Time Continuity

When you acquire data in a continuous acquisition, you can use the timestamp parameter in the waveform data type to verify no gaps exist between successive blocks of waveforms returned by sequential calls to the DAQmx Read VI or AI Read VI.

When you generate signals with the signal generation VIs in the NI Sound and Vibration Measurement Suite, the timestamp parameter of the current waveform always is one sample period later than the timestamp of the last sample in the previous waveform. Continuity is enforced in this way until the generation is reset.

The waveform data type is integral for testing time continuity in the Sound and Vibration Measurement Suite. If you simulate a signal, wire a timestamp parameter value that meets the continuous timestamp condition to the waveform data type input of the measurement analysis VIs. This action prevents unexpected resets of the measurement analysis due to detected discontinuities in the input signal.