Soft dB Opus Suite Data Logger Module - Manual (Page 38)

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9.1.5 FRF (Hx)
The FRF (Hx) module allows computing the average frequency response between channels. The
following figure presents the FRF module interface:
At any time, the computation parameters can be changed and the Recompute FRF button can be
used to update the results.
The FRF interface has two graphs: 1) The FRF graph to present the amplitude (or the phase) versus
the frequency, and 2) the coherence graph. Three types of FRF can be computed:
H1 using this equation: H1=y/x=Sxy/Sxx
H2 using this equation: H2=y/x=Syy/Sxy