stuck with plotting FFT of chirp signal in simulink

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Aniket
Aniket 2013-4-7
hello ,
I want to plot fft of chirp signal. I am using chirp signal block from simulink and connected to zero order hold and then FFT spectrum scope but when i am running simulation , th display of spectrum scope not displaying anything.
I have put buffer size 256 , then FFT length 256 and spectrum type Two sided.
any one is having idea what is wrong

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