You can start by taking a look at datalogging examples at /examples/file/datalog.llb. There are several datalogging examples, including one which simulates data, but you could easily replace that with your data from the DAC-1200.
If that's not exactly what you want, storing data to the drive is relatively simple. I can write you a vi that you can put in a loop, and it will put a header and write the data.
Mark
