4.5 CONFIGURATION OF TEST PARAMETERS
4.6.1 DEFINITION OF REFERENCE PART
Influenced by the environment, for example changes of temperature during series testing drifting of the values may happen. Due to warming or cooling the conductivity of the components of the test device as well as the testing parts is influenced.
As a result the loss can increase, because a rising number of good parts are falling outside close to the threshold. By using a reference part the shift of the test values in test mode can be compensated.
Record the reference part as following:
- Select test class Y with < S4 - Put reference part in test coil - Press S1 to pick up a value (Y)
- Switch back to the standard test class with S4 >
Figure 23: Definition of reference part Y
Test the reference part in the recalibration mode to correction the drift (ref. to
“Recalibration” at page 58).
Automatic test systems sort the reference part as bad part.
Testing Software Description
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4.7 TESTING
In the testing mode all icons have a green strip at their right side!
The testing function is available in the laboratory mode as well as in the series mode. The operation in both modes is identical but the following points:
Laboratory mode
- Pressing S2 starts testing.
- The test data are neither stored nor used for documentation.
Series mode
- If a basis calibration was performed in the test definition, the test mode will automatically start when generating a test order.
- Testing mode can also be started from the start image (series operation) with key S1 . If no valid calibration is available for the current test order, a respective error message will be displayed.
(ref. to “Generating A Test Order” at page 20)
- The last 5000 test values are stored in the data bank and they are available for further documentation.
- For each test order a protocol can be printed. A function for printing a protocol is located in the documentation window for the selection of a test order for displaying the histogram (see “Frequency Distribution Of Sorting Classes” on page 68).
For testing each part must be positioned in the test coil in the same way as in the calibration mode. If no other adjustments were made trigger the test with the S1 key. During the test the green control lamp on the left side at the bottom of the screen is switched on. It means that the device is busy. The test is finished when the symbol is disappeared, then the sample can be changed.
The sorting result is displayed on the screen and, if corresponding configurations of the sorting outputs were made, the output for the sorting gate is set.
Testing Software Description
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The test levels of maximal four parameter sets are represented in an automatically scaled manner. Switching to further sets is done with S8 .
The number of the actual test order is displayed behind the name of the test definition in the headline and in the info window. The number of the test order is automatically incremented. It is generated unique and not depending on the test definition.
Close the test window with ESCAPE.
The actual test order can be continued with the corresponding key after an interruption as long as it is active. The test order finishes when another one is created or the software changes into the laboratory operation mode.
Figure 24: Test window
Elements of the test window:
Number of the parameter set that is displayed in the current window
1.
Calibration values of up to four parameter sets can be displayed simultaneously.
channel number
(1)
The channel number displays the number of the multiplexer channel stored in the parameter list (see on page 35 “channel”).
Testing Software Description
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Current adjustment of the test parameter
128Hz - f1 - 2dB
The header line of every represented parameter set shows the actual setting of the parameters "frequency",
"evaluated harmonic" and “attenuation”.
Factor for enlarging the represented cut-out of the measuring plane.
64:1
The zoom factor informs you about the size of the visible cut-out in relation to the complete test range.
The higher the indicated factor, the smaller the cut-out of the measuring plane.
Sorting result of the last test part
A
Besides the unique allocation of a part in a class A - F a test value in different parameter sets may also fall into different classes. In this case, it is evaluated with X.
This means that the part cannot uniquely be allocated to one class. If one part is not inside one of the tolerance fields for at least one parameter set, it is sorted in class R (reject).
x/y values of the last test value. The analog values are only displayed, if one individual test class is represented on the monitor.
x = nnnn y = mmmm
Display for an over steering of the test device.
If voltage overflow at the receiving side occurs, the indication is set for five seconds. In this case the sample is sorted as bad.
The busy lamp is on for the duration of the test.
Icons of the testing mode:
S1 take measurement take measurement
Triggers a test value recording (manual trigger function). Performance is executed irrespectively of the direction of the rocker switch. The last established value is represented flashing. As a maximum, 200 test values are displayed.
S2 delete last measurement delete last measurement Deletes the last value.
