5.After processing of film is complete, record the date, time, and processor identification number on the film in the designated areas.
Manual Data Recording
Procedure
Establishing Normal Speed Index, Contrast Index, and Base+Fog
The normal speed index, contrast index, and base+fog values are established on a representative film, when the processor is considered to be operating in an optimum fashion.
Run several film samples and determine the average values for speed index, contrast index, and base+fog, using a transmission densitometer. Step wedge areas are as uniform as is possible to produce. There are, however, some errors at the edges of the step area.
Therefore, always measure density at the center of the step. Use a 2mm aperture to give best repeatability.
Record the following data on the process control record.
•Developer Temperature - Temperature of developer solution in processor during processing
•Normal Base+Fog - Step number one density, the least exposed step on the wedge.
•Normal Speed Index - The density of the step closest to 1.0D + base+fog. The step number should remain the same for a given processor and film type.
•Normal Contrast Index - Select the step closest to but not larger than 2.20D. Subtract from this step the step closest to but not lower than 0.45D.
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