Campbell-scientific CR1000 Measurement and Control System Manual do Utilizador descarregar pdf (Página 471)

100

101

Section 11. Glossary

471

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.528).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CR1000userinCRBasicEditoror

ShortCut.

11.2 Concepts

11.2.1 Accuracy, Precision, and Resolution

Three terms often confused are accuracy, precision, and resolution. Accuracy is a

measure of the correctness of a single measurement, or the group of

measurements in the aggregate. Precision is a measure of the repeatability of a

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