Wilroy

Hello LAVA, I have four analog voltage signals coming into an SCB-68 and a PCI-6259 M. I would like to sample the four signals at 10 ksamples per sec, for a duration on the order of a couple of minutes. I use a DAQmx read and Export_Waveforms in a while loop, as shown in the attached image (Acq.jpg). I find there are blank rows distributed through out the output file, as shown in the attached image (Textfile.jpg). These blank rows have zero values associated with them that are undesirably inserted into the acquired signals. It seems a null row is inserted at every iteration of the while loop. The frequency of null row occurrence and number of null rows per occurrence seems to depend on sampling rate and loop execution time (experimented with putting Wait_until_next_ms_multiple in the loop). Suggestions on how to remove these rows with null values would be greatly appreciated. I am running LabVIEW 8.5.1 on XP. Cheers, Wilroy.