dbb, so jaded in such a short time,
I'm am certainly no expert, but l play with a PID regularly with my yacht auto pilot (which there has been a few posts about) which is a quick changing PD and work with process PID's which change relatively slowly there for maybe easier to tune, but like Peter and now yourself (just a little bit) and l, l just can't believe how poorly the op's approach their projects/problems. I know a while ago a long time member played up (said he wasn't coming here again) l believe because of a post l wrote, that the person should read the manual, he took offence of what l wrote, it seemed he felt that any idiot should be able to ask a question here (which they can) and it seemed that he felt that people should pass on very hard earn't experience learnt over count less decades, because said idiot asked a question without even opening the manual.
Next ***** is someone who starts the thread with "URGENT HELP REQUIRED" someone helps and the op never comes back to say thanks or explain what fixed the issue for others to gain possible answers for later.
I personal can't understand why the specialists on this site even answer any questions, l come from the school of work it out for yourselves, if you can't work it out, you shouldn't be in the position you are in.
Like this thread, the op's should read the answers given and answer the question asked, so people here don't just go round in circles, how hard can it be.
Peters image is a classic, someone pulling tooth along. mark.t should answer questions, or not ask and go buy a tuning software for $1000's, or read some books, THEN come and ask more pertinent questions and supply answers to questions asked.
Atleast he didn't ask what is a PID, because l have to tune one