Numerik Jena RIK 4 Manual
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Contents
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SIMPLY PRECISE136. Technical Data6.1 Resolution and Accuracy (Definition)Basically one has to differentiate between the resolution and the accuracy of a measuring system. Thetwo parameters are not directly interdependent and may differ from each other.6.2 ResolutionResolution “A“ is defined as the smallest angular value that is still detected by the evaluating electronics(display, control) when the grating disk is turned relative to the scanning head. The resolution can becalculated using the following formula:A = Z · i · N [Increments/Revolution]A = 360° [Degrees]Z · i · NZ Number of lines (grating disk)i Interpolation factor of the evaluation electronics(5-times, 10-times, 25-times, 50-times or 100-times)N Factor for evaluation mode (counter)N = 1 for single-edge evaluationN = 4 for 4-edge evaluation6.3 AccuracyAccuracy (extremes of direction deviations) is affected by• Graduation errors of the grating disk• Eccentricity of the graduation relative to the axis bearing• Radial eccentricity of the axis bearing• Deviations in the positions of the grating disk and the scanning head (mounting tolerances)• Interpolation error in signal processingThe accuracy is largely determined by the eccentricity of the graduation relative to the axis bearing andthe radial eccentricity of the axis bearing. The error resulting from these factors is calculated using thefollowing formula:Δ ϕ = ± 412 eD Δϕ Angular error [Arc seconds]e Eccentricity of the graduation relative to the rotational axis includingthe radial eccentricity of the axis bearing [μm]D Graduation diameter of the grating disk [mm] |
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