<Dl> <Dd> f r m s = lim T → ∞ 1 T ∫ 0 T (f (t)) 2 d t . (\ displaystyle f_ (\ mathrm (rms)) = \ lim _ (T \ rightarrow \ infty) (\ sqrt ((1 \ over (T)) (\ int _ (0) ^ (T) ((f (t))) ^ (2) \, dt))).) </Dd> </Dl> <Dd> f r m s = lim T → ∞ 1 T ∫ 0 T (f (t)) 2 d t . (\ displaystyle f_ (\ mathrm (rms)) = \ lim _ (T \ rightarrow \ infty) (\ sqrt ((1 \ over (T)) (\ int _ (0) ^ (T) ((f (t))) ^ (2) \, dt))).) </Dd> <P> The RMS over all time of a periodic function is equal to the RMS of one period of the function . The RMS value of a continuous function or signal can be approximated by taking the RMS of a sequence of equally spaced samples . Additionally, the RMS value of various waveforms can also be determined without calculus, as shown by Cartwright . </P> <P> In the case of the RMS statistic of a random process, the expected value is used instead of the mean . </P>

How to calculate rms value of a signal