decibels above 1 femtowatt

decibels above 1 femtowatt

[′des·ə·bəlz ə¦bəv ¦wən ′fem·tō‚wät] (electricity) A power level equal to 10 times the common logarithm of the ratio of the given power in watts to 1 femtowatt (10-15 watt). Abbreviated dBf.