Evaluating The Control Chart; Crossover Procedure - Kodak Ektascan 2180 User Manual

User's Manual

Evaluating the Control Chart

[1] Differences of less than 0.15 should be considered to be normal process variations.
[2] Differences greater than 0.15 require immediate attention.
[3] Differences greater than 0.03 for Base+Fog require immediate attention.
[4] If any points on the control chart reach or exceed the limits, expose and process
another sensitometric strip for comparison. If the same results occur, determine and
correct the cause.
[5] A trend exists if a series of consecutive points (3 or more) progress steadily upward
or downward. Such a trend may be a shift taking place slowly and visibly with
respect to time. Monitor the Processor closely.
[6] Trends or gross fluctuations should be noted and evaluated. Take appropriate
action as necessary.
[7] Record the reasons for fluctuations, such as:
• routine preventive maintenance
• fresh chemicals
• developer starter added

Crossover Procedure

[1] Perform a crossover procedure when the new Kodak Ektascan HN Laser Film used
has an emulsion number different from that of the previously used "QC" film.
[2] On the same day, at the same time, expose the 21-step gray scale and process 5
films from the existing box of "QC" film and 5 films from the box with the new
emulsion number.
[3] Using the same gray scale step numbers, determine the average values for the 2
groups of film for:
• Speed Index
• Customer Upper Density Point
• Base+Fog
[4] Record the average values from the new box of "QC" film on the control chart.
[5] Record the new emulsion number.
16–10 5B9615