List the disadvantage or draw back of static error coefficient method

 Ans :

1) This method cannot give the error, if inputs are other than the 3 standard test inputs.

2) Most of the times, this method gives mathematical answer of the error as 0 (zero) or ∞ (infinite) and       hence does not provide precise value of the error.

3) This method does not provide variation of error with respect to time, which will be otherwise very useful             from design point of view.

✴  Because of these disadvantage dynamic error coefficient is developed which eliminates above this disadvantage.