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According to Liptak, in the latest edition of his book "INSTRUMENT ENGINEERS' HANDBOOK", noisy process signals should be smoothed or averaged.
A mathematical formula is presented which depends on 2 parameters: the sampling period and the filter time constant (Tau). "Tau" relates how far
back in time data are to be averaged. My question is, how to choose an initial value for the filter time constant before to tune a process control
loop where there are noisy process variables? I'd like to get some technical references on that subject (if any) as well.
Thanks,
Miguel Borges
Eng. Miguel Joao Borges Filho
Research and Development Center of Petrobras
Industrial Basic Design Division
Cidade Universitaria - Quadra 7 - Ilha do Fundao
Rio de Janeiro - RJ - BRASIL
A mathematical formula is presented which depends on 2 parameters: the sampling period and the filter time constant (Tau). "Tau" relates how far
back in time data are to be averaged. My question is, how to choose an initial value for the filter time constant before to tune a process control
loop where there are noisy process variables? I'd like to get some technical references on that subject (if any) as well.
Thanks,
Miguel Borges
Eng. Miguel Joao Borges Filho
Research and Development Center of Petrobras
Industrial Basic Design Division
Cidade Universitaria - Quadra 7 - Ilha do Fundao
Rio de Janeiro - RJ - BRASIL