Filter warning and ascii save error

Question

Hello,
      I am performing modal
analysis using a impact hammer, USB NI 9233 cRIO DAQ and Sound and
Vibration assistant. The steps have been set in Signal express as DAQ
Acquire =>Trigger=>Filter=> Power spectrum => FRF =>
Save to Ascii.
    I am facing two problems which I cant
understand. Inspite of selecting data for saving as an ascii file it
keeps giving me an error saying data file needs to be selcted. I
selected the filtered data, FRF, coherence in separate save as ascii
steps. Also the filter issues me a warning that the triggered data is
not contiguous. What does this mean? I have selected the option of
continuous samples in the DAQ Acquire tab. Do I need to change
something else? I tried using both IIR and FIR filters and it still
displays the error that Signal is not contiguous.
Thankyou.
Solved!
Go to Solution.

Answer 1

Hello StuMtu,
Thanks for your post!
For the save to ASCII file problem I would say to make sure that you have a path specified in the File Settings Tab of the Save to ASCII/LVM file step. See the picture attached below. Also the warning you are getting about "contiguous" data means that the information that you are sending to the Filter step is not of a continuous Time Stamp Data. I am assuming here that you are only sending the trigger data from the 9233 to the Filter step. So for instance if your event happens 1 second apart then the data going to the filter is not continuous/contiguous. The data going to the filter is continuous but the time stamps do not fall right after the other. This is OK and its still going to filter your data but its just letting you know that your data is not continuous since each block of filtered data does not have a consistent time stamp. Let us know if this clears up your problems or concerns and have a great day!
Cheers!
Corby_B
Attachments:
SVA save to file.jpg ‏147 KB