Color Map not showing time-dependent change

[TimRsandiego]

I am using the latest Sound and Vibration Measurement Suite in Signal Express.  I have a Spectral Map step in my program, which includes a Color Map.  I am recording an accelerometer's transient response to an impact, and want to see the time-dependent frequency intensity changes as a function of time, so a color map should be perfect.  I have no problem recording the accelerometer's transient response in a time graph, and I also see the power spectrum in another graph.  While the color map indeed shows various frequencies at different intensity levels, I don't see the intensity of any of the frequencies change over the course of the 200 ms that I'm recording, while the time graph clearly shows the decaying waveform.  Why doesn't the color map show a decrease in intensity of the respective frequencies as time progresses through the transient?  I have everything set up to display and record the first 200 ms of the impact.  At the end of this period, the intensity should go to almost zero.

Please see the attached .seproj file to review the parameters I have set.

Also, with the same .seproj file, I will occassionally get a Buffer Overflow error.  From this file, can you tell me what setting I need to change.  But I need to make sure that all data both displayed and recorded, is for the 200 ms timeframe specified (10 ms before the trigger and 190 ms after).  The ADC I'm using is an NI 9234 in a cDAQ-9172 chassis.

Thanks,

--Tim

[Frank-L]

Tim,

I am trying to figure out where this would be able to recognize the changes since the data would be taken from an analysis of one .2 second signal. Have you tried to analyze more than the one signal taken in? When I ran this project I got the display on the bottom right to show one signal as having been read which makes sense when looking at the data. If you wanted to see the changes over the 200 ms timeframe I would have it run continuous DAQmx acquires for that timeframe. It appears the analysis that we see stays static because it is doing analysis of only one data set that came in. I would think that the change in time that you want to see would have to have analysis done on multiple sample sets to notice the differences from one set to the next. 

[TimRsandiego]

I'm not sure I understand your question, but I don't think I can analyze the signal over more than one time period. The reason is that this is a transient analysis.  I am impacting a target (containing an accelerometer) with a projectile, and recording the resulting transient.  I want to analyze just 200 ms of the transient (10 ms before the trigger, and 190 ms after the trigger).  So, I don't think I can analyze multiple time periods, because the transient will be noticeably decayed in subsequent time periods, unless I'm misunderstanding what a "time period" is.

--Tim

[Frank-L]

Tim,

I had some trouble opening it here on my end, which is what gave me some confusion. Is there any way that you could post a screenshot of the colormap after you run it on your end? I tried to make a VI in labview to do the colormap with your data and got a reasonable result on my end.

[TimRsandiego]

Frank--

I have a new guy taking over for me for all of the Signal Express stuff.  I will ask him to submit a screenshot.

Thanks,

--Tim