Kuinka laskea Decibelm W
Mikä on Decibelm W?
Converts between power ratios and decibel scale for audio, RF, and other applications. Logarithmic scale matches human perception.
Kaava
dBm = 10 × log10(P ÷ 0.001)
- P
- P value — Variable used in the calculation
Vaiheittainen opas
- 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
Ratkaistut esimerkit
Syöte
Power 1W
Tulos
30 dBm
Yleisiä virheitä vältettäväksi
- ✕Confusing dBm (power) with dBV (voltage) with dBu (relative to 0.775V)
- ✕Adding dBm values instead of multiplying power
Usein kysytyt kysymykset
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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