Campbell-scientific CR1000 Measurement and Control System Manuel d'utilisateur télécharger pdf (Page 464)

Section 11. Glossary

464



RMS

Root‐meansquare,orquadraticmean.Ameasureofthemagnitudeof

waveorothervaryingquantitiesaroundzero.

RS‐232

RecommendedStandard232.Aloosestandarddefininghowtwo

computingdevicescancommunicatewitheachother.The

implementationofRS‐232inCampbellScientificdataloggerstoPC

communicationsisquiterigid,buttransparenttomostusers.

ImplementationofRS‐232inCampbellScientificdataloggertoRS‐232

smart‐sensorc

ommunicationsisquiteflexible.

samplerate

Therateatwhichmeasurementsaremade.Themeasurementsample

rateisprimarilyofinterestwhenconsideringtheeffectoftimeskew

(i.e.,howcloseintimeareaseriesofmeasurements).Themaximum

sampleratesaretheratesatwhichmeasurementsaremadewhen

initiatedbyasingleinstructionwithm

ultiplerepetitions.

scaninterval

ThetimeintervalbetweeninitiatingeachexecutionofagivenScan()of

aCRBasicprogram.IftheScan()Intervalisevenlydivisibleinto24hours

(86,400seconds),itissynchronizedwiththe24‐hourclock,sothatthe

programisexecutedatmidnightandeveryScan()Intervalthereafter.

Thepro

gramisexecutedforthefirsttimeatthefirstoccurrenceofthe

Scan()Intervalaftercompilation.IftheScan()Intervaldoesnotdivide

evenlyinto24hours,executionwillstartonthefirstevensecondafter

compilation.

scantime

WhentimefunctionsareruninsidetheScan()/NextScanconstruct,

timestampsarebasedonwhenthescanwasstartedaccordingtothe

CR1000clock.Resolutionofscantimeisequaltothelengthofthescan.

Seesystemtime

(p.468).

SDI‐12

SerialDataInterfaceat1200bps.Communicationprotocolfor

transferringdatabetweendatarecordersandsensors.

SDM

Synchronousdeviceformeasurement.Aprocessor‐basedperipheral

deviceorsensorthatcommunicateswiththeCR1000viahardwireover

ashortdistanceusingaproprietaryprotocol.

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