X-Rite 891, Operation Manual

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4-1
S E C T I O N F O U R
Establishing Reference
(AIM) Values
Proper handling of preprocess reference strips prior to establishing values is
essential to achieve accurate data. Refer to your strip manufacturer’s
documentation for proper handling procedures.
Reference strip values are used to establish “aim” points that all controls
strips are compared with. Any measured control strips that deviate from
predefined limits are instantaneously displayed, allowing corrective actions
to be taken.
Reference values are established by measuring preprocessed reference strips,
entering correction factor (if not preloaded), and performing strip crossover.
Depending on your process procedures, correction factors and strip
crossovers may not be required. Due to the variability of printer balance
strips, correction factors and strip crossover procedures are not available.
The 891/892 densitometer can automatically enter correction factors (ACF)
for a selected reference strip. This occurs if they are preloaded into the
instrument using Kodatel, etc. The instrument displays the proper correction
factors assigned to a strip batch code.
Aim value adjustments can also be performed on reference strips if required.
Section Four Contents
•
Reference Strip Measurement
•
AIM Value Adjustments
REFERENCE STRIP MEASUREMENT
Refer to your Control Strip and Balance Print Format Guide to located your
reference strip for proper insertion direction.
Each “film”, “pap”, and “pbM” channel stores one reference for its
respective strip type. Each “aux” channel (1-6) stores one film, paper, or
printer balance reference strip.
1. Press key llll (ref) located on Function Menu page (p4) to enter Select
Reference Channel screen.
NOTE: If the calibration procedure has not been performed for two weeks, a
Calibration Required message appears when key llll (ref) is pressed.