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IEVref: | 351-46-09 | ID: | |

Language: | en | Status: Standard | |

Term: | Nichols plot | ||

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Definition: | diagram showing gain and phase angle contours of the closed-loop frequency response $\frac{{G}_{0}}{1+{G}_{0}}$ plotted in the rectangular coordinates of logarithmic gain and phase difference of the open-loop frequency response G_{0}Note 1 to entry: $\frac{{G}_{0}}{1+{G}_{0}}$ is the closed-loop frequency response for changes of the reference variable in the case that the controlled variable Note 2 to entry: This entry was numbered 351-25-09 in IEC 60050-351:2006. | ||

Publication date: | 2013-11 | ||

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Note 1 to entry: $\frac{{G}_{0}}{1+{G}_{0}}$ 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.