[billbo911]

While you are gathering the info Ether requested, let me give you some of the common problems we have experienced with these encoders. BTW, these encoders work well if you know when and how to use them. That information should be borne out when Ether shows you how to do the calculations.

Some common problems:
1) The encoding disk may not be spaced correctly from the optical sensors. Use the alignment tool provided with the encoders to space them properly.
2) There may be smudges (finger prints) on the disk. Clean it VERY CAREFULLY and re-install.
3) The disk may be loose on the shaft. This is VERY common. Gently tighten the fingers with a pair of pliers on one side of the disk ONLY! Re-install the disk.
4) The pins on the wires may not be crimped properly on the conductor/wire. There may be insulation inside the crimp. Inspect the pins with a magnifying glass and correct if necessary.
5) Run-out on the shaft may exceed the operational tolerances. Locate and correct the cause of the run-out.

#3 is the most common issue we have seen when the encoders are intermittent.

Make sure these items are correct and you should be in good shape.