TPA Testing





If the sample has no Fracture peak then a pop-up box will appear stating Peak Not Found.  Click on OK to continue.  The three force peaks are found in REVERSE order (see graph above) so that a missing fracture peak will still produce the correct values for other results.  If the force peaks appear towards the end of the graph, failure to notice this is most likely to cause all TPA values to be incorrectly calculated.  In this case, try selecting a larger Force Threshold in your Graph Preferences.

After the peaks of the curve are detected the macro then instructs the cursor to search forwards and drop 6 anchors, in order, onto the curve (as shown above).  If the message, e.g. 'Unable to place cursor at specified position' is displayed then it is likely that the Distance Threshold is too high.  Again failure to notice this is most likely to cause most of the TPA values to be incorrectly calculated.  In this case try selecting a lower Distance Threshold in your Graph Preferences.

If the sample has no adhesiveness properties at all then force might not return to zero between the two compression strokes.  If this is the case then the anchors will not be positioned correctly.  To correct this problem, you might need to adjust the Go To Force value in the macro from 0.0 to something greater than the Texture Analyser trigger force.  The Adhesiveness result will then show a positive value, which should be ignored.

TPA.RSL: this is the results file that has formulas programmed in to calculate the TPA data from the measurements.  Unless this particular results spreadsheet is open when the TPA Macro is run the TPA parameters will not be calculated in the spreadsheet columns as expected.


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