V/m -to- dBpT

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Equation / Last modified by MichaelBartmess on 2015/02/05 15:39
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DavidC.V/m -to- dBpT
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RF Unit Conversion:  V/m - dBpT ] This equation converts the Input quantity of V/m (volts per meter) units to the corresponding  dBpT (Decibel picotesla) units.  To convert from dBμV/m to dBpT it is necessary to subtract 49.5 dB

V/m is an SI derived unit whose quantity is electric field strength. 

Tesla is an SI derived unit whose quantity is magnetic field strength.

The units for V/m can be expressed in terms of SI base units as:   `(m * kg) / (s^3 * A)`   

and the units for Tesla are usually:  `(kg)/(s^2 A)`

Notes

The following is copied from --  Formulas for Unit Conversion Charts - Bob Dahse @ http://www.GeoPathfinder.com/9801 rev.11/04/2012

I have found the following formulas convenient when reading research papers or published tables showing the results of electromagnetic field studies done in different countries, or with different instruments. The conversion charts I have also published (at http://www.geopathfinder.com/Conversion Chart.pdf are set up with Decibel- milliwatts (dBm) as the anchor point, shown in whole units for convenience. The next two columns relate to electric fields (kV/m & V/m). After that, the next six columns are power levels. And the final four columns are concerned with magnetic fields. The calculations in the charts all revolve around Watts per square meter (W/m2).

So to find the other values if you know W/m2, here are the formulas I used to get them:

V/m = √ W/m2 x 377                         (Volts per meter = the square root of the product of Watts per square meter times 377)
 kV/m = V/m /1,000                            (Kilo-volts per meter = Volts per meter divided by 1,000)
 mW/cm2 = W/m2 / 10                       (Milli-Watts per square centimeter = Watts per square meter divided by 10)
 uW/m2 = W/m2 x 1,000,000       (Micro-Watts per square meter = Watts per square meter times one million)
 uW/cm2 = W/m2 / .01                  (Micro-Watts per square centimeter = Watts per square meter divided by .01)
 nW/cm2 = W/m2 / .000,01             (Nano-Watts per square centimeter = Watts per square meter divided by .000,01
 pW/cm2 = W/m2 / .000,000,01    (Pico-Watts per square centimeter = Watts per square meter divided by .000,000,01)
 A/m = √ W/m2 / 377                      (Amps per meter = the square root of the product of Watts per square meter divided by 377)
 mG = W/m2 / 23.9                        (Milli-Gauss = Watts per square meter divided by 23.9)
 uT = W/m2 / 239                          (Micro-Teslas = Watts per square meter divided by 239)
 nT = W/m2 / 239,000                 (Nano-Teslas = Watts per square meter divided by 239,000)

Some other useful conversion formulas are :

mG = (A/m)2 x 15.774059
 A/m = √ mG / 15.774059
 nT = mG x 100
 mG = nT / 100
 A/m = √ nT / 1,577.4059
 nT = (A/m)2 x 1,577.4059
 V/m = W/m2 / A/m
 V/m = (mW/cm2 x 10) / A/m
 A/m = W/m2 / V/m
 A/m = (mW/cm2 x 10) / V/m

And some useful predictive (but possibly inaccurate*) conversions between electric, magnetic, and power units:

V/m = √ nT x 90,103
 V/m = √ mG x 9,010.3
 nT = (V/m)2 / 90,103
 mG = (V/m)2 / 9,010.3
 W/m2 = (V/m)2 / 377
 mW/cm2 = (V/m)2 / 3,770
 W/m2 = (A/m)2 x 377
 mW/cm2 = (A/m)2 x 37.7

*Since power flow, electric fields, and magnetic fields are all perpendicular to each other, like the hub, spokes, and rim of a bicycle wheel respectively,
 these results may not perfectly correlate with measured field readings, depending on the geometry of wiring configurations and measuring distances.
 Also, in the conversion tables, you will find some numbers abbreviated with an exponential notation. For instance, 2.41E-07 is really 2.41 times 10 to the negative seventh power, or 0.000000241. And 7.63E+08 is really 7.63 times ten to the eighth power, or 763,000,000.0. Count the digits before/after the decimal points and you will get the idea!