ETS-Lindgren 3160 Pyramidal Standard Gain Antenna - Manual (Page 46)

46 Radiated Emissions Measurements www.ets-lindgren.com
E QUATION 6
A/m = 10
dB ( A/m)-120 
20
E QUATION 7
dB(W/m 2 ) = 10 log (V/m

A/m)
E QUATION 8
dB(mW/m 2 ) = dB(W/m 2 ) + 30.0
E QUATION 9
dB(pT) = dB(  A/m) + 2.0
The magnetic flux density B in (T) is related to the magnetic field
strength H in (A/m) by the permeability of the medium in (H/m). For
free space, the permeability is µ
o
= 4 π .10
-7
H/m. Converting from (T)
to (pT) and from (A/m) to ( µ A/m) and taking the log, the constant
becomes:
20 120 51 5
10
log ( ) .  
240 120 20 4 10 2 0
10
7      log ( ) . 