7
Rop
12.60
6.30
0.50
ARTWORK
Codewheel
MOUNTING BOSS
2MM DIA.
2 PLACES
OPTICAL CENTER AXIS
GAP TYPICAL
E
G
E
T
E
R
SHAFT
CENTER
AXIS
OPTICAL
CENTER
AXIS
MOUNTING PLANE
R0.89
Mounting Considerations
Recommended Screw Size: M1.6 x 0.35
Recommended Mounting Screw Torque
: 1 Lbin (0.113 Nm)
Note:
These dimensions include shaft endplay and codewheel warp. All dimension for mounting the module and codewheel
should be measured with respect to two mounting boss, as shown above.
Error Rop = 11mm
Unit Notes
E
G
Gap ± 0.20 mm Recommend to mount the codewheel closer to the detector side
(upper side) for optimum encoder performance.
E
R
Radial ± 0.13 mm
E
T
Tangential ± 0.13 mm
Note: The customization of codewheel method is valid from theoretical
standpoint. However Avago Technologies strongly recommends a full
characterization to be done to determine the actual performance of
the encoder with customized codewheel.
Characterization means validating the encoding per-
formance (consist of cycle error, pulse width error, logic
state width error, phase error, position error & index pulse
width , index channel rise and fall time) over the recom-
mended operating conditions and recommended mount-
ing tolerances.
CPR calculation formula:
CPR = (LPI x 25.4) x 2 x π x ROP
Where:
CPR = Counts Per Revolutions
LPI = Encoder LPI provided in the table
ROP = Encoder Optical Radius in mm
* Recommended maximum Codewheel diameter should not exceed
30mm
