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This project shows how to use a SPUR vector in FMULT_B2. The element help for this block is quite extensive and a good place to begin to understand how this block works. The example system diagrams are just illustrative examples and are self explanitory.
In each case the zero term in the SPUR vector indicates the xN of the signal of interest. The values in the vector preceeding and following the zero value apply to the other harmonics of the signal.