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This parameter is used in the thermal plate scan method of balancing the beam.
A higher speed may be used to get the PLL to lock thereby sacrificing some
signal to noise (ie. a lower drum speed is preferred). As a last resort if PLL
lock is not obtained at slow drum speeds then the system nvs parameter scanntu
can be set to try it with different ntu values. If this parameter is zero then
the scanning routines automatically pick an ntu value derived from the regular
ntu value and scaled for the scanning drum speed.
It is expected that this will almost always work and hence there will be no need
to adjust the `scanntu' value but it is there just in case.
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