It seems that the setting of the values of „Pre-sends“ has no influence.
The excitation runs nonstop when you start the machine regardless whether you enter 0 or 99. In some cases it makes sense to take single shots only.
In my opinion it would make more sense either to store automatically the latest measurement after the given pre-send # is achieved OR the function stops when the # is achieved. Then you can decide to store it or start a new measurement.