Read EMI EMC RF conversion formulas text version

TYPICAL CONVERSION FORMULAS

LOG -> LINEAR VOLTAGE

dBµV to Volts Volts to dBµV dBV to Volts Volts to dBV dBV to dBµV dBµV to dBV dBµA to uA µA to dBµA dBA to A A to dBA dBA to dBµA dBµA to dBA dBm to Watts Watts to dBm dBW to Watts Watts to dBW dBW to dBm dBm to dBW V = 10 V = 10

((dBµV ­ 120) / 20)

FIELD STRENGTH & POWER DENSITY

dBµV/m to V/m V/m to dBµV/m dBµV/m to dBmW/m dBµV/m to dBµA/m dBµA/m to dBµV/m dBµA/m to dBpT dBpT to dBµA/m W/m to V/m V/m to W/m2 µT to A/m A/m to µT Correction Factor Field Strength Required Power

2 2 V/m = 10 (((dBµV/m) -120) / 20)

dBµV = 20 log(V) + 120

(dBV / 20)

dBµV/m = 20 log(V/m) + 120 dBmW/m2 = dBµV/m ­ 115.8 dBµV/m = dBmW/m2 + 115.8 dBµA/m = dBµV/m ­ 51.5 dBµV/m = dBµA + 51.5 DBpT = dBµA/m + 2 dBµA/m = dBpT ­ 2 V/m = SQRT(W/m2 * 377) W/m2 = (V/m)2 / 377 A/m = µT / 1.25 µT = 1.25 * A/m

dBV = 20log(V) dBµV = dBV +120 dBV = dBµV - 120 µA = 10 (dBµA / 20) dBµA = 20 log(µA) A = 10 (dBA / 20) dBA = 20log(A) dBµA = dBA + 120 dBA = dBµA -120 W = 10

((dBm ­ 30)/10)

dBmW/m2 to dBµV/m

LOG -> LINEAR CURRENT

E-FIELD ANTENNAS

dBµV/m = dBµV + AF V/m = 30 * watts * Gain meters Watts = (V/m * meters)2 30 * Gain numeric

numeric

LOG -> LINEAR POWER

dBm = 10log(W) + 30 W = 10(dBW / 10) dBW = 10log(W) dBm = dBW + 30 dBW = dBm - 30

LOOP ANTENNAS

Correction Factors Assumed E-field for shielded loops dBµA/m = dBµV + AF dBµV/m = dBµA/m + 51.5 dBpT = dBµV + dBpT/µV

TERM CONVERSIONS

dBm to dBµV dBµV to dBm dBm to dBµA dBµA to dBm dBµA to dBµV dBµV to dBµA dBµV = dBm + 107 (50) dBµV = dBm + 10log(Z) + 90 dBm = dBµV ­ 107 (50) dBm = dBµV ­ 10log(Z) ­ 90 dBµA = dBm + 73 (50) dBµA = dBm ­ 10log(Z) + 90 dBm = dBµA ­ 73 (50) dBm = dBµA + 10log(Z) ­ 90 dBµV = dBµA + 34 (50) dBµV = dBµA + 20log(Z) dBµA = dBµV ­ 34 (50) dBµA = dBµV ­ 20log(Z)

CURRENT PROBES

Correction Factor dBµA = dBµV ­ dB(ohm)

Power needed for injection probe given voltage(V) into 50 load and Probe Insertion Loss (IL)

Watts = 10

((IL + 10log(V2/50))/10)

Information

EMI EMC RF conversion formulas

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