Process Control and Instrumentation
Nichol's chart deals with

R. vs. phase lag of first order
R. vs. phase lag of second order
Closed loop values vs. open loop values
Frequency response values of controllers

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Process Control and Instrumentation
Routh test

Criterion provides information about the actual location of roots
Criterion is not applicable to systems with polynomial characteristic equation
Cannot be used to test the stability of a control system containing transportation lag
Can not determine as to how many roots of the characteristics equation have positive real roots

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