Counter Input >> General Properties >> Counter Timebase >> Rate

NI-DAQmx C Properties

Counter Input >> General Properties >> Counter Timebase >> Rate

Data Type: float64
Description: Specifies in Hertz the frequency of the counter timebase. Specifying the rate of a counter timebase allows you to take measurements in terms of time or frequency rather than in ticks of the timebase. If you use an external timebase and do not specify the rate, you can take measurements only in terms of ticks of the timebase.

You can get/set/reset this property using:
  DAQmxGetCICtrTimebaseRate
  DAQmxSetCICtrTimebaseRate
  DAQmxResetCICtrTimebaseRate