Recommended stylus limits
The figure below shows the two parameters of a stylus configuration which, when plotted onto the graph used to determine stylus limits,
determine whether or not the stylus is within the specified limits of operation. The stylus parameters shown below are the mass (M) and the
length (L) from the stylus mounting to the centre of gravity of the stylus.
Stylus limits
Graph to determine stylus limits
Trigger level
Under certain conditions, vibration may cause false ‘air' triggers during gauging and it may be necessary to reduce the probe sensitivity. False
triggers may occur when large or heavy stylus arrangements are used, or when there is floor transmission from nearby machinery or vehicles:
Trigger level 1 – the highest sensitivity mode, provides the best measuring accuracy
Trigger level 2 – lower sensitivity to vibration, but with a small loss of measuring accuracy
The trigger level is selected by switch number 9 on the rear panel of the PI 7-3 interface:
Level 1 – switch 9 to right
Level 2 – switch 9 to left
NOTE:
The sensitivity in probe damped mode is fixed and is not changed by the position of switch 9. The stylus tip(s) must be re-
qualified after changing the trigger level setting.
TP7 user's guide
www.renishaw.com
Issued 10 2019
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