ASTM_F_807_-_83_2003.pdf

Designation:F 807 83(Reapproved 2003)Standard Practice forDetermining Resolution Capability of Office Copiers1This standard is issued under the fixed designation F 807;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers the description and method of usefor a resolution test target for office copier evaluation.1.2 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-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2F 335 Terminology Relating to Electrostatic CopyingF 360 Practice for Image Evaluation of Electrostatic Busi-ness Copies2.2American National Standard:PH2.33 Method for Determining the Resolving Power ofPhotographic Materials33.Summary of Practice3.1 The standard test target is described for evaluation ofresolution.Resolution is stated in line pairs per millimetre.Themethod of evaluation using this target is given.4.Significance and Use4.1 The resolution of a copying process is affected by manyfactors including the copier,supplies,and environmental con-ditions.The resolution is particularly significant relative tosharpness,edge definition,and the ability to visually distin-guish the separation of fine lines.4.2 The standard test target for image resolution may beused in evaluation of the factors mentioned in 4.1.5.Apparatus5.1 Magnifier,103.6.Materials6.1 A test target4for the evaluation of image resolution.7.Precautions7.1 This test target can be used to measure image resolutionfor different copier conditions(machine adjustments,machineconfigurations,supplies,environment,etc.).Careful notationshould be made so that comparison tests can be made.7.2 The copy contrast may affect the resolution measure-ments.If exposure control is available,it should be optimized.Guidelines are given in ANSI PH2.33.7.3 The surface quality of the copy paper may affect theresolution measurements.7.4 Resolution may differ with direction of line pair set.8.Procedure8.1 Use the test target in accordance with Section 5 ofPractice F 360.9.Interpretation of Results9.1 Measurement of Image Resolution:9.1.1 Using the magnifier,determine the smallest line pairtarget in each target set that can be resolved.Record thesevalues noting the target set positions.The line pair target isconsidered resolved when the lines(and spaces)are visiblyseparate.9.1.2 Interpretation of results should be made by oneobserver.9.1.3 Overall copy resolution can be determined by math-ematical averaging the line pairs per millimetre values obtainedin accordance with 9.1.1 on the five targets of a single copy.The range of values should be noted as this gives an indicationof consistency within one copy.9.1.4 Away from the center of the field,the resolution of thebars directed toward the center is often not equal to theresolution perpendicular to that direction because of lensaberrations or other machine configurations.If the patternsperpendicular to one another are not equally resolved at thecenter of the field,one should suspect vibration or other imagemotion with respect to the photoconductor.1This practice is under the jurisdiction of ASTM Committee F05 on BusinessCopy Products and is the direct responsibility of Subcommittee F05.04 onElectrostatic Copy Products.Current edition approved Oct.26,1983.Published December 1983.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from theAmerican National Standards Institute,11 W.42nd St.,13thFlr.,New York,NY 10036.4Available from Applied Image Co.,1653 E.Main St.,Rochester,NY 14609.Request test target referenced in Practice F 807.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.10.Precision and Bias10.1 The results are reproducible for one observer and oneset of test conditions(machine,supplies,temperature,humid-ity,etc.).The results may not be comparable between observ-ers.A reproducible ranking order can be established.Thisstatement is based on experience with the resolution target inmany laboratories.11.Keywords11.1 copier;resolution;sharpness;suppliesASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard.Users of this standard are expressly advised that determination of the validity of any such patent rights,and the riskof infringement of such rights,are entirely their own responsibility