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IEVref:351-46-09ID:
Language:enStatus: Standard
Term: Nichols plot
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Definition: diagram showing gain and phase angle contours of the closed-loop frequency response G 0 1+ G 0 MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaiqaciWacmGadaGadeaabaGaaqaaaOqaamaalaaabaGaam4ramaaBaaaleaacaaIWaaabeaaaOqaaiaaigdacqGHRaWkcaWGhbWaaSbaaSqaaiaaicdaaeqaaaaaaaa@3A6B@ plotted in the rectangular coordinates of logarithmic gain and phase difference of the open-loop frequency response G0

Note 1 to entry: G 0 1+ G 0 MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaiqaciWacmGadaGadeaabaGaaqaaaOqaamaalaaabaGaam4ramaaBaaaleaacaaIWaaabeaaaOqaaiaaigdacqGHRaWkcaWGhbWaaSbaaSqaaiaaicdaaeqaaaaaaaa@3A6B@ 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.


Publication date:2013-11
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