Testing Software Description
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S3 recalibration testing
If no reference part was stored in the calibration changing to recalibration is not possible!
For further information see “Definition Of Reference Part” at page 52.
Left key
Changes in the recalibration mode (ref. to “Recalibration” on page 58).
The sorting indication left above shows Y.
Right key
Changes from the recalibration mode back into the testing mode. The sorting indication by this is deleted.
S7 show info show info
Press this key and an info window will be opened in the foreground.
Besides the name of the test definition and the test order, the date and time of test start, the number of defined parameter sets and the number of tested parts it also represents information about the distribution of test values in the sorting classes.
The window is closed with ESCAPE.
S8 next visualization screen previous visualization screen Switching function between the individual representations of parameter sets and the overview windows where up to four parameter sets per window are displayed.
Testing Software Description
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The operation of functions "manual / automatic zoom" always refers to every view windows!
S9 zoom out zoom in
The function "manual zoom" enlarges or reduces the visible area of the testing level. The measure for the current zoom adjustment is shown at the upper edge of the respective parameter window.
The higher the adjusted zoom factor, the smaller the visible cut-out of the testing level.
After execution of manual zoom the window is not automatically scaled. This means that test values that lie outside the visible area may not be displayed.
Should the area of the testing level to be enlarged move out of the window during enlargement, the display cut-out may be moved with the cursor keys.
S10 rescale rescale
The function "automatic zoom" scales all visible parameter windows to a size that all values are displayed. After adding new values, scaling is automatically calculated anew.
Automatic zoom will thaw the windows that have been frozen with the manual zoom.
Testing Software Description
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4.7.1 RECALIBRATION
During testing drifts can happen by variation of the ambient temperature. Due to this the results approach to threshold and they are going more and more to lie outside.
The recalibration function serves to correct this drift.
The calculation of the correcting factor is done by comparing the value of the reference piece in the recalibration mode with the one picked up in the reference mode (see to “Definition Of Reference Part” on page 52). The trend correction happens by adding the correction factor to the test values. In the test window the recalibration mode must be activated with < S3 . The sorting indication in this mode shows Y.
For recalibration the same sample that was used as reference part has to be tested.
Figure 25: Testing the reference part
The result is displayed as Y. With the cursor keys h fg d it can be shifted on the screen.
In automatic test systems the part is sorted as R (bad part).
The mode is finished by pressing S3 > . The program returns to the standard testing mode.
All following values are shifted by the calculated correction value (difference between the position of the reference part and the one of the recalibration part).
Testing Software Description
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To make sure that bad parts are still rejected after the recalibration some bad parts should be tested!
Documentation Software Description
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4.8 DOCUMENTATION
You can open the documentation level on the start page of the series mode with key S5 .
From here different kinds of reports can be selected.
Figure 26: Selection of documentation function
The window offers three evaluation types:
ESC Close window
The window is closed and the program changes in the starting image of the series mode.
S1 test results in tabular form test results in tabular form Tabular representation of individual values of last test
(ref. to “Tabular Representation Of Individual Values” on page 63)
Documentation Software Description
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S2 test classes in tabular form test classes in tabular form Tabular representation of test classes of last test (ref. to “Test Classes Of Individual Values” on page 66)
S3 histogram histogram
Graphical representation of test class distribution (histogram) (ref. to “Frequency Distribution Of Sorting Classes” on page 68)
S10 write test data to ASCII file write test data to ASCII file The function exports the data of the last test order into a text file in ASCII standard. From there the data can be processed with another software, e. g. with data visualization tools or spreadsheet software.
The text file consists of several columns separated by spaces. There number is determined by the number of used parameter sets. The first column is the number of the data (ten figures). Then the columns with the X / Y data (four figures plus sign) follow. At last the test classes are listed numeric coded. The codes have following meanings: 1 – A, 2 – B, … 6 – F, 7 – X, 8 – R.
Figure 27: Example for exported test data
The text file is always written in the folder C:\Projects\Data. Its name consists of the name of the test definition, the test order number and the actual test order
Documentation Software Description
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number (it differs if the test order number internally is incremented due to editing of the calibration).
Documentation Software Description
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