MicroE 1500H Mercury - Manual (Page 13)

Page 11
Installation Instructions
Rotary Encoders - Using Sin/Cos Signals - Alignment
4
INDEX TRACK ALIGNMENT
The M1500H must be aligned for both the main and index tracks.
When properly aligned, the sensor will produce an index window
as the sensor passes over the index mark. The index window is
approximately one fringe wide (20µm). To verify proper index track
alignment, use a digital oscilloscope triggered on the index win-
dow. Refer to the interface drawing for the index window pinout.
Confirm proper alignment of the main track over the full range of
motion. If not aligned over the entire range of motion, loosen the
sensor mounting screws and repeat steps 4 and 5.
x
Y
Z
θ
z
5
MAIN TRACK ALIGNMENT
If benching dimensions cannot be provided, proper sensor
alignment may require minor adjustments to the sensor posi-
tion with respect to the scale. This can be performed by maxi-
mizing the sine signal from the M1500H.
Using an oscilloscope, monitor the sine or cosine signal (refer
to the interface drawing for pinouts) while moving the sensor.
Align the sensor until 0.8 volts peak-to-peak +/- 25% is
obtained. When alignment is completed, tighten the sensor
mounting screws (0.37Nm [3.3 inch-lbs.] maximum torque).
To align the sensor, move
it in the Y or
θ
z direc-
tions.
0.8 Vpp
1.7 V offset
(nominal)