ACT - Accuracy Check Tool mit SSW 6xx User Manual 2017 - 第119页
ACT with SSW 6xx / User Manual 07/2017 Edition 55 Hilfe (Hel p) Opens the online help system. Messung wiederholen (Repeat measurem ent) Repeats the curre nt measurement i n the selected mode. Another placement op eration…
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The PDF evaluation (see section 4.2.5.3) outputs data on segments and overall values for the Twin
Head.
NOTICE
In rare cases (pickup errors and thereafter recovery placement), individual segment
assignments might not be correct. If it is necessary to know the segment assignments
when analyzing the measurement results, the placement has to be repeated until the
segment assignments are correct.
The results displayed in the Statistics area and the graphical view of the measurement results
match the selected head and the selected segment.
Mittelwert (Average (calculated average, offset))
The average calculated here relates to the segments activated in the segment selection. This is the
calculated average, i.e. the sum of all measured values / number of values.
Median (central value)
The median relates to the segments activated in the segment selection, too. This is the "middle
one" of the measuring values. To determine the median, all measuring values are arranged
according to size. The measuring value in the middle of the list of all measuring values then shows
the median (by 5 measuring values this is the 3rd value).If there is an even number of
measurement values, the median is defined to be the arithmetic mean of the two middle values (by
4 measuring values (x2 + x3) / 2). The median is inured to so-called runaway values, because
these will be sorted at the beginning or the end of the list of measuring values.
Standardabweichung (Standard deviation)
The standard deviation calculated here relates to the segments activated in the segment selection.
The standard deviation is displayed as 4
σ
.
Korrektur (Correction)
The offset data can be automatically transferred to the appropriate machine data file on the station
(see section 4.2.5.2).
Anzahl Messwerte (Number of measured)
Displays the total number of measurements.
Messfehler (Measuring error)
Displays the number of measurement errors per measurement.The user decides whether the
number of errors is too high and whether to repeat the measurement process.
► Check the measuring plate before you repeat the measurement. Possibly the foil was not
applied to the plate without air bubbles or the surface is scratched or dirty if the plate has been
used several times.
Bericht speichern (Save report)
See section 4.2.5.3.
Offset übernehmen (Accept offset)
The values that are marked under Correction are corrected in the machine data (see section
4.2.5.2).
Abbruch (Cancel)
The measurement is terminated and the board is moved out of the conveyor. You can remove the
ACT plate.
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Hilfe (Help)
Opens the online help system.
Messung wiederholen (Repeat measurement)
Repeats the current measurement in the selected mode. Another placement operation will not be
performed.
NOTICE
You can only save one measurement. Even if the measurement is repeated, only the last
log will be saved!
Evaluation of the Measurement Results
As described above, the standard deviation is displayed as 4
σ
.
NOTICE
The specification has been achieved if the sum of 4
σ
standard deviation and average is
smaller or equal to the limit to be achieved.
Example X-series with C&P12 head:
Specification = 60µm / 4σ
=> If the measured standard deviation is 54µm the offset (average) must not be more than 6µm.
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4.2.5.2 Correcting the Measured Offset Values with Station Software 605.xx
When the measurement is terminated you can enter the Offset (average) manually in the FK_Off
machine file FK_Off.MA.
It follows an example of entering the offset (average).
The results of the ACT measurement are displayed on the GUI. Among others, the offset (average)
in X, Y and Phi is filled.
Abbildung 4-34: Beispiel Offset (Mittelwert) eines TH, davon Segment 1 angezeigt
► Activate the check boxes for the axes for which you will correct the average.
► Click on the Offset übernehmen (Accept offset) button.
► Then finish the ACT function and shut down the machine.
After having rebooted the machine, you can restart the ACT function and repeat placement
measurements.
NOTICE
The new offset values are not regarded until the computer has been rebooted!