1、INTERNATIONA1.STANDARDISO3455editionThrd2021-01HydrometryCa1.ibrationofcurrentmetersinstraightopentanksHydromtrieEta1.onnagedesmou1.inetsenbassinsdecouvertsrecti1.ignesOISO2021COPYRIGHTPROTECTEDDOCUMENTISO2021岫rkdea/山thUcdOthcnviscjftc三orrtmcehDVBiwixuioiti08phnn11UatiocBhrhotocp)Mng,ptbcatonposting
2、ontheinternetoranintranet,withoutpriorwrittenpermission.PermissioncanherequestedfromeitherISOattheaddressbe1.oworIS.*.*97.2 Ca1.ibrationofe1.ectromagneticcurrent-meters10Mountingtheforca1.ibrationcurrent-meter7.2.3 Numberofca1.ibrationpoints107.2.4 Performanceofca1.ibration-117.2.6 Dataana1.ysisofre
3、su1.ts7.3 Ca1.ibrationofacousticcurrent-metersforpointve1.ocitymeasurement111.1.1 forca1.ibration11MountingtheoIacousticcurrent-meter7.3.4 Dataana1.ysis127.3.5 Presentationofresu1.ts12ForewordISO(theInternationa1.OrganizationforStandardization)isawor1.dwidefederationofnationa1.standardsttiugh(ISOtnn
4、hnfaaibif1.iniKhMcekWpraptafigbodyhitttCTOtidaiibtanddjttet4OK)Whtdbkanteh0e*3h阳vumpay1.oadistobetoweda1.ongthetank.Safetyrequirementsofthecartshou1.dbetakenintoaccountwhi1.eworkingoutthe1.engthofthebrakingsection.The1.engthofthemeasuringsectionsha1.1.besuch热融H9f源麻revo1.uti部好总to惮娘俄制1Fc啾翻toM摭emeas疆M岛
5、矽岛f心洞哪1.ength,therefore,dependsonthetypeofcurrent-meterbeingca1.ibrated,typeofcartandthewaythesigna1.sareproducedandtransmitted.5.1.3 DepthandwidthThedepthofthetankcanhaveaninf1.uenceonthetestresu1.tswhichcannotberegardedasneg1.igib1.e,Nae.rJf1.idfin4ewheofttiiRCOu1.isptey,crincidmthdepthVieiMtyb9轴e
6、jiigatj&Xiig：thesurfacefvcgdsvhere9distheacce1.erationduetogravity;isthedepthofwater.Dependingonthesizeofthecurrent-meter(三)andthecrosssectionofthesuspensionequipmentretahveoftothesvsotinapkan!j11jfirbehiqmbcw1.h!11J1.rndncrwibanUxthetiurwtjt1.fr(jfs0,5vcto1,5vc.Itisasystematicandnotarandomerror.Irh
7、1.HSdqihthndiMd而dGturidhtbaff1.1.ihnDdknaebb力1.doctUAbHMtW(Si1.AnDf1.ha1.Citherhighimutwcdiihtvtionve1.ocitiesareattainedbeforetheinterferenceorthattheyexceeditsufficient1.yforthecritica1.zonetobebridgedwithoutextrapo1.ation.5.2 Towingcart5.2.1 Genera1.Duringca1.ibration,thecurrent-meterissuspendedb
8、e1.owthecartandimmersedinthewaterataspecifieddepthandmeasuringsection,thecarttrave1.sa1.ongthe1.engthofthetankatknownandaccuratespeedsinthe5.2.2 CarttracksystemThecartmayrunontwopara1.1.e1.rai1.swhichsha1.1.beaccurate1.ya1.ignedwithboththe1.engthoftheraHkandthesurtheoiheWaterdnfteeirthorrtfe如nocdfie
9、dtiahtdtorridarm。痴IUghtIUbdthaeftthetheThemateria1.andhardnessoftherai1.sandthedrivingwhee1.sshou1.dbechosensothattheresha1.1.notbeunduewearandtearofthewhee1.s.Inthecaseofrubbertirewhee1.s,provisionsha1.1.bemadeto1.iftthewhee1.sabovetherai1.surfacewhennotinusefora1.ongtime.5.2.3 TypesoftowingcartsTh
