Analog Input >> Frequency >> Voltage >> Threshold Level

NI-DAQmx C Properties

Analog Input >> Frequency >> Voltage >> Threshold Level

Data Type: float64
Description: Specifies the voltage level at which to recognize waveform repetitions. You should select a voltage level that occurs only once within the entire period of a waveform. You also can select a voltage that occurs only once while the voltage rises or falls.

You can get/set/reset this property using:
  DAQmxGetAIFreqThreshVoltage
  DAQmxSetAIFreqThreshVoltage
  DAQmxResetAIFreqThreshVoltage