1.2.3.3.2.3.2 The magnetic ring is too far from the encoder chip
Note the Nominal air gap for each encoder ring. If the ring is further away than specified, the following pattern
will appear in the calibration results: irregular high oscillations and isolated points (outliers) due to high noise.
1.2.3.3.2.3.3 The magnetic ring is damaged
The two main reasons for damaged magnetic rings are mechanical scratches and demagnetization. Scratches
are typically visible and minor ones could be tolerated. Their effect on encoder performance can be observed
on the phase error curve. The resulting phase reserve should be more than 25%. On the other hand,
demagnetization can’t be observed visually or with a gaussmeter. Only the calibration procedure can be used
for diagnostics. Note that even a magnetic tip of the screwdriver can disrupt the magnetization pattern.
Attention
Please observe the general handling guidelines for magnetic rings to prevent demagnetization.
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