How to increase the number of samples in my fft?

[Josv]

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

[altenbach]

Could you just acquire for multiple periods?

What kind of problem are you trying to solve by increasing the number of samples?

[Josv]

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