## Before You Begin

Exposure and Gray Sums During Calibration

Before you start calibrating your laser probe, be aware that PC-DMIS will automatically set the exposure to the default calibration value of 300 and the gray sums to the default calibration values of 10 for the minimum and 300 for the maximum. These values work best for most calibration scenarios. Your original exposure and gray sums values will be restored once the process finishes. While gray sums with values of 10, 300 are often appropriate for calibration, values of 30, 300 are typical for normal scanning.

Exposure for Rare Lighting Conditions

An exposure value of 300 is sometimes not sufficient in rare lighting conditions, such as V4i in a sodium lighting environment. If, due to such lighting conditions, it appears that PC-DMIS has trouble accepting the laser arcs during the calibration process, you may need to lower the default calibration exposure to a value close to 200. To do this, use the PC-DMIS Settings Editor, and modify the PerceptronDefaultCalibrationExposure registry entry, located under the NCSensorSettings group accordingly.

See the Laser documentation for information on exposure and gray sums.

Begin Calibration