Analog Input >> General Properties >> Filter >> Analog Lowpass >> Cutoff Frequency

NI-DAQmx C Properties

Analog Input >> General Properties >> Filter >> Analog Lowpass >> Cutoff Frequency

Data Type: float64
Description: Specifies the frequency in Hertz that corresponds to the -3dB cutoff of the filter.

You can get/set/reset this property using:
  DAQmxGetAILowpassCutoffFreq
  DAQmxSetAILowpassCutoffFreq
  DAQmxResetAILowpassCutoffFreq