This converter transforms the power expressed in dBm into effective voltage (Vrms) for a given characteristic impedance. It is useful for electronics and RF engineers to quickly assess the voltage level of a signal from its measured power.
Formula
P(W) = 10^(dBm / 10) / 1000
Vrms = √(P(W) × R)
Explanation of the formula
The first step converts the power in dBm to watts. This is done by using 10^(dBm/10) then dividing by 1000 to get the wattage.
Then the effective voltage Vrms is calculated by multiplying this power by the characteristic impedance R and taking the square root. This method provides a direct measurement of the equivalent voltage of a signal to a resistive load.
Uses
- Evaluate the voltage of an RF signal from its power in dBm.
- Design and calibration of circuits where the voltage level is critical.
- Quick conversion of power measurements to voltage values for testing and diagnostics.
- Analysis of signals in communication and electronic instrumentation systems.