Hello Beauty!
Did you find the answer of your question? I have the same question and wondering if can provide me the answer. Thank you, H 
There is no sampling frequency option. There is only a sampling interval.
Sampling Interval = 1 means sample every timestep Sampling Interval = 2 means sample every other timestep To achieve a certain sampling frequency (with units 1/s), you must choose the sampling interval and timestep size accordingly. The relation between frequency, sampling interval, and timestep size given was correct. frequency = 1/(stepsize x sampling interval) 
Thank you LuckyTran!

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sample interval = 200 means it will calculate average value of all 200 time steps. is it right? i am using delta_t = 10^6, could you please suggest me what sampling interval should i use? thank you 
It means it will collect data each 200 time steps. Hence, after the first 200 time steps, your statistics will coincide with the instantaneous field saved at the 200th time steps.
To do what you wrote you need sample interval = 1. This, btw, is always your best choice if you don't know what you're doing. 
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if i select select sample interval =1 or 10 then i should save Data and case file for every 1 or 10 time step respectively. if sample interval is 3 and autosave of data and case file is 100 then i wont get u', v' and w' at any time step. am i right? if not then please explain. thank you 
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