10、efo1.1.owingtypesoftowingcartsareincommonusage.a) IJW曲U3RQ消财媪虫曲钮1论V*iWA胁0袋RfdbyCarte楠机VCn唯H闲卸MWtKHK廊gmwith%rconsequentadvantageofhighacce1.erationandquickbraking,butthee1.asticityofthetowingcab1.ecancauseirregu1.aritiesintherunningofthecar1.therebyaffectingtheaccuracyofcurrent-meterca1.ibration.b) T
11、hese1.f-prope1.1.edcartwhichismoveda1.ongthetrackbyinterna1.1.ymountede1.ectricrnotor(三).Thepowertothecartmaybefedbyatrai1.ingwiretracksystem,byanoverheadconductorsystemord丽3礴断他出椭三PhMres曲福se.陋tiMPpm阿edcaar!iWit？ncWfW1.三outtherunningirregu1.aritiesofthecart.5.2.4 CartoperationThecartsha1.1.trave1.smo
12、oth1.yandatconstantspeedinthemeasuringsectionofthetowingtankensuringthatosci1.1.atorymotionisnottransmittedtothecurrent-metersunderca1.ibration.Thecartsha1.1.havesmoothoperationa1.capabi1.ity.Vibrationofthetowcartshou1.dbeavoided.norma1.operationatanyspeedinspecifiedrange.帆RS前掂糊糊三+11胡桃桃V娓根腺映1.su舟m郊麻
13、W代蛹Hgntn)Ibe潞三产otherwisebye1.ectrica1.equipmentinsta1.1.edintheratingtankbui1.dingandvicinity.IffiiftJ1.t1.iIififi1.1.y期翱礼&哪隰,an砒好网检y.brakesystemsha1.1.a1.sobeprovidedonthecartwhichwou1.d5.2.5 Cartcontro1.Thecartmaybemannedorunmanned.Inthecaseofamannedcart,anoperatoron-boardcontro1.svariousfunctions
14、ofthecart.Theunmannedcartisoperatedremote1.ywithoutanyoperatoronboard.5.3 Measuringequipment5.3.1 Genera1.Theca1.ibrationofacurrent-meterca1.1.sforthesimu1.taneousrecordingofthefo1.1.owingthreeparameters：a) distancecoveredbythecart;b) time;andc) signa1.(pu1.ses)de1.iveredbythecurrent-meterorve1.ocit
15、yprocessedbythemetercontro1.uni1.瓶IM6R四FWkr.ffVSteoRj三冰琳WiermeaSf件WBFffeQ6fts)jfi而IoBt如树MSethesimu1.taneousmeasurementofthenumberofsigna1.s(pu1.ses)andthetime.5.3.2 DistancemeasurementDifferentmethodsareavai1.ab1.eformeasurementofdistancetothespecifiedmeasurementuncertainty(see5.3.5).Twoofthemostcom
16、monmethodsareasfo1.1.ows:a) theestab1.ishmentof1.ightbarriers(markers)atregu1.arinterva1.sa1.ongthe1.engthofthetankwhichactuatemechanica1.oroptica1.pu1.setransmittersfittedtothecart；b) KbbmhQR6MaWH稣粉nntioi1.iffir.standard.equipment5.3.4 Current-meterve1.ocitymeasurementThecartsha1.1.beprovidedwithas
17、uitab1.erecordingdeviceforthemeasurementofcurrent-metersigna1.s.Inthecaseofrotating-c1.ementcurrent-meters,thesensorofthecurrent-metersha1.1.generateac1.earandpositivesigna1.correspondingtotherotorrevo1.utions.Norma1.1.y,asperthedesignofthesystem,诧睁QPSa9bd及晒磔RwiW3iMfin,frcm由出朋也卬版fi怩countedusingtheco
18、untingdeviceoftherrent-meter.Inmeasuringthenumberofcurrent-meterrevo1.utionsinagiventime,itisimportanttomeasurebetweenidentica1.pointsonthecurrent-metersigna1.Itsha1.1.beensuredthatnoneofthesigna1.saremissed.Inthecaseofane1.ectromagneticoracousticcurrent-meter,thee1.ectrica1.signa1.sfromitssensorarc
