The dBm to dBµV Conversion Calculator converts a power level expressed in dBm (decibel-milliwatts) to an equivalent voltage level in dBµV (decibel-microvolts). This conversion is commonly used in RF, cable TV, and EMC measurements to relate signal power to voltage across a defined impedance.
Formula
dBµV = dBm + 90 + 20 × log10(√Z0)
Formula Explanation
- dBm = Power level in decibel-milliwatts.
- Z0 = Characteristic impedance of the system, typically 50 Ω or 75 Ω.
- The term 90 adjusts for the conversion from milliwatts to microvolts, and the 20 × log10(√Z0) factor accounts for the voltage-to-power relationship at a given impedance.
Uses of this calculator
- Converting measured power levels (dBm) to voltage levels (dBµV) for compliance testing.
- Analyzing RF signals in communication and broadcast systems.
- Evaluating performance of cable TV and EMC systems.
- Cross-referencing dBm readings to dBµV for instrumentation and calibration.
What is 0 dBm in dBµV for a 50-ohm system?
Input: dBm = 0, Z0 = 50 Ω
Output:
- dBµV = 0 + 90 + 20 × log10(√50)
- dBµV = 90 + 20 × log10(7.071)
- dBµV = 90 + 20 × 0.849 = 90 + 16.98 = 106.98 dBµV
- 0 dBm equals approximately 107 dBµV in a 50 Ω system.