Aligna
®
4D User Manual
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Measured Total Matrix, is close to Unity Matrix
The measured Total Matrix shown here is close to a unity matrix (close to "1" in the diagonals,
close to "0" in the off-diagonals). (Normally the section "Total Matrix" is hidden, it can be un-
shrinked for observation.)
The average deviation of the measured total matrix from the aspired unity matrix is displayed.
10.3.10.6 Measurement, starting with misaligned Matrix
In the following example we start with (a completely wrong) OCL matrix: We select "OCL=1",
so the OCL is set to unity matrix: Ax turns Motor 1x, Ay turns 1y, Bx turns 2x, By turns motor
2y. The measurement looks as follows:
You can see a clear correlation between set values (red, green, blue, yellow) to the measured
values (dark red, dark blue, dark green, brown), but the sign and the gain factors are com-
pletely wrong. The calculated remaining error is large. Many of the measurement points are
clipped, or even gone back to zero, because one of the detectors was no longer hit. (Even if
most points cannot be used, the system can usually calculate a better OCL matrix.)
The system now proposes the correction of the OCL.
If you agree, the system will calculate/accept a corrected OCL matrix.
When you repeat the measurement now, you get a much better result:
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