Data Sheet

USBProtocolSuiteUserManual 501
PowerTracker:VBusandConfigurationChannel(CC) TeledyneLeCroyCorporation
Power Tracker Options
IfyouselectPowerTrackerfromtheReportmenu,youcanselectHide,Full Screen,Sync
byTime,orRealTimeMonitor(see“PowerTrackerToolbar”onpage 501).
Theleftsideshowspower,voltage,andcurrentlevels.Right‐clickingacolumnallowsyou
toselectthevertical‐scaleorigin.Theoriginis0orneartheminimummeasurement
value.
Thehorizontalaxisshowstimeinmilliseconds.Youcannavigatewiththeslider.Theslider
setstheleftverticalline.Thedistancetotherightdashedverticallinerepresentsthe
samplinginterval.
Youcanusetimemarkerstomeasuretimesinthisview.Todeletemarkers,right‐clickthe
markerandselectDeleteMarker(s).
Youcanshow/hideminimumandmaximumvaluesforPower,Voltage,andCurrentby
right‐clickingandchoosingShowMin/MaxValuesfromthepopupmenu.
Note:TheMinorMaxvaluespresentedherearenotexactlythesameasthoseshownintheCATCor
Spreadsheetviews.Thisisbecausethisviewpresentsthevaluesastheyexistwhensampledat
20microsecondintervals.ThevaluesshowninthePackettypeviewsarelinearlyinterpolated
fromthesesamplestoshowtheapproximatevalueatthetimethepacketistimestamped.
YoucangotothetimeatwhichMinimumorMaximumvaluesofPower,Voltage,or
Currentoccurbyright‐clickingandchoosingGoTofromthepopupmenuandthen
choosingasubmenuitem.
ThePowerTrackersamplesareacquiredfromthestartoftherecordingtothefinish.
Sincepackettrafficorother"BusCondition"eventscanstartlongaftertherecording
startsorfinishlongbeforetherecordingends,manypowersamplesintheseendranges
can"map"tothefirstpacketorlastpacketinatrace.Forallevents,whensynchronizing
betweenthePowerTrackerviewandotherviews,theitemsassociatedintheotherviews
aretheonesclosestintimetothetimestampofthePowerTrackersample.
Note:PowermeasurementaccuracyforCurrentis+/‐10mA.
PowermeasurementaccuracyforVoltageis+/‐50mV.
PowermeasurementaccuracyforPoweris+/‐50mW.
Thesamplingperiodofthecurrentandvoltageisonceevery20microseconds,or50 KHz.
Power Tracker Toolbar
Figure 10.45: Power Tracker Toolbar