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Old 07-26-2017, 07:03 AM   #11
bezusheist
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Quote:
Originally Posted by Robert Randolph View Post
So, how do we know that Fuzzmeasure's plot isn't incorrect?

What's the predicted phase response for this filter?
Fuzzmeasure gives me consistent measurements with various (brand) filters and seems to be in sync with "ideal" plots. (seems to work fine for IIR filters.) theres a bunch of stuff you can check/make plots for PC, but i am mac so i use what i can get. R.E.W. gives me the same plots.

the filter is a 12 dB Butterworth filter, so you can probably find a bode plot somewhere for the ideal phase response. or even the math.
but like i said, the important thing to note here is for this type of filter's phase response, the corner is at 90 degrees...ReaEQ (with butters Q) shows it at 180.
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