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Figure 2
Comparison between the 22-bit (resolution 360°/222) absolute rotary encoder (JX130) and the precision incremental rotary encoder (ROD800, resolution 0.00005°, accuracy 1 arcsec). (a) All measurement points from 0 to 360° with an angular interval of 0.006°. Data concerning the ROD800 and the JX130 encoders are plotted using the right and left Y axes, respectively. (b) Enlarged view of the part from 180 to 240° in (a). The oscillation with a period of 2° is due to the pitch variation of the worm gear in the RA20-02 goniometer. (c) Enlarged view of 192 to 196° in (a). The ripples with dots are characteristic systematic errors of the JX130.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 5| Part 3| May 1998| Pages 955-957
https://doi.org/10.1107/S0909049598001253
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