EMC reference values and formulasEMC REFERENCE DATA Compiled by Henry W. Ott Revised 1998 No. 1The following lists some of the more useful EMC formulas and approximations Electric Field Coupling Vn = 2 fC R V 12 T sπApproximate Capacitances Wire in bundle 40 pF/ft Twisted wire 20 pF/ft Center-Shield RG-58 33 pF/ft Center-Metal Tray 0.2pF/ft Pin-pin Amphenol 2 pF Man-AC power line 2 pF 1/2W Res., end-end 1.5 pF Shielding = Absorption Loss A(dB) = 9 thickness skin depthRadiated Field Strength AM: P(Kw ) E(V/m)= d(Kft ) FM & TV: E (V/M)=0.6E (for AM) Power Density to Volts/Meter E (V/m)= 3.77P(W / cm 2 ) 200 V/m 100 V/m 20 V/m 10 V/m 2 V/m10mW / cm 2 3mW / cm2 100W / cm 2 30W / cm2 1W / cm2Skin Depth (inches) f AI Steel 1 MHz 0.003 0.0003 10 MHz 0.001 0.0001 100 MHz 0.0003 0.00008 1000MHz 0.0001 0.00004 Field Stre……
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