I have doubt in measuring magnitude and phase of a waveform

I am not sure which block I should use instead of "Frequency Response Function"
Attachments:
first.vi ‏54 KB

It depends on what exactly you want to achieve. If you are interested in the transfer function between 2 signals, then, as Tim mentions, the FRF VI is the one to use. However I notice in your example that you only have one signal and that signal is periodic. Are you interested in the Amplitude or RMS value of that single signal as well as the start phase of it? If yes you should condiser using the Extract Single Tone Information also located in the same palette.

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    attachment_freq.JPG ‏34 KB
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