8/19/2019 ISO 3599 Vernier Caliper http://slidepdf.com/reader/full/iso-3599-vernier-caliper 1/4 INTERNATIONALTANDARD rso3599-1976 E) Vernier alliperseadingo0,1and0,0b mm 1 SCOPE ND FIELD OF APPLICATION This lnternational tandard pecifieshe most important dimensional, unctional and quality characteristicsf verniercallipers eading o 0,i and 0,05 mm, with a maximum range of 1 000 mm. Methods or testing he accuracyof the instrumentsare given in an annex. for generalnformation nly. NOTE - These vernier callipers are also commonly known as l/10 and l/20 vernier call¡pers respectively- 2 NOMENCLATUREND DEFlNITIONS 2.1 For the nomenclature or vernier allipers. ee igures 1and2. 2.2 e¡¡ot of measurement:.The algebraic difference betweenhe measured ize and he true size. 2.3 measuring uncertainty The error margin correspondingo the ¡nherent rrors f measurement f a vernier alliper.t ¡s defined sbeing qualo f 2 s; .e. or a normaldistributionof the readingsn the instrument, about 95 % of readings ill not deviateromthe mean ize (true value)by more han twice he standard eviation . 3 SPECIFICATION 3-l Design eatures 3.1.1 Measuring anges For recommendedeasuringanges,ee able 1. 3.1.2 Material The mainparts of the calliper hall e of goodqualitysteel (plain arbon teel r stainlessteel). 3.1.3 Beam The beamshallbe longenough or the sliding aw assembly not to overhang when measuringat the end of the measur¡ngange. 3,1.4 Jaws Forthe minimumprojection f the aws, -¡n, see able 1. Themaximumprojection,-"", shall e equal o one-third of themeasuringange ut with a maximum f 200 mm. Thesliding aw shall be a goodsliding it along hebeam n order o permit ine adjustmento be made. Theslider hall be providedwitha suitable lampso hat t may be effectivelyclamped o the beamwithout altering the setting. For the minimum length of the faces f or internal measurement /-¡n), see able 1. The jaws may be providedwith knife edgesas shownin figure 2. The nominalcombinedwidth of the jaws for internal measurementhall be 0*. 5, 10 or 20mm. The faces or internalmeasurement except he knife-edgeaces) hallbe of cylindricalorm with a radius ot exceedingne-half f theircombined idth (see gure 1). 3.1.5 Depth-measuring evice The vernier calliper may be provided with a depth-measuring ladewhich ¡sconnectedo the slider nd allows he measurementf depthswith referenceo the end faceof the beam seeigure 2}. 3.1,6 Sca/es The beamshall be graduatedn millimetres nd he length of the scale hall eat least qual o the measur¡ngange f the calliper lus he ength f the vernier. The ength of the vernier calemay be 9, 19 or 39mm (see figures , 5 and 6). The scale ines of both the beam and he vernier hall be sharp, learandperpendicular o the edge f the beam nd their hicknesshall enot lessthan ,08mm andnot more than0,2 mm. The numbering n the beam and he vernier hallbe such that he scaleseasyo read. ' For aws w¡th knifeedges. 767
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