Where to start. . .
Maybe you are just doing hobby projects or you only have to do this one project then you are never going to use LabVIEW again. If you plan on using LV in the long run. GET RID OF THE EXPRESS VIs. Everything that you are doing in that program can be done using regular LV programming.
I have dump data to file programs that can run continuously at 20 kS/s (probably faster) sample rates. They write to file in chunks generally once a second sometimes once every 10 seconds.
Right now the reason that the data is going out at 0.1 sec is because you are acquiring 100 data points at 1kS/s. Maybe write to Excel can not write any faster due to overhead of opening the file, etc. I am not sure as I only use it from time to time and when I do it is a more complicated structure (multiple tabs with embedded images, etc.)
Second consider writing to text files rather than Excel. If you do them as tab delimited text and make the file extension .txt you can drag and drop them into Excel and they will open right up. That being said you should be able to use Excel files for this.
Right click on your DAQmx task and select "Create DAQmx Code" That will create the code Remove the do while loop that it created because you said acquire 100 points continuously. Drag the Untitled 1 subvi out of of the main loop. Drag the clear task out of the loop to the right. Now your program sets up an acquisition, goes into the loop where it starts the task, takes the data and processes it.
Open that untitled 1 subVI and and open the diagram. Copy everything in it and replace the untitled 1 subVI with this code. On the sample clock setup change the continuous samples to finite samples because that is the structure that you are using.
Next go right click in your diagram and select
Signal Processing -> Waveform Measure
This has all of the signal processing stuff that you are doing in your program.
Once you get all of those discrete values that you need use build array to build your output data stream.
The other question is what is your output. When I simulated your input function with 10 cycles of a sine wave and created a numeric indicator for the output of your merge just before you wrote to a measurement file I got a single value.
For writing multiple data values to a file where each array of values is generated in each iteration of your loop I use the general structure of create a file and write the column headings to the file, pass the file refnum into the loop. Then point to the end of the file and write the next line of data. You create the line of data by taking the 1D array of data and using the string function of array to spreadsheet string.
There are other similar posts regarding acquiring data etc. on this forum. Go back and look at them looking for the advice given by others regarding getting started writing DAQmx code, etc.
PS Learn to write in state machine format for programs like this. It makes it easier to keep track of things.
Init
Set up data file
Set up acquisition
Take data
Process data
Write data to file
What next
Exit
Error(default)
Start at init. At what next loop back to take data except when you want to exit. Close the file and DAQ task in the exit and error states.
