When PC-DMIS calibrates the vision probe in DCC mode, it uses existing measurement data or, if that is not available, the nominal values from the probe definition. PC-DMIS stores standard probe definitions in the probe.dat file, whereas machine specific probe definitions can be created in the usrprobe.dat file. Probe.dat files may be deleted or replaced during a PC-DMIS uninstall or version upgrade installation, but the usrprobe.dat file will not be deleted or replaced.
Since the positioning tolerances to have the tool in the field of view and in focus for high magnification systems can be very small, creating data in the usrprobe.dat provides a means for fine tuning the default probe attributes. Machine specific default tip offset values may be necessary to provide the more accurate nominal offset information.