R
Repeatability
Repeatability describes the precision of multiple moves to the same point within a short time period (from a few milliseconds up to five minutes).
During repeated moves to a position within a short time period (from a few milliseconds up to five minutes), deviations will occur between the repetitions. For a warmed-up system (warm-up: 30 minutes) with steady ambient temperature and operational conditions, the imprecision's standard deviation (RMS) lies within the specified range. Here, it is assumed that dither averages out.
Systems with digital encoders have clearly superior repeatability.