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6.3.3.5 Tolerance band for evaluation elements
You can use the tolerance band for graphical evaluation elements to configure an additional hysteresis
region at the boundaries of the element, so for instance at the entry and exit side of a window. In this
hysteresis band, the measurement curve can cross back and forth across the boundary line of the
graphical evaluation element any number of times without resulting in an NOK evaluation. For example, if
a machine exhibits unwanted mechanical behaviour such as vibrations, or slip-stick phenomena arise in a
hydraulic system, then this will intermittently result in fluctuations or outliers in the recorded measurement
curve. If these fluctuations occur at the boundaries of an evaluation window, the DIGIFORCE
®
9311 will
evaluate the measurement as NOK if it detects that the curve repeatedly enters and exits the window. By
setting a tolerance band, however, the DIGIFORCE
®
9311 will give an OK evaluation provided the curve
fluctuation lies within this hysteresis band.
Diagram 55: Tolerance band
Note:
The Tolerance band X and Y parameters apply to all the graphical evaluation elements. They
cannot be defined for just one specific graphical evaluation element.
Note that when a tolerance band is enabled (Tolerance band X or Y > 0), the measurement
curve must pass through the area of the graphical evaluation element plus the tolerance value.
1
In measurement mode, tap anywhere on the touchscreen. The icon appears in the
bottom-right corner.
2
Tap to open the "Configuration Main Menu".
3
Tap the "Program Setup" icon.
4
Tap the "Evaluation" icon.
5
Tap the "Tol Band" icon.
6
Tap "Tolerance band X" and enter the value you require via the keypad.
7
Tap "Tolerance band Y" and enter the value you require via the keypad.
8
Tap to return to the "Select evaluation elements" menu.
Summary of Contents for DIGIFORCE 9311
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