The way that I do this is to have a loop for the measurement data go from card acquisition into a queue, and then another loop for the measurement data to go from the queue to the TDMS reference. This way, you can close your TDMS reference based on some metric, such as file size or number of hours, and then open a new TDMS reference with a new file name. I use filenames based on the current time/date, which makes data management easier. While the first TDMS file is being closed and the second TDMS file is being opened, your queue will be accumulating data, so just make sure that your queue is big enough to hold the data during that time period. Having a queue is also generally a good idea to avoid losing data during continuous data writing. Be sure that the queue-reading loop occurs faster than the queue-writing loop during regular operation.
