Campbell-scientific CR3000 Micrologger Uživatelský manuál stáhnout pdf (Strana 455)

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101

Section 11. Glossary

455

DTE

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

thelimitedcontextofpracticalusewiththeCR3000,itdenotesthepin

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

ontheCR3000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CR3000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CR3000

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

ESD

Electrostaticdischarge

ESS

EnvironmentalSensorStation

excitation

Applicationofaprecisevoltage,usuallytoaresistivebridgecircuit.

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