User Manual

Section 11. Glossary
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UserProgram
TheCRBasicprogramwrittenbytheCR3000userintheCRBasicEditor
ortheShortCutprogramgenerator.
USR:
AportionofCR3000memorydedicatedtothestorageofimageorother
files.
URI
uniformresourceidentifier
URL
uniformresourcelocater
variable
ApacketofCR3000memorygivenanalphanumericname,whichholds
apotentiallychangingnumberorstring.
Vac
Voltsalternatingcurrent.AlsoVAC.Mainsorgridpowerishigh‐level
Vac,usually110Vacor220Vacatafixedfrequencyof50Hzor60Hz.
High‐levelVacisusedasaprimarypowersourceforCampbellScientific
powersupplies.Donotconnecthigh‐levelVacdirectl
ytotheCR3000.
TheCR3000measuresvaryingfrequenciesoflow‐levelVacintherange
of±20Vac.
Vdc
Voltsdirectcurrent.AlsoVDC.TheCR3000operateswithanominal12‐
Vdcpowersupply.Itcansupplynominal12Vdc,regulated5Vdc,and
variableexcitationinthe±2.5Vdcrange.Itmeasuresanalogvoltagein
the±5.0‐Vdcrangeandpulsevoltageinthe±20‐Vdcrange.
Voltmeter
Aninexpensiveandreadilyavailabledeviceusefulintroubleshooting
dataacquisitionsystemfaults.
Volts
SIunitforelectricalpotential.