There are the following tests for the bias sample:
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Long segment test
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Short segment test
To run the short segment test:
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If not already at the FAB user interface, start the FAB, open DB Admin, and click Use FAB. For more information, refer to Using the FAB.
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On the list on the left side of the page, click Bias - Short Segment.
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At Enter fabric width, type in the sample width. (The default is 5 cm.)
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Remove any sample fabric from the machine.
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Click Start. The movable clamp moves into place.
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Slide the narrow block (without grooves) between the clamps.
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Position the fabric sample on the FAB according to Positioning Fabric for Short Segment Tests.
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Remove the block.
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Click Start.
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Wait for step 2 to complete. This is indicated by a blue tick displaying at the step.
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Slide a pencil or a pen under the sample to very lightly create an upward arch.
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Click Start.
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Wait for step 3 to complete. This is indicated by a blue tick displaying at the step.
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Tap the length of a pen or pencil very lightly over the sample to create a downward arch.
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Click Start.
The test is complete when four blue ticks are displayed on the right side of the page.
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Depending on your version of DB Admin, do one of the following:
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If Calculate is displayed, click Calculate. A new page is displayed showing all calculated values.
Note
If Bend values are too low, an error message is displayed. To add the correct Bend values, do a manual Bend test.
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If Next is displayed, click Next. The calculated values display in the application after you click Finish.
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On the Results page, click:
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Export JSON to export the results in JSON format.
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Recalculate to recalculate the results.
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Save to save the data.
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