Campbell-scientific CR1000 Measurement and Control System Manual de usuario descargar pdf (Pagina 465)

100

101

Section 11. Glossary

465

SeebeckEffect

Inducesmicro‐Voltlevelthermalelectromotiveforces(EMF)across

junctionsofdissimilarmetalsinthepresenceoftemperaturegradients.

Thisistheprinciplebehindthermocoupletemperaturemeasurement.It

alsocausessmall,correctablevoltageoffsetsinCR1000measurement

circuitry.

Semaphore(MeasurementSemaphore)

Insequentialmode,whenthemainscanexecutes,itlockstheresources

associatedwithmeasurements,i.e.,itacquiresthemeasurement

semaphore.Thisisatthescanlevel,soallsubscanswithinthescan

(whethertheymakemeasurementsornot),willlockoutmeasurements

fromslowsequences(includingthesy

stembackgroundcalibration).

Lockingmeasurementresourcesatthescanlevelgivesnon‐interrupted

measurementexecutionofthemainscan.

Send

TheSendbuttonindataloggersupportsoftware

(p.77).TheSend

commandsendsaCRBasicprogram,oranoperatingsystem,toa

CR1000.

serial

Aloosetermdenotingoutputoradevicethatoutputsanelectronic

seriesofalphanumericcharacters.

ShortCutsoftware

ACRBasicprogramgeneratorsuitableformanyCR1000applications.

KnowledgeofCRBasicisnotrequired.ShortCutisavailableatno

chargeatwww.campbellsci.com.

SI(SystèmeInternationale)

TheInternationalSystemofUnits.

signature

Anumberwhichisafunctionofthedataandthesequenceofdatain

memory.Itisderivedusinganalgorithmwhichassuresa99.998%

probabilitythatifeitherthedataorthedatasequencechanges,the

signaturechanges.

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