Dear All,
If anybody can check the attached vi and answer some questions I would be more than appreciated.
This vi works perfectly when I use sine wave.vi instead of using the data array.
I cannot figure out why the frequency of the raw data (calculated through 'tone measurements.vi')
does not match the frequency observed on FFT graphs for both the raw data and the filtered data.
Also what is going on with filtering limits is not clear to me.
If current settings are used data is not filtered and the frequency seems to be around 0.114
which does not match the FFT plot either. Also filtered data is completely different than the
original data. If the filtering limits are modified so does the frequency
observed.
Low cut-off:0.0001
High cut-off:500
Calculated Frequency:0.114 hz
FFT: 99 hz
Low cut-off:1
High cut-off:200
Calculated Frequency:94 hz
FFT: 99 hz
Low cut-off:10
High cut-off:200
Calculated Frequency:99 hz
FFT: 99 hz
Thank you.
ilter