Renishaw XL-80 - Appendix C: Quadrature Output; Quadrature Output Details

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Appendix C
Quadrature output
Quadrature output is available as a factory-set option on the XL laser�
The quadrature output allows ‘raw’ interferometry signals to be supplied to
custom-designed circuitry, to allow, for example, the laser to be used as a
linear encoder system� The quadrature signals are accessed via a connector
on the XL laser rear panel (see Auxiliary I/O connector pinout)� Resolution is
dependent on the conguration of the DIP switches (Switch 2 off = 80 nm, on
= 10 nm)�
Do not use the quadrature output facility of the XL laser to provide closed loop
feedback control for a machine� The system is not designed to be used for
feedback control and injury could result if used for this purpose�
XL-80Q may have export control restrictions in your region�
AQuad
Pitch
Resolution
BQuad
λ/2 or λ/16
λ/8 or λ/64
Format
These signals are not compensated for changes in the refractive index of
air� The A, /A, B, /B, ALARMOUT and /ALARMOUT signals are provided in
RS422 balanced differential line format�
Resolution
The ‘A’ QUAD ‘B’ signals are represented in diagram below�
Figure 3 Resolution of quadrature signals�
The maximum quadrature resolution can be selected as λ/8 (approximately
80nm) or λ/64 (approximately 10 nm), giving a pitch of λ/2 or λ/16
respectively�
XL-80 Hardware