Arduino Uno sampling rate

Period : 20ms a full cycle

How to have a sample rates at 2400 samples/s?

If you're sampling analog, I believe each operation requires about 140 usec. That might be possible, but only if your code isn't doing much else. If your sampling digital, I suppose the time is much less.

Sense wait until the next 1/2400 second tick repeat

Is that what you were asking for? What's your signal like? Does it have negative voltage within the period?

uncleeee: Period : 20ms a full cycle

How to have a sample rates at 2400 samples/s?

In what way is this a programming question? Or indeed a question that makes any sense? Please post your code.

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