1、A.E.C.M.A. STANDARD prEN21559NORME A.E.C.M,A. Edition 1A. E.C.M.A. NORM June 1981ll?NwG:0:f Vl2oUVlWoU.JzZwWtl.o0:wzoUoa:ec:Ucns Shall l)e flCQ of scratohes, blc;iich,H11ld.visibly tJ.istinctincelllflvolds and partioles, unleso His spcoificclly desired to measureJhocontribu:tion to hrzo dll.() to th
2、ose imperfections. r:ibo effect of snrft,occ1.cfeotG mcy be climlno:led by immersing the spooimen in aclclicilid oftl10 lJ:J:1e rcfrc.ct.j, vl: i nd ex. .4,2 DimensionsThe tes t specimens shall be 35 mm in diameter, minimum, and small enough tobe tangent to the sphere wall, The thickness of the test
3、 specimen shall beas furnished, or for comparative purposes, shall be 3 0,1 mm.prEN2155-9 Page 55 PROCEDUREReadings. Determine the following four values for a givenlocation on a specimen :Reading Specimen Light trapReflectionstandard Quantity representeddesignation in position in positionin position
4、T1No No Yes Incident lightTzYes No Yes Total light transmittedby specimenTJNo Yes No Light scattered byInstrumentTYes Yes No Light scattered byInstrument and specimen6 EXPRESSION OF RESULTS6.1 Haze. Calculate percentage haze as follow- (TT42Haze, per centT3)100T16.2 Per cent haze shall be expressed
5、to nearest 0,1%.6.3 Thickness of specimen shall be measured in millimetresto nearest 0,02 mm.7 TEST REPORTThe test report shall include7.1 Thickness of specimen,7.2 % haze.“- Supply volt890prEN215S-9 Page 6Roflector(ADJILamp -BaseCondonslng IonsCollimator tuboSpringretainerGalvanometer-and scaloFIGU
6、RE 1 - HelometerIntegrltlon sphereReflectancesumdard.:c=:J._- Light trap-PhotocellSpringf=:=-retalnar-,TransformerPivot on whichsphare Is rotatodPhotocellCondonorSourCilFilterEntranoeArtureLensSpecimenDotted lines show position of sphorefor total transmission mOlSuromentsFIGURE 2 - Plvotablo-sphere halometer
