#### IFT Generation

After editing the power spectrum, it is possible
to perform an IFT by:

In
the Transform menu click on Inverse Transform.

Choosing
Transform Inverse Transform (ALT,
T, I).

This generates a waveform in Y-T window 2 representing
the edited power spectrum currently plotted in the FFT plot area. This
new waveform will be scaled like the original as well as having the current
compression factor, but will appear multiplied by the data window if an
FFT was applied. From this point, the IFT waveform may be further examined
or exported (using the Extract Channels function) by using the analysis
functions provided by the WinDaq Waveform Browser from within the FFT
mode or after exiting the FFT mode by pressing CTRL+Y.

Note that when an IFT is generated, the previous
IFT (if any) is not saved and therefore cannot be pasted together to form
a large waveform made up of several sections of different IFT's. The waveform
originally occupying window 2 is deactivated, not removed from the waveform
file. Window annotation “2=0” at the bottom of the screen is automatically
enabled by the software when it displays the IFT waveform. The original
waveform may be restored by typing

2=x

where x is the channel number of the originally
displayed waveform.

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