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

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

Contents

393/394 Sensitometer Page FCC Proprietary Notice CE Declaration Iii Limited Warranty Table Of Contents Unpacking and Inspection Getting Started Instrument Description Applying Power Sensitometer Monitoring For Process Control Application and Procedures Selection and Use of Film Log E Curve Scheduling Sensitometric Control Processing Procedure Manual Data Recording Procedure Daily Plotting of Data on Process Control Record Developer Type Developer vendor identification Printing Process Control Records Automatic Data Recording Procedure-Using Densitometer Speed Index Base+Fog Possible Cause Processor Troubleshooting Setting Exposure Color Using the Sensitometer Selecting Single or Dual Exposure 394 only Adjusting Exposure Setting Exposure 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