10.07.2015 Views

Metrology Equipment Catalog - Rapp Industrial Sales

Metrology Equipment Catalog - Rapp Industrial Sales

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E L E C T RO N I C I N D I C ATOExternal R S, D I AMicrometersL G AG E S, P RExternalE C I S I O NMicrometersI N D I C ATO R SE L E C T RO N I C I N D I C ATO R S, D I A L G AG E S, P R E C I S I O N I N D I C ATO R SEasy-to-use, versatileWith over 50 years experience producingprecision dial gages, we offer a wide varietyof models.• Electronic indicators featuring a combined analog/digitalindication and the mostup-to-date technology.• Mechanical dial gages with high-precisionmovement, smooth pointer revolution anddouble-action shockproof mechanisms, aswell as measuring spans up to 4.0" / 100 mm.Which Style DoYou Need?• Digital indication provides error-free readoutof the measured values as the fractions of thescale divisions need not be estimated visually.• Analog indication is best suited for dynamicmeasurements, e.g. when determining axial andradial runout errors. Analog displays provide aclear, visual representation of the variations ona part being measured.Standards and DefinitionsMeasuring instruments:Electronic indicatorsDefinitions used in this section:Max. perm. errors in one measuring directionover the whole measuring rangewithin the local measuring rangein both measuring directionsRepeatability limitMax. hysteresis• Electronic indicators, precision dial gagesand dial test indicators have the capability tomeasure with the lowest possible hysteresis.Therefore, they are ideally suited for runoutinspection where this capability is required.• In order to significantly reduce the effects ofthe systematic errors, we recommend carryingout a number of comparative measurementssince only the actual size of each relatednominal length will be read out.The measuring instruments that are best suitedfor this purpose are electronic indicators, dialgages with limited range of indication andprecision indicators.• Dial test indicators (lever-type) are speciallydesigned for:– checking malleable parts due to lowmeasuring force;– inspecting hard-to-reach measuring pointswith awkward edges.Measuring instruments:Mechanical dial gagesDial test indicators (lever-type)Definitions used in this section:Deviation spanDeviation span withinthe local measuring spanTotal deviation spanRepeatability limitMax. hysteresis2020Error of a measuring instrument, µm151050-5-10-15HysteresisLocal measuring spanDownward plunger movementUpward plunger movementMax. error of indicationMax. perm. errors of indicationError of a measuring instrument, µm151050-5-10-15Deviation spanHysteresis10Local measuring spanDownward plunger movementUpward plunger movementTotaldeviation spanE-2-200 1 2 3 4 5 6 7 8 9 10(conventional) true value, mm-200 1 2 3 4 5 6 7 8 9(conventional) true value, mm<strong>Rapp</strong> <strong>Industrial</strong> <strong>Sales</strong>888 789-7277

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