A.H. Systems PAM-0118 Bedieningshandleiding - Pagina 11

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A.H. Systems Model PAM-0118 Pre-Amplifier

10Log

[1000] = 30

dBpT = dBµA/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...

= 4π x 10

H/m

-7

Converting from T to pT and from A/m to µA/m, and deriving the Log, the constant becomes:

240 - 120 + 20Log

[4π x 10

] = 2.0

-7

dBpT = dBµV + dBpT/µV + Cable Loss

dBµV/m = dBpT + 49.5 dB

REV B