OMP40-2 installation guide
2.4
OMP40-2 basics
Enhanced trigger filter
Probes subjected to high levels of vibration or
shock loads may output probe trigger signals
without having contacted any surface. The
enhanced trigger filter improves the probe’s
resistance to these effects.
When the filter is enabled, a constant nominal
10 ms delay is introduced to the probe output.
It may be necessary to reduce the probe
approach speed to allow for the increased stylus
overtravel during the extended time delay.
Factory set to OFF.
Optical transmission method
Probes subjected to particular forms of light
interference may accept spurious start signals.
The OMP40-2 can be operated in either ‘Legacy’
or ‘Modulated’ optical transmission mode.
Legacy mode
A start filter improves the probe’s resistance to
these effects.
When ‘Legacy’ (start filter on) is enabled, an
additional one second delay is introduced to the
probe activation (switch on) time.
It may be necessary to revise the probe program
software to allow for the increased activation time.
Modulated mode
The OMP40-2 becomes compatible for use with
the OMM-2 with OSI / OMI-2 / OMI-2T / OMI-2H
to provide substantially increased resistance to
light interference.
Modulated transmission in the OMP40-2, is
capable of providing three different coded start
signals. This allows the use of two probes with an
OMI-2T and up to three probes with an OMM-2 /
OSI system respectively.
Twin / multiple probe system
To operate in a twin or multiple probe system, one
probe needs to be set to PROBE 1 start and the
other probe needs to be set to PROBE 2 start
(OMI-2T or OMM-2 with OSI) or PROBE 3 start
(OMM-2 with OSI only). These settings are user
configurable.
In a twin probe system, such as a spindle probe
and an optical tool setting probe, the spindle
probe needs to be set to PROBE 1 start and the
tool setter to PROBE 2 start.
In a multiple probe system, with two spindle
probes and one optical tool setting probe, the two
spindle probes need to be set to PROBE 1 and
PROBE 2 start, respectively, and the tool setter
needs be set to PROBE 3 start.
Optical power
Where the separation between the OMP40-2
and the OMM-2 with OSI / OMI-2 / OMI-2T /
OMI-2H / OMM with MI 12 is small, low optical
power may be used. In this setting, the optical
transmission range will be reduced, as shown on
the performance envelopes, so that battery life will
be extended.
Dotted lines on the performance envelopes
represent the OMP40-2 in low optical power.
Low optical power should be used whenever
possible for increased battery life.
Maximum battery life is achieved when lithium-
thionyl chloride (LTC) batteries are used in
conjunction with low power mode.
The probe is factory set to standard optical power.
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