Clock/Pulse Frequency Coercion
Frequencies of clocks or pulse trains must be evenly divisible into the frequency of its timebase. For example, the rate of the Sample Clock must be evenly divisible into the frequency of the Sample Clock Timebase. If you specify a Sample Clock rate that is not evenly divisible into the frequency of the Sample Clock Timebase, NI-DAQmx coerces the Sample Clock rate to one that is valid.