Labview - Setting arbitrary waveform output sample rate

[cereus01]

I have a labview vi that downloads waveform data to the RP with the output being produced on an external trigger event.

I am yet to work out how the arbitrary waveform output sample rate is set, I have seen a vi that suggests setting up a standard waveform on the same channel with amplitude and frequency set.

Changing the frequency value does appear to alter the output sample rate but the numbers I have to use do not appear do not appear to tie up with the sample rate achieved.