X-Rite 891, Operation Manual, Page: 23 / 80

2-1
S E C T I O N T W O
Instrument Calibration
This section covers the calibration procedures for your instrument.
Section Two Contents
•
Calibration Information
•
Auto Calibration Procedure
•
Manual Calibration Procedure
CALIBRATION INFORMATION
The instrument has two types of calibration procedures available, automatic
and manual. AUTO is the standard method of calibration. If you want your
instrument to measure the same as another densitometer that has the same
response, you would use the manual procedure. When the instrument
automatically calibrates, the density values are set precisely to that of the
paper measured for reflection, and to no film (air) for transmission.
The instrument has many self-checking algorithms built in to verify the
accuracy of calibration. If you wish to maintain accuracy verification, we
suggest that you obtain a C41 reference strip and a paper reference strip.
Measure each strip and record the density values. Place the strips in an
envelope and store them in a dry, cool environment. Periodically, measure
them to verify accuracy. Note, reference strips tend to drift in density with
time, consult the manufacturer's specifications for expected density changes.
If your Auto-Cal strip gets ruined or worn, you can order a replacement from
X-Rite or your local dealer. Order Part Number 880-100.
Frequency of Calibration
Under normal operating conditions, the instrument should be calibrated
once a week or when instrument displays a message regarding calibration.