Campbell-scientific CR800 and CR850 Measurement and Control Systems Bedienungsanleitung PDF herunterladen (Seite 448)

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101

Section 11. Glossary

448



Volts

SIunitforelectricalpotential.

watchdogtimer

Anerror‐checkingsystemthatexaminestheprocessorstate,software

timers,andprogram‐relatedcounterswhenthedataloggerisrunningits

program.Iftheprocessorhasbombedorisneglectingstandardsystem

updatesorifthecountersareoutsidethelimits,thewatchdogtimer

resetstheprocessorandprogramexecutio

n.Voltagesurgesand

transientscancausethewatchdogtimertoresettheprocessorand

programexecution.Whenthewatchdogtimerresetstheprocessorand

programexecution,anerrorcountisincrementedinthe

WatchdogTimerentryoftheStatustable

(p.506).Alownumber(1to10)

ofwatchdogtimerresetsisofconcern,butnormallyindicatestheuser

shouldjustmonitorthesituation.Alargenumber(>10)oferrors

accumulatingoverashortperiodoftimeshouldcauseincreasingalarm

sinceitindicatesahardwareorsoftwareproblemmayexist.Whenlar

ge

numbersofwatchdog‐timerresetsoccur,consultwithaCampbell

Scientificapplicationsengineer.

weathertight

Describesaninstrumentationenclosureimpenetrablebycommon

environmentalconditions.Duringextraordinaryweatherevents,

however,sealsontheenclosuremaybebreached.

WebAPI

ApplicationProgrammingInterface(seesectionWebAPI

,formore

information).

Glossary.WildCard

acharacterorexpressionthatsubstitutesforanyothercharacteror

expression.

XML

Extensiblemarkuplanguage.

UserProgram

TheCRBasicprogramwrittenbytheCR800userinCRBasicEditoror

ShortCut.

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