densitometermeeting the geometric conditions of PH 2.17 and the spectralconditions of PH 2.18.The specimen shall be backed with aninfinite pad of the paper.7.3 Typewriter or Printer DriverAn electro-mechanicalrobot device or computer program to activate the print mecha-nism to produce a uniform,repeatable print pattern at aconstant speed.7.4 Type Font,which produces a printed image with