Technical data

Appendices
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11
C 1 – 1.2.2
Appendix C
GretagMacbeth Reflection Densitometer Calibration to support ISO 9000
1 GretagMacbeth Density Calibration Reference
1.1 Expiration date
The expiration date of the density calibration reference is printed on the card.
The Density Calibration Reference has to be replaced after the expiration date.
1.2 Handling
Always keep your density calibration reference in its protective cover in a dry place.
Do not soil or scratch calibration elements
Clean the density calibration reference only with a soft cloth.
2 Calibration of GretagMacbeth Reflection Densitometers
GretagMacbeth reflection densitometers of the D190 series (D19C, D196, D118C) and of the D180
series (D181, D182, D183, D194, D15, D186) with monitor functions can be calibrated for absolute
white base or paper white base.
2.1 Calibration using paper white as white base
This is the preferred mode in the graphics industry.
Only those calibration values on the density calibration reference with “Paper“ designation
may be used.
All measurements are based on paper white.
The calibration should be checked once a month. The densitometer must be recalibrated
if necessary.
2.2 Calibration using absolute white as white base
Measurements against absolute white are used for applications that require absolute white as white
base e.g. in connection with the ANSI STATUS T reference and photofinishing or if there is no paper
white available.
Only those calibration values on the density calibration reference with “Absolute“ designation
may be used.
All measurements are based on absolute white.
The “white offset values“ (white) must also be entered during the calibration.
The calibration should be checked once a week or if the ambient temperature changes more then
10°C. The densitometer must be recalibrated if necessary.