# Crest factor

The crest factor is an electrical characteristic value of signals which is used to establish the relationship between the peak value and the rms value of an oscillation. It is used in RF technology, power electronics and measurement technology

and is used to determine the permissible peak voltage. The crest factor, also known as the crest factor, is specified as the ratio of the peak amplitude (Vss) of a signal to its rms value (Veff). It thus depends on the signal shape and can assume values between 1 and several thousand.

For a sinusoidal signal

, the RMS value is calculated from the ratio of the peak amplitude to the square root of two, which corresponds to 0.707 times the peak amplitude. The crest factor is 1/0.707, i.e. 1.414; i.e. a sinusoidal rms voltage of 10 V has a peak voltage of 14.14 V. A triangular signal has a crest factor of 1.73.