Type: SystemTimeSpan The duration of time to read the waveform. The duration specified must be long enough to read at least one sample at the configured SampleClockRate.
data
Type: NationalInstrumentsAnalogWaveformDouble An initialized 1D array of AnalogWaveformTData that contains the read data. Each element in the array corresponds to a channel in the task. The order of the channels in the array corresponds to the order in which you add the channels to the task or to the order of the channels you specify in ChannelsToRead.
If the data waveform is large enough to hold the number of samples requested, this overload attempts to reuse the existing AnalogWaveformTData objects' memory to store acquired data. This results in more efficient memory allocation when performing subsequent reads with a continuous analog input task, if each subsequent read acquires the same or fewer number of samples.
NI-DAQmx scales the read data to the units of the measurement, including any custom scaling you apply to the channel. You specify these units when creating channels using the create channel methods or the DAQ Assistant.
The data returned from analog waveform reads is affected by the WaveformAttributeMode property of the DaqStream being read.
NI-DAQmx read and write methods time out after the amount of time specified by the Timeout property on the Stream object used for the reads or writes.