2.5
OMP400 basics
Auto-reset facility
The Auto-reset function in the OMP400 compensates for stylus forces, due to high accelerations and
changes in probe orientation, that can cause the probe to trigger when using long styli (>100 mm).
This feature is suitable for radial rotations (e.g. vertical to horizontal). It is selectable using Trigger
Logic™.
NOTE: The Auto-reset function cannot compensate for rotations around the probe's axis when
horizontal with long styli (>100 mm). A manual reset will be required in this situation.
When a manual reset is required, the method used will depend on the probe's switch-off setting:
• In optical off mode, the probe must be switched off then on again.
• In timer off mode, the probe must be switched on using an M code start signal.
Optical transmission method and probe identity
The OMP400 can be operated in either legacy or modulated mode. The modulated mode has a
higher resistance to light interference. Certain forms of light interference can cause false triggers or
mimic a start signal and falsely activate the probe. These effects are much reduced when modulated
transmission is selected.
Legacy mode
When set to legacy mode, the probe will only function with an OMI or OMM / MI 12.
If start problems are experienced in legacy mode, activate the Legacy Start Filter ON option. This
introduces a 1 second delay to the probe switch on time, and improves the probe's resistance to false
starts caused by light interference.
NOTE: The probing program on the machine will need to take account of this delay.
Modulated mode
When set to modulated mode, the probe will only function with an OMI-2, OMI-2T OMI-2H or
OMI-2C interface.
For most applications, the spindle probe should be set to PROBE 1 start.
PROBE 2 start should only be selected for a secondary spindle probe in a twin probe application.
Optical power
Where the separation between the OMP400 and the receiver is small (no more than 2 m), the low
optical power setting may be selected. This setting reduces the optical transmission range and extends
battery life.
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