DAQmxConfigurLogging C API

Question

I use the NI-PCI 6225 card.

I want to read the 1000 samples with the time of each sample. I used

DAQmxConfigurLogging C API, but in the TDMS file that was generated, there was no time for each sample.

What should I do to achieve this?

Answer 1

It sounds like you're using a continuous or finite acquisition. If that's the case, the TDMS file will store a waveform, which has three properties:

• The start time ( t0 ) -- this is the wall-time of the first sample
• The sample period ( delta_t ) -- this is the time between each sample
• The array of samples -- these are measured values

To get a time for each sample, use this formula:

time_at_sample_n = t0 + (n * delta_t)