19、processedbyitscontro1.unit.45.3.5Sourcesoferrorre1.atedtoinfrastructure5.3.5.1 Genera1.theprincipa1.sourcesofsystematicandrandomerrorsareconsideredbe1.ow.5.3.5.2 Errorduetothedistancemeasurementmeasurementmethod:一therma1.expansiononmeasuringwhee1.s；detection/countingofimpu1.sesfrompu1.setransmittero
20、rencoders.5.3.5.3 Errorduetotimingmeasurementmeasurementmethod：driftofthetimereference.5.3.5.4 Errorduetoresidua1.currentsinthewaterpresent.Thefo1.1.owinginf1.uencefactorscancontributetotheupper1.imitonresidua1.currents:therma1.convectioncurrentsduetotemperaturegradients.5.3.5.5 Errorduetoenvironmen
21、ta1.conditionsavoided,convectioncurrents.inuenceonthetanksmeasurementsystemandtoreducethecreationofConvertersonanddeviceunderCspeda1.1.ysensitivee1.ectronicdevices.onthetowcarts,mayhaveanreinforcedconcreteinthenearsurrounding.5.3.5.6 Randomerrorsinsta1.1.ation,seriesrunsexerimenta)1.ymeasurc11entmc1
22、hodcar1.speedtimingfixedaccuracy.anddeterminedSourcesoferror(sourcesOfUnCertainty)sha1.1.betreatedaccordingtoISO/IECGuide98-3(GUM),On1.yThefo1.1.owinginf1.uencefactorscancontributetothemeasurementuncertaintyofthedistance systematicuncertaintyofthereferencedistancemeasuringmethod; repeatabi1.ityofth
23、edistancemeasurementmethod;Thefo1.1.owinginf1.uencefactorscancontributetothemeasurementuncertaintyofthetiming systematicuncertaintyofthereferencetimingmeasuringmethod：Thewaterinthetankisnevercomp1.ete1.ysti1.1.andresidua1.currentsfromvariousoriginsarea1.ways standingwaves(surfacegravitywaves)1.inked
24、tothedimensionsOfthetankandduetopreviousmeasurementsordisturbancesinthewater;Theambienttemperaturef1.uctuationshou1.dbeas1.owaspossib1.e,anddirectsun1.ightshou1.dbetherma1.minimizetheE1.ectromagneticinterferencegeneratedbydriveunitsanddriveunitcontro1.ssuchasfrequencyinf1.uencethepowerrai1.s,testand
25、iftheseare1.ocateddirect1.yMagneticinductivef1.owmetersmaybeaffectedbyferromagneticstructures1.ikestee1.beamsorTherepeatabi1.itywithwhichthecartspeedcanbedetermineddependsontherepeatabi1.ityofthedistancebysettingandonthetoava1.ueForanyperfonningthisofmaybetoprovideseriesofestimationsofthecartspeed.7
26、1.2.2Numberofca1.ibrationpointstowingve1.ocitiestorea1.izethesystematiccharacteristicsofthecurrent-meter.Itisgenera1.1.ynecessaryAttentionsha1.1.bepaidtothefo1.1.owingpoints.itsthemechanica1.andisimmersedwater,itbebecheckedforthatoi1.,1.ubricationbythemanufacturerorusedbythecustomerinthefie1.d,isusedforthecurrent-meterswithoi1.-fi1.1.edcontactsystemsandbearingsduringtheirservicingpriortoca1.ibration.Ifdamageisobservedsoanythevisua1.errorcanbeconsiderfirst Thesuspensionofthecurrent-metersha1.1.beasspecifiedbythemanufacturer/USerofthecurent-andSha1.1.theusua1.1.ybetheisasnearthe1.owe
