DIAdem

[Ahfa]

Hi All,

Starting to use Diadem. I have got time domain vibration data and I am trying to do partial waveform analysis on that.  I want to analyse data by scrolling through time-domain and looking at the Corresponding FFT for that section. However  unable to to do. Its just calculating FFT for whole window and I dont know how to scroll through time domain and and FFT simulataneously. I have done this with other software before.

Any help would be great.

Ahfa

[Danceman]

Hello Ahfa,

      I believe the best tool to do this is the Joint Time-Frequency 2-D plots. The option in the forum and wikipedia site below will explain how to create a Joint Time-Frequency plot and how one is created.  I hope that answers your question and let me know if I can be of further assistance.
      http://208.74.204.114/t5/DIAdem/joint-time-frequency-analysis-tool-help/td-p/1403012/page/2

      http://en.wikipedia.org/wiki/Short-time_Fourier_transform

      As I side note I created a Joint-Time frequency plot recently. this code seems to do exactly what you want,  but it would be hard for someone else to jump in and modify the code.

Daniel  

[Brad_Turpin]

Hi Ahfa,

In addition to the suggested Joint Time Frequency tool suggested above, you might appreciate the attached application, assuming your data channels are waveforms.

Brad Turpin

DIAdem Product Support Engineer

National Instrumnets