User's Manual

400 B/W Reflection Densitometer
2-22-2
Descriptions of Available Responses
There are two basic versions of the 400, the 400B and the 400R. The
400B allows B-Response. The 400R allows R-Response.
B –X-Rite “Orthochromatic” Response This response is blue-green
sensitive with insensitivity to red light, making it ideal for use in
analyzing color prints for exposure to orthochromatic film. This is also
the response generally used for typesetting and B/W printing
operations.
R –X-Rite “Red” Response This response has a narrow bandwidth
with a peak wavelength of approximately 620nm. This response is
ideally suited for use with red laser flatbed scanners.
There is separate memory to store calibration for both responses. If you
change optics, recalibration must be performed using that response.
Once you have calibrated to both responses, you do not have to
recalibrate when changing optics.
OVERVIEW OF CALIBRATION PROCEDURES
Calibrating your instrument is crucial to maintaining its measurement
stability. It is also important to maintaining measurement agreement
between several densitometers at the same site; and making all
densitometers calibrate precisely to the same standard reference. Your
400 instrument allows you to use two different calibrations procedures
to address these factors:
1. Long Calibration will be used before you take your first
measurements for each response. After this calibration procedure
has been performed, you can use Quick-Cal™ (see below) to
quickly re-calibrate when necessary.
2. Quick Cal™ allows you to quickly re-calibrate to white without
having to re-measure the black.