Time stamping of acquired data samples from NI DAQ devices.

1. DAQ cards do not have a time stamp mechanism, so we use the t0 (Buffer read time, not task start time) and dt in LabVIEW to time stamp it. Link = https://forums.ni.com/t5/Multifunction-DAQ/Loop-timing-with-NIDAQmx-for-Python/td-p/3656140
2. DAQmx does not timestamp samples when they are taken on the DAQ device, but it does when it reads the FIFO samples onto the computer if you are reading in a waveform data type.
3. Read = Reading from the FIFO buffer  into the PC
4. Acquire = Acquisition of data by the DAQ hardware
5. SOlution =  Each time you acquire, note down the time when the specific loop interation starts and then append dt to it for every column.
6. Every row is a channel
7. Every column is a sample taken in that channel.