Fluke 830 - Figure 7-8. Distance Marking on the Sensor

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Entering negative dimensions
In certain circumstances or unusual machine congurations, negative dimensions
may also be entered where needed, such as coupling center to front foot (right
machine) when this foot is behind the coupling center, or sensor to coupling
center if the sensor is mounted on the coupling such that the sensor distance
marking is in front of the coupling as shown in Figure 7-8. In the conguration,
the dimension sensor to coupling center has a negative value.
Figure 7-8. Distance marking on the sensor
Horizontal shaft alignment
Entering negative dimensions