Help to do a frequency analysis with Simulink

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houly

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Hello all,
I saw that Simulink have a spectrum analyzer, I would want to simply analyze a signal generator like PWM or sawtotth signal and what happens on spectrum. So I put the Pulse generator and the spectrum analyzer but there is two input on the spectrum analyzer ... ?how should I connecte them correctly ? Does it gives me directly the power (in dBm) ? if not, how can I do to do it ?

I hope that you could help me...

PS : I use Matlab 2010a version.
 

Nobody to help me ?
 

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