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  • 8/12/2019 Instrument Calibration Procedure (3)


    Instrument Calibration Procedure

    Internal and External Dial, Vernier and DigitalCalipers and Outside Micrometers

    GPC CAL00DA!E 0"0#

    $EV% 0

    &ualit' Assurance Manager

    Appro(ed Date)

  • 8/12/2019 Instrument Calibration Procedure (3)



    I+!$OD C!IO+ A+D DE*C$IP!IO+

    % !-is procedure describes t-e calibration o. Internal and External Dial, Vernier and

    Digital Calipers and Outside Micrometers% !-e instrument being calibrated isre.erred to -erein as t-e !I /!est Instrument

    %1 !-is procedure includes test and essential per.ormance parameters onl'% An'mal.unction noticed during calibration, 2-et-er speci.icall' tested .or or not,s-ould be corrected%

    !able Calibration Description

    !I !IC-aracteristicsPer.ormance*peci.ication !est Met-od

    Dial, Vernierand Digital


    3ero indication test !est point 0 in%!olerance 4"5 %0006 in% Determined b' slidingt-e 7a2s toget-er andreading t-e !I

    indication%Outside accurac' $ange 0 to 18

    !olerance) see !able IIComparison to gage

    bloc9s bet2een t-e !I 7a2s%

    Inside accurac' $ange 0 to 18!olerance) see !able II

    Comparison to gage bloc9s dimensions placing t-e bloc9s

    2it- attac-ed caliper

    7a2s outside t-e !I 7a2s%Dept- gage accurac' $ange 0 to 18 Comparison to gage

    bloc9 dimensions, placing t-e !I dept-

    gage bloc9 andreading t-e !I outside

    dimension scale%OutsideMicrometers

    Lengt- and Linearit' $ange) 0 to 18 Measured b'comparing !I

    indications to gage

    bloc9 dimensionssetup to test t-e basiclengt- and

    micrometer -eadlinearit'%

  • 8/12/2019 Instrument Calibration Procedure (3)


    *EC!IO+ 1

    E& IPME+! $E& I$EME+!*

    !able 1 E:uipment $e:uirements

    Item Minimum se*peci.ications


    1% Gage ;loc9 *et $ange %0605 0

    1%1 Lo2 po2er magni.ier !o aid in reading t-e !L(ernier or barrel scale

    1%? Micrometer 2renc- Ad7ustment o. micrometer 1%< *mall 7e2elers scre2dri(er Ad7ustment o. caliper 1%6 *mall clamp @old gage bloc9s .or inside

    measurement comparison

    1%> Lig-t mac-ine oil or spra' Lubrication o. slides ort-imble1%# Clean .lat sur.ace *ur.ace Plate or *teel ;loc9

    *EC!IO+ ?


    ?% !I I+*PEC!IO+

    ?%1 Ensure t-at t-e 2or9 area is clean, 2ell illuminated, .ree .rom excessi(e dra.ts,

    .ree .rom excessi(e -umidit', and t-at t-e rate o. temperature c-ange does notexceed < oB per -our%

    ?%? Ensure t-at t-e gage bloc9 set /item 1% is clean and t-at t-e !I and t-e gage bloc9s -a(e been allo2ed to stabili e at t-e ambient temperature .or a minimumo. 1 -ours%


    ?%< Ensure t-at t-e !I 7a2s slide smoot-l' and .reel' along t-e .ull lengt- o. t-e !I beam, i. not ta9e correcti(e action%

    ?%6 Inspect to ensure t-e 7a2s are .ree o. nic9s and burrs and t-at it is clean and .ree.rom damage t-at 2ould impair its operation%

    +O!E!I test point are basicall' determined b' selecting < test point 2it-in t-e .irst inc-o. range and < to point additional test points extending o(er t-e remainder o. t-e!I range at approximatel' e:ual spacing%

  • 8/12/2019 Instrument Calibration Procedure (3)


    ?%> In order top minimi e t-e number o. gage bloc9s needed to test calipers 2it--ig-er ranges, select test point at 16, 60, #6, and 00 o. t-e !I range be'ond t-e

    st inc- and round to t-e nearest F inc-% se ma7or (ernier graduations or normalelectronic digital (alues as test points as necessar'%


    ?%# *lo2l' rotate t-e !I micrometer t-imble, and ensure t-at it operates smoot-l' itsentire range%

    ?% !-e !I lengt- measurement test s-ould be pre.ormed at approximatel' > pointsacross t-e range o. t-e !I% Bor example, 0 to 8 micrometer ma' -a(e calculatedtest points at %000, %100, %00, % 00 and %000 inc-%



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