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# formulas2 - EMC Related Formulae LogLinear Voltage dBV to...

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Robert Richards Page 1 03/30/03 EMC Related Formulae Log Linear Voltage dB μ V to Volts ( 29 ( 29 20 / 120 10 - = V dB V m Volts to dB μ V ( 29 120 log 20 + = V V dB m dBV to Volts ( 29 20 / 10 dBV V = Volts to dBV ( 29 V dBV log 20 = dBV to dB μ V 120 + = dBV V dB m dB μ V to dBV 120 - = V dB dBV m Log Linear Power dBm to Watts ( 29 ( 29 10 / 30 10 - = dBm W Watts to dBm 30 ) log( 10 + = W dBm dBW to Watts ( 29 10 / 10 dBW W = Watts to dBW ) log( 10 W dBw = dBW to dBm 30 + = dBW dBm dBm to dBW 30 - = dBm dBW Log Linear Current dBuA to uA ( 29 20 / 10 A dB A m m = uA to dBuA ) log( 20 A A dB m m = dBA to A ( 29 20 / 10 dBA A = A to dBA ) log( 20 A dBA = dBuA to dBA 120 - = A dB dBA m dBA to dBuA 120 + = dBA A dB m Log Linear Impedance dB(ohms) to ohms ( 29 20 / ) ( 10 ohms dB Z = ohms to dB(ohms) ( 29 Z ohms dB log 20 ) ( = Term Conversion dBm to dBuV dBm Z v dB + + = ) log( 10 90 m dBuV to dBm ) log( 10 90 Z V dB dBm - - = m dBuA to dBm 90 ) log( 10 - + = Z A dB dBm m dBm to dBuA 90 ) log( 10 + - = Z dBm A dB m dBuA to dBuV ) log( 20 Z A dB V dB + = m m dBuV to dBuA ) log( 20 Z V dB A dB - = m m Volts to Amps & Watts Z V A = Z V W 2 = Amps to Volts & Watts Z A V * = Z A W * 2 = Watts to Volts & Amps Z W V * = Z W A = RF related, Field Strength & Power Density dBuV/m to V/m ) 20 / ) 120 ) / ((( 10 / - = m V dB m V m V/m to dBuV/m ( 29 120 / log 20 / + = m V m V dB m

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