Cum se calculează Decibelm W
Ce este Decibelm W?
Converts between power ratios and decibel scale for audio, RF, and other applications. Logarithmic scale matches human perception.
Formulă
dBm = 10 × log10(P ÷ 0.001)
- P
- P value — Variable used in the calculation
Ghid pas cu pas
- 1dBm = 10 × log10(P ÷ 0.001)
- 2dBW = 10 × log10(P)
- 3Reverse: power (watts) = 10^(dBm ÷ 10) ÷ 1000
- 4Every 3 dB ≈ 2× power
- 5Every 10 dB ≈ 10× power
Exemple rezolvate
Intrare
Power 1W
Rezultat
30 dBm
Greșeli frecvente de evitat
- ✕Confusing dBm (power) with dBV (voltage) with dBu (relative to 0.775V)
- ✕Adding dBm values instead of multiplying power
Întrebări frecvente
Why use decibels instead of watts?
Logarithmic scale compresses large ranges (1W to 1MW becomes 30 dBm to 60 dBm), easier comparison.
What's typical dBm for audio and RF?
Audio -20 to +4 dBu typical; WiFi transmit +17 to +30 dBm; cellular -30 to +33 dBm.
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