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6 Description of the test results 6.21 Segment offset up (SOO) Software Manual SIPLACE Head Verification 03/2018 79 6.21.2 Measurement result Fig.55: Result view – Segment offset up (SOO) 1 Measured Segment 2 Up X shows…

6 Description of the test results

6.21 Segment offset up (SOO)

78 Software Manual SIPLACE Head Verification 03/2018

6.21 Segment offset up (SOO)

6.21.1 Measurement principle

The Segment offset up measurement checks the degree to which a segment is outside of its rota-

tion axis in the top position. This eccentricity is also known as segment offset up.

Segment offset up is the offset of the segment center in the up position to the center of the

component camera.

The measurement is performed for each segment in the top position at four angles (0°, 90°, 180°

and 270°) to determine the exact rotation and to calculate the influence of the segment / Z-axis lin-

earity.

NOTICE

Segment offset down not available at the HCS

The Segment offset down measurement requires a stationary camera which is not available

at the HCS. Therefore, this test is only available with the online verification.

NOTICE

Termination of test sequence

If a measurement shows a segment outside the allowed limits, all subsequent measure-

ments will be terminated. It is assumed that the segment is seriously deformed and that the

head is no longer able to perform.

► Replace the segment immediately before performing other measurements.

6 Description of the test results

6.21 Segment offset up (SOO)

Software Manual SIPLACE Head Verification 03/2018 79

6.21.2 Measurement result

Fig.55: Result view – Segment offset up (SOO)

1 Measured Segment

2 Up X shows the mean value of the 4 Up X measurements at different angles.

Up X

Segment(n)

= Mean Up X

Segment(n0°, n90°, n180°, n270°)

3 Up Y shows the mean value of the 4 Up Y measurements at different angles.

Up Y

Segment (n)

= Mean Up Y

Segment (n0°, n90°, n180°, n270°)

4 Result view indicating if the values are within (green tick) or outside (red cross) the limits.

5 Graph showing the Up X and Up Y values for each segment.

●

Variation Up X shows the mean value of all Up X values.

●

Variation Up X = Mean

UPx(n)

●

Variation Up Y shows the mean value of all Up Y values.

●

Variation Up Y = Mean

UPx(n)

7 Live image of the calibration tool being measured.

6 Description of the test results

6.21 Segment offset up (SOO)

80 Software Manual SIPLACE Head Verification 03/2018

6.21.3 Interpretation of the results obtained

‘Up X’ and ‘Up Y’ error for all segments

Cause Solution

Incorrect zero point correction of the star ► Check the zero point correction of the star.

Component sensor defective or polluted ► Clean or replace the component sensor.

‘Up X’, ‘Up Y’, ‘Down X’ and ‘Down Y’ error for individual segments

Cause Solution

Segment bent, possibly after crash ► Replace the segment (DP).

Linear bearing of segment defective ► Replace the linear bearing (DP).