User's Manual

N72GNSSReferenceReceiverUserGuidePage15
3. BATTERIESANDPOWE R 
TheN72GNSSreferencereceiverusesaninternalrechargeableLithium‐ion
battery,whichcanbereplacedonlyatanAuthorizedCHCServiceCenter.
Thereceivercanalsobepoweredbyanexternalpowersourcethatis
connectedtoeitheroftheLemoports.
Theoperationaltimeprovidedbytheinternalbattery
dependsonthetype
ofmeasurementandoperatingconditions.Typically,theinternalbattery
providesupto17hoursoperation.
NOTE–Allbatteryopera tionaltestsarecarriedoutwithnew,
fully‐chargedbatteriesatroomtemperature,trackingbothGPSand
GLONASSsatelliteswhilestoringandstreamingdataat1Hz.Older
batteries,attemperaturessignificantlyhigherorlowerthanroom
temperature,willhaveareducedperformance.Powerconsumption
increaseswithanincreasingnumberofactivelytrackedsatellitesand
withincreasingobservation
andstoragerates.
3.1. EXTERNALPOWER 
Thereceiverusesanexternalpowersourceinpreferencetoitsinternal
battery.Ifthereceiverisnotconnectedtoanexternalpowersource,orif
theexternalpowersupplyfails,theinternalbatteryisused.
Thereceiver’sinternalbatterychargesonlywhentheexternalvoltageis
above11VDC.
CHCrecommendsthattheappliedexternalpoweroffers
between12VDCand36VDCandisabletosupplyatleast4Wofpowerfor
thelong‐terminstallationsandensuringthattheinternalbatteryischarged
andreadytocompensateforpowersupplydisruptions.
Whilecarrying
outstaticmeasurementsforpost‐processedcomputations
usingtheinternalmemory,ifnoexternalpowerissuppliedandtheinternal
batteryisdrained,thereceivershutsdown.Nodataislost;however,when
powerisrestored,thereceivershouldbeconfiguredagain.
WARNING–TheexternalACpoweradapterandits
associatedpowercord
andplugarenotintendedtobeinstalledoutdoors,norinawetlocation.Do
notpowerthereceiverthroughexternalpowerwhenoperatinginawet
environmentoranenvironmentthatmaybecomewet.Thepowerinput
connectionsmustbesheltered.
WARNING–Whenyouapply
DCvoltagetothisproductthroughtheLemo
connector,theDCvoltagemustbelimitedto36VDC+0%underboth