Rite Life 393, 394 manual Log E Curve, Selection and Use of Film

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Variations in processor conditions are monitored on this step.

•Contrast Index: An indicator of the slope of the straight-line portion of the D-Log E Curve is called Contrast Index. Select the step closest to but not larger than 2.20D. Subtract from this step the step closest to but not lower then 0.45D. Contrast Index is used to monitor processor variations in conjunction with the Speed Index.

FIGURE 1. D-Log E Curve

Optical density versus relative log exposure for typical radiographic film.

SPEED INDEX	CONTRAST INDEX
BASE+FOG

Selection and Use of Film

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Contents 393/394 Sensitometer Page FCC Proprietary Notice CE DeclarationIii Limited WarrantyTable Of Contents Unpacking and Inspection Getting StartedInstrument Description Applying Power Sensitometer Monitoring For Process Control Application and ProceduresSelection and Use of Film Log E CurveScheduling Sensitometric Control Processing ProcedureManual Data Recording Procedure Daily Plotting of Data on Process Control Record Developer Type Developer vendor identificationPrinting Process Control Records Automatic Data Recording Procedure-Using DensitometerSpeed Index Base+Fog Possible Cause Processor TroubleshootingSetting Exposure Color Using the SensitometerSelecting Single or Dual Exposure 394 only Adjusting Exposure SettingExposure Setting Exposing Film Important Notes Calibration/Recertification General MaintenanceRepair Information Cleaning the Step Tablet Cleaning the InstrumentGeneral Cleaning Replacing the Battery Weight Technical SpecificationsPage Page 393-500 Rev. O-4/28/04