Campbell-scientific CR1000 Measurement and Control System Manual de usuario descargar pdf (Pagina 453)

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101

Section 11. Glossary

453

dimension

Tocodeforavariablearray.DIMexample(3)createsthethreevariables

example(1),example(2),andexample(3).DIMexample(3,3)createsnine

variables.DIMexample(3,3,3)creates27variables.

DNS

Domainnamesystem.ATCP/IPapplicationprotocol.

DTE

Dataterminalequipment.Whilethetermhasmuchwidermeaning,in

thelimitedcontextofpracticalusewiththeCR1000,itdenotesthepin

configuration,gender,andfunctionofanRS‐232port.TheRS‐232port

ontheCR1000andonmanythird‐partytelecommunicationsdevices,

suchasadigit

alcellularmodems,areDCE.Attachmentofanull‐modem

cabletoaDCEdeviceeffectivelyconvertsittoaDTEdevice.

Duplex

Canbehalforfull.Full‐duplexissimultaneous,bidirectionaldata.

Duplex

Thepercentageofavailabletimeafeatureisinanactivestate.For

example,iftheCR1000isprogrammedwith1secondscaninterval,but

theprogramcompletesafteronly100millisecond,theprogramcanbe

saidtohavea10%dutycycle.

EarthGround

Agroundingrodorothersuitabledevicethatelectricallytiesasystem

ordevicetotheearth.Earthgroundisasinkforelectricaltransientsand

possiblydamagingpotentials,suchasthoseproducedbyanearby

lightningstrike.Earthgroundisthepreferredreferencepotentialfor

analogvoltagemeasurements.Noteth

atmostobjectshavea"an

electricalpotential"andthepotentialatdifferentplacesontheearth‐

evenafewmetersaway‐maybedifferent.

engineeringunits

Unitsthatexplicitlydescribephenomena,asopposedtotheCR1000

measurementunitsofmilliVoltsorcounts.

ESD

Electrostaticdischarge

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