EMC单位转换

EMCFormulaSLog↔↔LinearVoltagedBμVtoVolts()()20/12010-=VdBVmVoltstodBμV()120log20+=VVdBmdBVtoVolts()20/10dBVV=VoltstodBV()VdBVlog20=dBVtodBμV120+=dBVVdBmdBμVtodBV120-=VdBdBVmLog↔↔LinearPowerdBmtoWatts()()10/3010-=dBmWWattstodBm30)log(10+=WdBmdBWtoWatts()10/10dBWW=WattstodBW)log(10WdBw=dBWtodBm30+=dBWdBmdBmtodBW30-=dBmdBWLog↔↔LinearCurrentdBuAtouA()20/10AdBAmm=uAtodBuA)log(20AAdBmm=dBAtoA()20/10dBAA=AtodBA)log(20AdBA=dBuAtodBA120-=AdBdBAmdBAtodBuA120+=dBAAdBmLog↔↔LinearImpedancedB(ohms)toohms()20/)(10ohmsdBZ=ohmstodB(ohms)()ZohmsdBlog20)(=TermConversiondBmtodBuVdBmZvdB++=)log(1090mdBuVtodBm)log(1090ZVdBdBm--=mdBuAtodBm90)log(10-+=ZAdBdBmmdBmtodBuA90)log(10+-=ZdBmAdBmdBuAtodBuV)log(20ZAdBVdB+=mmdBuVtodBuA)log(20ZVdBAdB-=mmVoltstoAmps&WattsZVA=ZVW2=AmpstoVolts&WattsZAV*=ZAW*2=WattstoVolts&AmpsZWV*=ZWA=RFrelated,FieldStrength&PowerDensitydBuV/mtoV/m)20/)120)/(((10/-=mVdBmVmV/mtodBuV/m()120/log20/+=mVmVdBmdBuv/mtodBmW/m28.115/2/-=mVdBmdBmmdBmW/m2todBuV/m8.1152//+=mdBmmVdBmdBuV/mtodBuA/m5.51//-=mVdBmAdBmmdBuA/mtodBuV/m5.51//+=mAdBmVdBmmdBuA/mtodBpT2/+=mAdBdBpTmdBpTtodBuA/m2/-=dBpTmAdBmW/m2toV/m377*)2/(/mWmV=V/mtoW/m23772)/(2/mVmW=woundcoilFluxDensity),(20))((4mradiusampsturnsTpm=uTtoA/m25.1/TmAm=A/mtouT)/(*25.1mAT=mEMCCalcChristianRosu(FarField)Gain,dBitonumeric)10/(10dBinumericGain=Gain,numerictodBi)log(10numericGaindBi=Gain,dBitoAntennaFactor79.29)log(20--=dBiMHzAFAntennaFactortogainindBi79.29)log(20--=AFMHzdBiFieldStrengthgivenWatts,NumericGain,DistanceinmetersMetersGainwattsmVnumeric**30/=FieldStrengthgivenWatts,dBigain,DistanceinmetersMeterswattsmVdBi)10/(10**30/=TransmitPowerneeded,givendesiredV/m,Antennanumericgain,Distanceinmeters.numericGainmetersmVwatts*30)*/(2=TransmitPowerneeded,givenV/m,AntennadBigain,Distanceinmeters)10/(210*30)*/(dBimetersmVwatts=AmplitudeModulationPeakpower,givenCWpowerandmodulation%.(sinewaveAM)2))01.0*%(1(ModWWCWpeak+=Averagepower,givenCWpowerlevelandmodulation%(sinewaveAM)2))01.0*%(2(*2ModWWcwavg+=Averagepower,givenpeakpowerandmodulation%22))01.0*%(1(*2))01.0*%(2(*ModModWWpeakavg++=CurrentProbedB(ohm)toZt(transferimpedance))20/)((10ohmdBtZ=ZttodB(ohm))log(20)(tZohmdB=Conductance(Gt)indB(s)totransferimpedance,(Zt)indB(ohms)tGtZ-=TransferImpedanceinZt(dB(ohms)),toConductanceinGt(dB(s))tZtG-=PowerneededforBCIProbe(50Ω),givenvoltagelevelinto50Ωload(V)andProbeInsertionLossLI.)10/))50/2log(10((10VLIwatts+=Wattsneededfor150OhmEMClamp)10/))150/2log(10((10VLIwatts+=ConductedcurrentlevelusingcurrentmeasuringprobegivenprobefactorindB(ohm)andprobeterminalvoltageindBuv)(ohmdBVdBAdB-=mmConductedcurrentlevel,givenprobefactorinZt(ohms)andterminalvoltageindBuv)log(20tZVdBAdB-=mmdBcalculationsComputedbdelta(volts)⎟⎟⎠⎞⎜⎜⎝⎛=21log20VVdBComputedBdelta(amps)⎟⎟⎠⎞⎜⎜⎝⎛=21log20AAdBComputedBdelta(watts)⎟⎟⎠⎞⎜⎜⎝⎛=21log10WWdBcomputenewvoltagew/dbdelta⎟⎟⎟⎠⎞⎜⎜⎜⎝⎛+Δ=20)log(20(10givenVdBnewVcomputenewwattagew/dbdelta⎟⎟⎟⎠⎞⎜⎜⎜⎝⎛+Δ=10)log(10(10givenWdBnewWEMCCalcChristianRosu=11VSWRgivenreflectioncoefficientrr-+=11VSWRReflectioncoefficient,ρ,givenZ1/Z2ohms2121ZZZZ+-=rReflectioncoefficient,ρ,givenfwd/revpowerfwdrevPP=rReturnLoss,givenfwd/revpower⎟⎟⎠⎞⎜⎜⎝⎛=revfwdPPdBRLlog10)(ReturnLoss,givenVSWR⎟⎠⎞⎜⎝⎛+--=11log20)(VSWRVSWRdBRLReturnLoss,givenreflectioncoefficient)log(20)(r-=dBRLMismatchloss,givenfwd/revpower⎟⎟⎠⎞⎜⎜⎝⎛=-revfwdfwdPPPdBMLlog10)(Mismatchloss,givenreflectioncoefficient)1log(10)(2r--=dBMLMiscLinearinterpolationwithlogoffreqLLULULXXXXFFLogFFLogValue+-=)(*)/()/(whereFL=lowerfrequencyFU=UpperfrequencyXL=ValueatlowerfrequencyXU=ValueatupperfrequencyFX=FrequencyofdesiredvalueTEMCellPowerNeededZHeightVWatts2)5.0**(=whereV=fieldstrengthinV/mZ=TEMcellimpedanceinohmsEMCCalcChristianRosu