How to save multiple waveforms to excell spreadsheet

Question

Hi Everyone,
So I just got a new project in lab which is to use our new DAQ board(NI USB 6341) to read a voltage from 5 PMTs.  I'm new to labview, and am struggling quite a bit but here's what I've done and would like to accomplish:
My example today uses two channels sampled at 1K.
1.Interface with the deivice and create a Task to measure from more than one channel. -Complete
-In my example code I have the sampling rate at 1k and N samples at 100.  Eventually I would like to sample at 100Khz. What is an appropriate N samples?
2. Generate Labview code that will continuously take data untill I tell it to stop and bring each channel to its own tab delimited column on the write out file.
I cannot get step two work correctly.  My understanding was that the DAQ assistant in my example outputs a 1D array of waveforms and that "Export Waveforms to Spreadsheet file" VI would read each element as its own array but I cannot get it to do that.
3. Graph in real time the two channels 10 seconds at a time. I.E I want it to continuously have a 10 second window([1,10],[2,11]...[101,111]) etc. so that way I know the current run time for sampling and I can see the current events.   This is a tricky situation because I want each to have their own plot and I haven't found a good way to use the register to append new data without eventually running out of memory.  The other issue is that when I append the data it shows from 0 seconds to my current time, I would like it to show me the waveform in time as discussed above.
If I could get some help on either of these two fronts, I would be immensely greatful.  Thank you so much for your help, and for reading this
Best,
-Joe
PS- Attached is my code.  Give it a run and see what it does to understand things a little better please.
Attachments:
Read Voltage.vi ‏60 KB

Answer 1

Okay so the charts ended up working out nicely if I wanted to sample at 1kHz and have samples to read=100
But If I now up my sampling rate to 100kHz and 25k samples to read for 5 channels I immediately receive the error message:
"Attempted to read samples that are no longer available. The requested sample was previously available, but has since been overwritten.
Increasing the buffer size, reading the data more frequently, or specifying a fixed number of samples to read instead of reading all available samples might correct the problem."
I guess my first question, would be what is happening that is making the VI crash right away, the DAQ board can handle 500KHz across all channels so that is not the issue, how can I create my VI to handle this amount of data?
Attachments:
Read Voltage.vi ‏94 KB