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Electrical Field Strength Conversion Table

In the far field, Zo = 120π (377) Ω

The space surrounding an electric charge or in the presence of a time-varying magnetic field has a property called an electric field. This electric field exerts a force on other electrically charged objects. The concept of an electric field was introduced by Michael Faraday.

The electric field is a vector field with SI units of Newtons per coulomb (N/C) or, equivalently, volts per meter (V/m). The SI base units of the electric field are (kg·m) / (s3·A). The strength of the field at a given point is defined as the force that would be exerted on a positive test charge of +1 coulomb placed at that point; the direction of the field is given by the direction of that force. Electric fields contain electrical energy with energy density proportional to the square of the field intensity. The electric field is to charge as gravitational acceleration is to mass and force density is to volume. - Wikipedia

Field Strength Calculation:

The field strength is calculated by adding the Antenna Factor and Cable Factor, and subtracting the Amplifier Gain from the measured reading. The basic equation is as follows:

FS = RA + AF + CF - AG

Where:

FS = Field Strength

RA = Receiver Amplitude

AF = Antenna Factor

CF = Cable Attenuation Factor

AG = Amplifier Gain

1 Gauss = 100 microTesla = 80 Amps/meter

Electrical Field Strength Magnetic Field Strength
dBμV/m μV/m dBμA/m μA/m picogauss picoTesla
  0 1.0 -51.5   0.00265   33.1 0.0033
  5   1.78 -46.5 0.0047   58.8 0.0059
10    3.162   41.5 0.0084 105.0 0.0105
15    5.623   36.5 0.0149 186.2 0.0186
20  10.000   31.5 0.0265 331.5 0.0331
        nanogauss  
25 17.8 -26.5 0.0472 0.590 0.0590
30   31.62 -21.5 0.0839 1.048 0.1048
35   56.23 -16.5 0.1492 1.865 0.1865
37   70.79 -14.5 0.1878 2.347 0.2347
40 100.00 -11.5 0.2652 3.315 0.3315
  mV/m        
50   0.316 -1.5   0.839     10.48   1.048
60   1.000   8.5   2.652     33.15   3.315
70   3.162 18.5   8.388 104.8 10.485
80 10.000 28.5 26.525 331.5 33.156
      mA/m μgauss nanoTesla
  90     31.6 38.5   0.0839     1.048   0.1048
100   100.0 48.5   0.2652     3.315   0.3315
110   316.2 58.5   0.8388 10.48 1.048
120 1000.0 68.5 2.652 33.15 3.315
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