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Analogoutputscanbeupdatedatupto200kS/sperchannel,makingthemusefulforwaveform
generation.AnalogoutputsareusedintheNIELVISmxFunctionGenerator,Arbitrary WaveformGenerator,andBodeAnalyzerinstruments. DigitalInput/Output(DIO) ThereareeightDIOlinesonNImyDAQ.EachlineisaProgrammableFunctionInterface(PFI), meaningthatitcanbeconfiguredasageneral-purposesoftware-timeddigitalinputoroutput,or itcanactasaspecialfunctioninputoroutputforadigitalcounter.RefertoDigitalI/O(DIO) andCounters/TimerssectionformoreinformationaboutthecounteronNImyDAQ. NoteThedigitalI/Olinesare3.3VLVTTLandaretolerantto5Vinputs.The digitaloutputisnotcompatiblewith5VCMOSlogiclevels. PowerSupplies TherearethreepowersuppliesavailableforuseonNImyDAQ.+15Vand–15Vcanbeused topoweranalogcomponentssuchasoperationalamplifiersandlinearregulators.+5Vcanbe usedtopowerdigitalcomponentssuchaslogicdevices. Thetotalpoweravailableforthepowersupplies,analogoutputs,anddigitaloutputsislimited to500mW(typical)/100mW(minimum).Tocalculatethetotalpowerconsumptionofthe powersupplies,multiplytheoutputvoltagebytheloadcurrentforeachvoltagerailandsum themtogether.Fordigitaloutputpowerconsumption,multiply3.3Vbytheloadcurrent.For analogoutputpowerconsumption,multiply15Vbytheloadcurrent.Usingaudiooutput subtracts100mWfromthetotalpowerbudget. Forexample,ifyouuse50mAon+5V,2mAon+15V,1mAon–15V,usefourDIOlinesto driveLEDsat3mAeach,andhavea1mAloadoneachAOchannel,thetotaloutputpower consumptionis: 5V50mA=250mW |+15V|2mA=30mW |–15V|1mA=15mW 3.3V3mA4=39.6mW 15V1mA2=30mW Totaloutputpowerconsumption=250mW+30mW+15mW+39.6mW+ 30mW=364.6mW DigitalMultimeter(DMM) TheNImyDAQDMMprovidesthefunctionsformeasuringvoltage(DCandAC),current(DC andAC),resistance,anddiodevoltagedrop. DMMmeasurementsaresoftware-timed,soupdateratesareaffectedbytheloadonthe computerandUSBactivity. |
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