Open scope and paste this script into the
command window.
Then press <Ctrl + R> to plot a square wave
Select the Calculator menu "Build/Pulse/Complex/FFT
init/FFT 256 point. then press f to get the 256 point transform.
numpoints = 256
time = (vector(numpoints)/(numpoints-1)*1m)
newplot pulseplot time
setplot pulseplot
y = 2*pulse(500u) - 1
plot y
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