Calibration: X-Rite sensitometers are calibrated using exposure setting #3 at the factory. The exposed density of Step #11 is adjusted to match factory standard instruments maintained by X-Rite. Process optimization sensitometers also have a table of relative log exposures values characterized by correlation to a master sensitometer. Because calibration requires a master instrument for comparison, sensitometers do not have user accessible calibration adjustments. X-Rite offers a recertification program to verify sensitometer calibration. Recertification is recommended every 24 months and can be arranged through X-Rite's Instrument Services Department.
Selecting Exposure Color: The film manufacturer will recommend the proper color light to expose the film. Select the same color as emitted from the intensifying screen. When using blue emitting intensifying screen-- use the "BLUE" position. When using green emitting intensifying screen--use "GREEN".
Adjusting Exposure Setting: The sensitometer has the capability of seven different exposure times for Green film only. The factory preset exposure setting is #3. If different exposure times are required, refer to the chart below. Each exposure setting will move the speed index on the film approximately one step. The DIP switch used to change the exposure time is located on the bottom of the unit.