What is dBm? A logarithmic ratio with a reference power of P0 = 1.000 milliwatt = 0 dBm.
dBm is defined as power ratio in decibel (dB) referenced to one milliwatt (mW) and the "m" in dBm stands for milliwatt. With the known impedance value you
can convert voltage V to level dBm (power) and vice versa.
Reference voltage at 600 ohms- 1 mW according to 0 dBm
Reference voltage at 50 Ohm - 1 mW according to 0 dBm
Enter two values, the third value will be calculated.
Voltage V, level L, and impedance Z