Soft dB Opus Suite Data Logger Module - Manual (Page 40)

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These controls allow selecting the reference channel (x) and the second
channel (y).
or
These controls allow the integration of the inputs in the FRF calculation
process.
This control can be used to select the format of the Y-axis for the FRF graph. The amplitude, phase
(deg./rad), Im and Re formats can be used.
The function Export .txt allows exporting the FRF (the Phase (Deg./Rad), Amplitude, Im and Re) and
the coherence data in a text format.
9.1.6 ISO2631
This function applies a filter and computes the statistics on three selectable channels following the
ISO2631 standard. The next figure presents the interface of the ISO2631 module: