4.5 CONFIGURATION OF TEST PARAMETERS
4.5.2 SHOW ALL PARAMETER SETTINGS
The information window shows details of the parameter settings.
The Test Definition Software Description
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Figure 17: Window showing all parameters of all settings.
The software sets most of the parameters automatically.
Operation functions
▲▼ vertical selection vertical selection
Use the CURSOR keys ▲▼ to select a set or a parameter.
►◄ spread out parameter set shrink parameter set Spread out the viewing of a parameter set with the CURSOR key ► and fold it up with the CURSOR key ◄.
S1 decrease pre-signals increase pre-signals
Presignals are measurements without mentioning the results to set ferromagnetic test samples in a defined magnetic condition. By this the test results become stabile and reliable. Increasing the number of pre-signals prolongs the test duration depending on the test frequency.
Additional to the adjustable parameters explained before, the window shows following parameters:
presignals see above
The Test Definition Software Description
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averaging
Due to averaging the test results become more stable and the signal/noise ratio becomes better.
coil current
This value shows the maximum coil current (at 0 dB attenuation) as per mil of the maximum current of the device (2 ampere).
The actual current results from the indicated value divided by 1000, divided by the factor of the parameter “attenuation” multiplied by 2 A.
Example:
indicated value: 250 attenuation: 6 dB = 2
250 / 1000 / 2 * 2 A = 0.25 A
Calibration Software Description
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4.6 CALIBRATION
Calibration is the definition of the thresholds by calculating the dispersion and the position of the values of the test samples in good condition.
The calibration function is available in the laboratory operation mode as well as in the series operation mode.
Opening an existing calibration deletes all test data.
For calibration between 5 and 30 calibration samples per test class have to be tested. If several test classes have been established, these must be clearly distinguishable from each other. The higher the distance of groups towards each other in relation to the own size, the better is the ability of sorting and the safety of test.
The calibration window is closed with ESCAPE.
The switching from the calibration to the testing mode, depending on the configuration of the software, also can perform automatically!
The software changes to the start image. When in laboratory operation mode a test class without calibration values exists, the system asks for deleting it.
Figure 18: Inquiry, if the empty test class should be deleted
When confirming with ENTER the test class mentioned at the end of the message is deleted. With the ESCAPE key the message is deleted, the test class keeps remaining.
The main differences in operation of the calibration function between the laboratory mode and the series mode are:
Laboratory mode
1. Start the calibration with S1.
2. The calibration is stored in the test definition and is taken as basis for each test order based on this test definition. It is also possible to make settings in the calibration (test classes, size of test class, evaluation type) without picking
Calibration Software Description
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up calibration data. These settings are taken as default settings in the calibration in the series mode.
3. All adjustable parameters are enabled.
Series mode
1. If there is no or an incomplete calibration stored in the test definition, the calibration mode is starting when creating a test order. A calibration is complete when at least five test values are picked up for each test class.
2. The generation of a new test class is blocked. Only the test classes generated in the laboratory mode are available.
3. For adding values a calibration can be opened in series operation mode with S2.
4. A new calibration has to be done for each test order (compare on page 41 Series mode, item 2.).
5. If you reopen the calibration after picking up test data, the last 50 test values are displayed as “0”. The better orientation makes the adaptation of the test class easier (see below).
Figure 19: Display at changing calibration
Calibration Software Description
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If calibration is to be performed in series operation and if more than one test class is to be used, the test classes B, C, etc. are to be generated as empty classes in the laboratory mode!
When entering the calibration window for changing an already existing calibration all stored test data are deleted!
Up to four parameter sets are displayed parallel on the screen.
Figure 20: Calibration window (laboratory operation)
Elements of the calibration 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)
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The channel number displays the number of the multiplexer channel stored in the parameter list (see on page 35, “channel dec / inc”).
Current adjustment of the test frequency
128 Hz
The display of the parameters belonging to the window presents a better view and a help for a later selection of useful parameter sets.
Number of the evaluated harmonic
f1
Setting of the attenuation
2 dB
Factor for enlarging the represented cut-out of the measuring plane.
XX :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.
active test class
A
The MAGNATEST D 3.623 can distinguish up to six test classes.
x/y values of the last calibration value
x=nnnn
y=mmmm The current test values are only displayed in the single view mode.
Owing to the resolution of the analog-to-digital-converter of 14 Bit, the value range in x- and y-direction is ± 8192 points (comparison size without physical unit).
Amount of current calibration values in the actual test class / number of the actually selected calibration value.
#V/W
Up to thirty calibration values per test class can be recorded. The tolerance field (sorting limit) is calculated after reaching five calibration values and displayed.
busy lamp
The lamp is on for the duration of the test.
Calibration Software Description
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Icons of the calibration window:
S1 take measurement take measurement
Triggers the recording of a calibration value (manual trigger function). Execution is made irrespective of the direction of the rocker switch. Further trigger methods can be found in the chapter “Configuration Of Trigger Mode” on page 79.
S2 delete last value delete all values of current test class
This function serves to delete calibration data of the current test class (see function S4 “previous test class” on page 46). In order to delete a selected value see function S3 “select previous part” below.
Right key
Deletes all values of the current test class (A, B, C, ...) but not the test class itself.
After pressing the key, a query appears:
With the key ENTER the query is confirmed and all calibration values of the current test class are deleted. With ESCAPE the query is deleted, the calibration values are remaining.
Left key
Deletes the last value of the current test class (A, B, C, ...) or the one selected with S3.
S3 select previous part select next part
Makes it possible to select a calibration value in order to delete it with the key
< S2 . The selected value appears blinking. The number of the selected part is displayed at the left side of the display behind the number of parts of the actual test class.
Right key
Marks the next value resp. after the last one the first again.
Left key
Marks the previous value resp. the last after the first again.
Calibration Software Description
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S4 previous test class next test class
Switches between test classes resp. generates a new one (only in laboratory mode!).
The classes A to F can be generated for sorting. Class Y serves to store a reference part for later recalibration.
The current test class (A, B, ... F or Y) is displayed on the left side of the monitor.
Right key
The function changes to the next higher test class (e. g. A B). If the selected test class does not exist yet, a query will appear as to whether it is to be generated.
Confirm the inquiry with ENTER.
The new test class automatically gets the next free letter of the alphabet. The program will change into the new test class.
As a maximum, six test classes (A - F) can be generated for sorting.
Different test classes must be clearly distinguished. The bigger the distance is between the groups related to their own size, the better is the separation and the test security.
Left key
The next lower test class is selected (e. g. C B or A Y).
S5 previous class type next class type
Another evaluation form is allocated to the current test class. The parameter set to change therefore must exclusively be shown else an error message appears (see on page 50 “visualization screen”).
Calibration Software Description
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Four evaluation forms are available:
Circle
A circular tolerance field is drawn around the calibration values. The centre of the circle lies in the centre of gravity of the calibration values. The diameter is determined by the value being furthest away from the centre of gravity. The sorting limit is set to the triple distance of this value from the centre of gravity or to the value set with S6.
Ellipse
An elliptical tolerance field is drawn around the calibration values.
The calculation of the ellipse is performed on the basis of a two-dimensional normal distribution. For the field size no fixed probability is taken as a basis (no fixed sigma value); instead, the size of scattering is taken as the basis as in case of the evaluation form circle.
Box regression
This evaluation form consists of the evaluation form rectangle the limits of which are restricted by two parallel regression lines along the main distribution axis of calibration values.
The calculation of size is performed as following described for the rectangle.
This tolerance form is distinguished by its close adaptation to the calibration value distribution.
Rectangle
A rectangular tolerance field is put around the calibration values. The size, the position and the rotation are manually adjustable at the evaluation kind.
The centre of the rectangle lies in the centre of gravity of the calibration values.
The threshold in x and y direction is calculated by the calibration values been farthest away from the centre. As default it is laid on the triple distance of the minimum size.
After selecting the evaluation method „rectangle“ with the key S6 can be switched in an operation mode for editing the size, the position and the orientation.
Calibration Software Description
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Figure 21: Adaptation of the tolerance field
In the menu for the adaptation of the evaluation form rectangle recording of calibration values is not possible!
After a manual adaptation the tolerance field is not recalculated! By this calibration values also can lie outside the tolerance field. By changing the test class type or a new manual adaptation they can be included in the tolerance field.
Symbol Key Explanation
S1 Function for editing the width of the tolerance field.
S2 Function for editing the height of tolerance field.
S3 Function for the horizontal shifting of the tolerance field.
S4 Function for the vertical shifting of the tolerance field.
S5 Function for editing the orientation of the tolerance field by max. ± 45°.
ESCAPE With the ESCAPE key the operation returns to the calibration mode.
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S6 decrement test class size increment test class size The default value for the size of the tolerance field is 3.0. This function can only be used in single view mode.
If the evaluation method „rectangle“ is set, the operation and displaying of the window is like shown at the description of this function above!
Right key
Enlarges the current tolerance field step by step by 0.5 up to a maximum enlargement factor 25.
Left key
Reduces the current tolerance field step by step. The smallest adjustable size of the tolerance field is 1.0 (size where the tolerance field just encloses all values).
S7 show info show info
Pressing this key will open an info window in the foreground. The info window cannot be opened, if several parameter sets are displayed simultaneously. It always refers to the current test class.
Press S8 changes the view on the parameter sets.
Figure 22: Information window of the calibration mode
Besides the number of the current parameter set, the current test class, the size of the tolerance field and the number of calibration values the info window displays statistical information about the calibration values.
Calibration Software Description
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Close the window is with ESCAPE.
S8 previous visualization screen next visualization screen Shift function between the individual representations of parameter sets and view windows where up to four parameter sets are displayed in one window.
The functions "Class type", "Test class size" and “Show info” can only be executed in individual display of the parameter set to be changed.
A trial to edit these functions in the overview generates the following error message:
The operation of the functions "manual / automatic zoom" always refers to all visible view windows.
S9 zoom out zoom in
The function "manual zoom" enlarges or reduces the visible area of the calibration level. The measure for the current zoom adjustment is shown at the upper edge of the respective parameter window. The zoom covers the range from 1:1 to 2048:1.
The changing happens by factor 2.
The higher the adjusted zoom factor, the smaller the visible cut-out of the calibration level.
After execution of manual zoom the window is not automatically scaled anymore (the window is frozen). This means that calibration values that lie outside the visible area may not be displayed.
Calibration Software Description
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Should the area of the calibration 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 existing calibration 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.
Calibration Software Description
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