I don't think anything special is needed to use the OPT button in the calculator. It prompts you to select an instance, and then you choose the operating point parameter from the pulldown list. This uses the finalTimeOP-info data from the psf directory. This generates the expression in the calculator, which you can then use as normal.

As for the manual, you can find this in your installation, either using cdsdoc or by looking at <instdir>/doc/anawavefm/anawavefm.pdf . If using a recent version, there's also the wavescan/wavescan.pdf document.

Regards,

Andrew.