PLMNL0243 REV. A, Effective Date: 03/24/16
54
FiberMINI ™ 2.0 Operation Manual
Calculating the Standoff Error
A simple calculation can be used to generate a
standoff error signal that is assigned to the Drive
Command. See
. This allows the Z-
axis to track the surface of the part and maintain
a constant standoff value. Rung 4 takes the
Sense voltage, subtracts the desired standoff
value (V1401) and multiplies the result by a Gain
value (V1402). The final result is assigned to the
Drive Command.
Figure 67
Setting the Drive Command on
Tip-Touch
In some instances it may be desirable to have
the Drive Command revert to constant value
when Tip-Touch is active to move the Z-axis
away from the part. See
. In the
example shown in Rung 5, the value V1403 will
be sent to the Drive Command V1400. Typically
setting the Drive Command to 10V will move the
Z-axis up.
Figure 68