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Which of the following methods tells Absolute stability & which method tells Relative Stability? I. Bode Plot ii. Routh Hurwitz iii. Root Locus iv. Nyquist Plot

What i think is the following correct me if I am wrong. I. Bode Plot (tells only relative stability) ii. Routh Hurwitz (tells only absolute stability) iii. Root Locus (tells about both stabilites) iv. Nyquist Plot (tells about both stabilites)

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    \$\begingroup\$ Is this an exam question? \$\endgroup\$ Commented May 30, 2021 at 13:02
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    \$\begingroup\$ A question appeared to me in exam similar to this.... \$\endgroup\$ Commented May 30, 2021 at 13:04
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    \$\begingroup\$ What's the difference between absolute and relative stability? \$\endgroup\$ Commented May 30, 2021 at 13:14
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    \$\begingroup\$ Relative stability and absolute stability are not two different "kinds" of stability. Absolute stability is a binary thing, is the system stable or not? Relative stability will tell you, if your system is stable, by how much can you increase the gain of the system or the phase lag of the system before it becomes unstable? \$\endgroup\$ Commented May 30, 2021 at 13:15
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    \$\begingroup\$ R-H criteria only gives the necessary criteria for absolute results. \$\endgroup\$ Commented May 30, 2021 at 13:36

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