MicroE 1500H Mercury - Manual (Page 9)

Installation Instructions
Linear 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 oscillo-
scope triggered on the index window. 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 mount-
ing screws and repeat steps 4 and 5.
x
Y
Z
θ
z
To align the sensor, move it
in the Y or
θ
z directions.
5
MAIN TRACK ALIGNMENT
If benching dimensions cannot be provided, proper sensor
alignment may require minor adjustments to the sensor
position with respect to the scale. This can be performed
by maximizing the sine signal from the M1500H.
Using an oscilloscope, monitor the sine or cosine signal while mov-
ing the sensor over the scale (refer to the interface drawing for
pinouts). Align the sensor until 0.8 volts peak-to-peak +/- 25% is
obtained. When alignment is completed, tighten the sensor mount-
ing screws (0.37Nm [3.3 inch-lbs.] maximum torque).
Page 7
0.8 Vpp
1.7 V offset
(nominal)