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unable to read the frequency from this output sine wave of amplitude VS time

my programe reads through a labjack programe works up until the LJ stream graph process reads to "scaled data v's seconds" graph.where it outputs a sine wave (amplitude vs time)

for some reason the "freq. amp." analyser won't read the frequency correctly. when i run the programme it outputs a frequency of zero.
note: the amplitude is reading correctly
see both programmes attached..................
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I don't really see the utility of this VI, however, the variable "scan rate", of the "LJstream graph processing", it's an arbitrary value, why?...
What is the idea with these VIs?, tell me more, please.

Bye.
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