How to increase the number of samples in my fft?

Hi,
In my Labview environment I receive sampled data of a sinus function where one period consists of 4096 samples. How can I increase or control the number of samples which the fft spectrum is using for calculating its results?
Best regards
Jonny

Hi,
The sinus signal is generated to have a fixed frequency, but as seen in the figures the fft has a big SNDR. I hope do decrease this with adding the number of samples.
Thanks
Attachments:
power_spec.JPG ‏50 KB
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