Best strategies for reducing effective data collection rate?

Hi,
I'm writing a VI to collect data from cDAQ modules that have a minimum sampling rate of 1612Hz due to the master timebase (specifically 9237 and 9215 modules). I would like to log data (1D waveform with timestamps) at 100Hz for 12 hours and save this to file. THe data also needs to be displayed during this time, and data logging should be robust so there is minimal risk of data loss.
I've made one attempt at doing this previously - I used the Align and resample expressVI but this was fairly messy, and the problems I ran into were that I had errors about the maximum array size being reached, and also constant buffer overwrite errors.
I would like to basically start this VI again from scratch, and I'm wondering if there are any suggestions for an overall strategy for this? I'm not asking for any code to be written for me, just concrete shoves in the right direction regarding things like data file type, how to resample or downsample data, how to clear arrays, etc.
Thanks,
Claire.

Claire,
It appears that you are appending the resampled waveform to an empty array of waveforms and then writing the appended array to the file. What does appending to an empty array accomplish? Just write the decimated array directly to the file.
If you want to have an array of all the waveforms, then you need to use shift registers to pass the appended array to the next iteration of the consumer loop.
You do not need the sequence structure. Dataflow takes care of making things happen in order.
I do not see how the feedback node will ever change the file name as it only executes once. I am not sure what you intended, but you may want to move the file path creation inside the loop and put it into a case structure which executes when it is time to create a new file.
The attached image is an example of the way I was thinking of decimating your data.
In both my image and your program the use of build array in a loop is not a good practice it the array can get large due to memory allocation issues. Better is to initialize an array of the maximum size and use Replace Array Element to put the data into the array.
Lynn
Attachments:
Decimate waveform.png ‏83 KB

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