TP20moduleselection
To obtain the best possible performance from your PH20, it is important to select the correct probe module for
your specific application. When choosing the probe module to be used, the following considerations should be
addressed:
The mass of the stylus assembly and its centre of gravity. It is always best to use the shortest stylus
possible.
The orientation of the probe body.
The levels of acceleration and vibration to which the PH20 will be subjected. These will vary with each type
of CMM and movement velocity.
The following probe modules are available for use with the PH20; each probe module is clearly marked on its
front ring and also carries a colour-coded front cap as follows:
Low force probe module (green cap)
Standard force probe module (black cap)
Medium force probe module (grey cap)
6-way probe module (blue cap)
EM1 STD probe module (black cap)
EM2 STD probe module (black cap)
Thelowforceprobemodule
The low force probe module, identified by a green cap, is suited to applications that require a low trigger force,
for example rubber seals.
Thestandardforceprobemodules
The standard force probe modules (SF, EM1 STD and EM2 STD) are identified by black caps and are suited to
the majority of applications.
Themediumforceprobemodule
The medium force probe module, identified by a grey cap, is provided for use where a higher trigger force than
standard is required.
The6‐wayprobemodule
The 6-way probe module is identified by a blue cap. This probe module is designed for 6-way operation where
there is a requirement to measure in the –Z direction, for example when measuring undercuts.
NOTE: It is recommended that a standard force probe module is always used, except where the
application or machine acceleration or vibration would cause the TP20 to false trigger.
NOTE: The use of the extended force module is not recommended with the PH20 system
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