diagram showing gain and phase angle contours of the closed-loop frequency response  plotted in the rectangular coordinates of logarithmic gain and phase difference of the open-loop frequency response G0Note 1 to entry: is the closed-loop frequency response for changes of the reference variable in the case that the controlled variable x is used as the feedback variable r directly. The transfer function of the measuring element is assumed unity. Note 2 to entry: This entry was numbered 351-25-09 in IEC 60050-351:2006.
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