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A.H. Systems Model PAM-0118P Pre-Amplifier
10Log
[1000] = 30
10
dBpT = dBA/m + 2.0
In this equation, the constant 2.0 is derived as follows. The magnetic flux density, B in Teslas (T), is
related to the magnetic field strength, H in A/m, by the permeability of the medium in Henrys per
meter (H/m). For free space, the permeability is given as...
= 4 x 10
H/m
-7
o
Converting from T to pT and from A/m to A/m, and deriving the Log, the constant becomes:
240 - 120 + 20Log
[4 x 10
] = 2.0
-7
10
dBpT = dBV + dBpT/V + Cable Loss
dBV/m = dBpT + 49.5 dB
 A.H. Systems inc. – May 2014
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