harmonic analysis.vi in lv8.0

[knifeman]

In LV8.0's example,there is a dome use the harmonic analysis.vi to analysis the harmonic distortion condition of a mix signal which components contains fundation frequency and 2rd,3rd harmonic.
But I use the signal source to generate a 50Hz sine signal to input and use the same harmonic analysis.vi to get the harmonic information,and the error born! The frequency's range is form 0 to 0.6,and I do not know why. :headbang:

Help and thank u very much!