volts/meter

Hi, I need, and I don't know if it's possible, to convert an indication in dbm are supplied with a field meter volts/meter for elettrosmog control tv, can anyone help me? Thank you

Hello!!

dBm and adimensionnel unit used in measures of power--> 1dbm = 10 log [power (mW) / 1 (mW)]

While

Volts/m is a dimensional unit used in the measurements of the electric field.

In order to connect, you need to know the impedance characteristic of the medium of propagation and expansion of the surface.

Pretend to work in a vacuum at a typical distance r = 1 m from the source, you get:

ZC = 377 ohms

S = 4/3 pi r ^ 2 = 1, 04 m ^ 3

so, you can calculate the absolute power:

P (Watt) = 1/1000 * 10 ^ [dBm/10]

and the standard power density:

P/m ^ 2 = P (watts) / s = P (watts) / 1.04

which is equal to:

P/m ^ 2 = V/m A / m

You know that:

A / m = V/m 1/Zc

so:

P/m ^ 2 = (V/m) ^ 2 * 1/Zc

and you have:

Volt/meter = [(P/m ^ 2) (* Zc)] ^ (1/2)

Have a great day!

Tags: NI Software

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