OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
Incremental Hollow Shaft Encoder
OPE1275H Single Channel (Tachometer)
OPE2275H Dual Channel
OPTEK Technology Inc. — 1645 Wallace Drive, Carrollton, Texas 75006
Phone: (972) 323-2200 or (800) 341-4747 FAX: (972) 323-2396 sensors@optekinc.com www.optekinc.com
Issue A.4 10/09
Page 4 of 4
Timing Definitions:
PPR = Pulses Per Revolution
Electrical Degree (°e) = 1/360th of 1 cycle
Cycle = 360 electrical degrees (°e)
Symmetry = Relationship between X & Y in electrical
degrees (°e).
Position Error = The difference between the actual
shaft position and the position indicated by
the encoder cycle count.
Quadrature: The lead or lag difference between
channels “A” and “B” in electrical degrees
(normally 90°e)
Cycle Error = The difference between the actual shaft
rotational position and the cycle count
rotational position.
Rise Time = Time required to switch between 10% and
90% of the highest to lowest signal levels.
Fall Time = Time required to switch between 90% and
10% of the highest to lowest signal levels.
Timing Diagram:
Hollow Shaft Assembly Instructions:
Make sure the kit has all required parts:
• 1 each Base Unit
• 1 each Base Unit Alignment Tool
• 1 each Aperture Plate
• 1 each Encoder Wheel Assembly
• 1 each Wheel Assembly Alignment Tool
• 1 each Reflective Lid
• 4 each #2-56 self tapping screws
1. Peal the protective covering from the adhesive on the
back of the Base Unit.
2. To center the Base unit, carefully slide the Base Unit over
the flange on the motor and press firmly.
3. Place the Aperture Plate on the Base Unit.
4. Slide the Encoder Wheel Assembly over the motor shaft
until it almost touches the Aperture Plate.
5. Carefully place the Reflective Lid on the encoder (rotate
as necessary to align) and attach with 4 #2 self tapping
screws (provided).
6. Connect the electrical interface to the encoder.
#2 screws
Reflective Lid
Encoder Wheel
Assembly
Aperture Plate
Base Unit
Adhesive Cover
