Peak Hold Averaging

A peak hold averaging measurement is performed at each individual frequency line and retains the RMS peak levels of the averaged quantities from one FFT record to the next record.

Peak-hold averaging is most useful when configuring a measurement system or when applying limit or upper limit testing to a frequency spectrum.

Peak-hold averaged measurements are computed according to the following equations:

FFT spectrum

M A X X * ⋅ X

power spectrum

M A X ( X * ⋅ X )

where

X is the complex FFT of the stimulus signal x.

X* is the complex conjugate of X.
Note Dual-channel, stimulus-response measurements do not support peak-hold averaging.