Warning messages during the identification process

STAN Tool will warn the user when the simulated transfer function H₀(jω_S) presents some of the following characteristics:

SISO method :

• The variation range of the magnitude of the frequency response is excessive
  
  
  
  
  
  
  
  

• The algorithm cannot achieve the phase tolerance value.
  
  
  
  
  
  
  
  

• Only mathematical poles are detected during the identification process.
  
  
  
  

DACWIN method :

• Numerical noise: risk of overmodeling, relax the phase tolerance.
  
  
  
  

• In extremely noisy frequency responses, the DACWIN method may try to continue the division in smaller sub-bands to infinity. The warning message is: “Maximum phase tolerance used. Your original curves might be too noisy to be identified. Please use manual order to avoid any identification problem.”

SISO/DACWIN method:

• Phase tolerance value at the end of the identification when using the advanced option Sensitivity Policy ==> Release Tolerance Once