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Hi Ludwik,
it seems to me that what you call here 'systematic error'
is actually a bias. Aren't you mixing both concepts?
On the other hand, one can never get rid of systematic
sources of errors: The finite precission of any apparatus
introduces such a systematic error. And this is unavoidable.
Information on this source of systematic error is usually given
by the manufacturer, who has done a calibration of the apparatus.
In the absence of this information, the minimal interval you can
measure with your apparatus seems to me a reasonable estimate
(lower bound, if you want) for this systematic error.
Regards,
Miguel A. Santos
msantos@etse.urv.es