Watts (W) go decibel-milliwatts (dBm) , áireamhán tiontaithe cumhachta .
Iontráil an chumhacht i vata agus brúigh an cnaipe Tiontaigh :
áireamhán tiontaithe dBm go vata ►
Tá an chumhacht P (dBm) i dBm cothrom le 10 n-uaire an logarithm bonn 10 1000 uair an chumhacht P (W) i vata (W) arna roinnt ar 1 bhata (W):
P (dBm) = 10 ⋅ log 10 (1000 ⋅ P (W) / 1W) = 10 ⋅ log 10 ( P (W) / 1W) + 30
mar sin
1W = 30dBm
Tiontaigh 20 vata go dBm:
P (dBm) = 10 ⋅ log 10 (1000⋅20W) = 43.0103dBm
| Cumhacht (mW) | Cumhacht (dBm) |
|---|---|
| 0 W. | gan sainmhíniú |
| 0 + W. | -∞ dBm |
| 01 W. | -20 dBm |
| 0.0001 W. | -10 dBm |
| 0.001 W. | 0 dBm |
| 0.01 W. | 10 dBm |
| 0.1 W. | 20 dBm |
| 1 W. | 30 dBm |
| 10 W. | 40 dBm |
| 100 W. | 50 dBm |
| 1000 W. | 60 dBm |
| 10000 W. | 70 dBm |
| 100000 W. | 80 dBm |
| 1000000 W. | 90 dBm |
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