Counter Input >> Frequency >> Measurement Specifications >> High Frequency >> Measurement Time

NI-DAQmx C Properties

Counter Input >> Frequency >> Measurement Specifications >> High Frequency >> Measurement Time

Data Type: float64
Description: Specifies in seconds the length of time to measure the frequency of the signal if Method is DAQmx_Val_HighFreq2Ctr. Measurement accuracy increases with increased measurement time and with increased signal frequency. If you measure a high-frequency signal for too long, however, the count register could roll over, which results in an incorrect measurement.

You can get/set/reset this property using:
  DAQmxGetCIFreqMeasTime
  DAQmxSetCIFreqMeasTime
  DAQmxResetCIFreqMeasTime