Calibrating A Densitometer - Ricoh InfoPrint Pro C900AFP Manual

Calibrating a densitometer

The reflection densitometer must be calibrated to provide accurate density
readings. Before using, you must follow the instructions that are provided by the
manufacturer to calibrate the densitometer. The densitometer used must comply to
the spectral responses defined by ANSI PH2.18 - 1985 and ISO 5/3 - 1984. The
densitometer should not have a polarizing filter. The Greytag Macbeth model
D19C has a polarizing filter and should not be used. Densitometers which are
appropriate to use include the X-Rite Model 504, 508, or 400B.
The densitometer should be used in Absolute Density mode for measurements.
This procedure describes how to calibrate the X-RITE 400B (1060) densitometer,
using the Reflection Reference Card (part number 400-62). Since the X-RITE 400B is
now obsolete, this information is provided as reference.
The Reflection Reference is the card you use to calibrate the densitometer. You will
use only the circular patches labeled 1 (white reference) and 3 (black reference).
The densitometer should be calibrated periodically, or whenever the instrument
displays RECAL. You should store the Reflection Reference Card in its envelope.
1. Press the FUNCTION and ENTER keys in sequence, then release.
2. Press the ZERO key and release.
3. Press the FUNCTION key and release.
4. If X.XX matches the white patch ORTHO value for your reflection reference,
5. If Y.YY matches the black patch ORTHO value for your reflection reference,
6. When you see READ WHT displayed, center the circle on the base of the
7. When you see READ BLK displayed, center the circle on the base of the
After the version and copyright notices appear, the display will show N cal O
Y.
After the version and copyright notices appear, the display will show N qcal Y.
SET LO is displayed momentarily, followed by X.XX, where X.XX should be the
white patch ORTHO value from the Reflection Reference card.
press the ENTER key. If X.XX does not match, hold down the ZERO key and
press either the FUNCTION or the ENTER key. Decrease (FUNCTION) or
increase (ENTER) the value until the correct number is displayed. When
finished, release the keys and press Enter.
SET HI is displayed momentarily, followed by Y.YYH , where the Y.YY part of
the value should be the black patch ORTHO value from the Reflection
Reference card.
press the ENTER key. If Y.YY does not match, hold down the ZERO key and
press either the FUNCTION or the ENTER key. Decrease (FUNCTION) or
increase (ENTER) the value until the correct number is displayed. When
finished, release the keys and press Enter.
densitometer over the white patch (the one labeled "1") on the Reflection
Reference. Push the head down and then release it to establish the white patch
Optical Density.
If INVALID displays, repeat the measurement.
densitometer over the white patch (the one labeled "3") on the Reflection
Reference. Push the head down and then release it to establish the black patch
Optical Density.
If INVALID displays, repeat the measurement.
Chapter 29. Configuring the Halftone Management System
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