"Tuning" means making fine adjustments. Without more context, I don't
think you can get a more specific answer than that. Maybe you should
quote the whole sentence or paragraph that puzzles you, so we can give a
more specific explanation.
Thank you for your replying.
For some confidental rules, I am not able to quote some sentence
here.But This "tuning" is only ranged between something about motion
control and something about servo."
There's a whole theory associated with making systems with feedback work.
Adjusting the variables involved is called "controller tuning".
Any feedback system with significant inertia or lag can oscillate,
and making such systems stable requires controller tuning.
This may be helpful:
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