Calibration:
SpectroPlate is factory-side calibrated. A white calibration
adjusts the digital camera module. The screen calibration is for
exact adjustment of dot percentage measurements towards
the reference plate Fogra Measuring Bar FMB. The calibration
remains permanentely and the devices are long-term stable.
This means that there are no time intervals for re-calibration
necessary.
To ensure the correct operation of the device, we recommend
to perform check-up measurements once a month. The suitable
reference for check-up measurements is the offset sample plate
Fogra Measuring Bar FMB from the research institute Foschungs-
gesellschaft Druck, fogra e.V., München. It includes a documen-
tation with a protocol listing reference values taken with a
laboratory instrument by the institute. Fogra Measuring Bar
can be ordered over the internet at www.fogra.org.
fogra Forschungsgesellschaft Druck e.V.
Streitfeldstr. 19 • D-81673 München/Germany
Telephone: +49 (0)89 43182-160
Telefax: +49 (0)89 43182-100
http://www.fogra.org
We recommend to make five measurements per measurement
patch and take the average value in order to level out measure-
ment deviations caused by inhomogeneous percentage patches
due to the production process of the FMB. The averaged measu-
rement results of SpectroPlate have to be within the following
tolerances:
AM screen (periodic): +- 0,5 %
FM screen (non periodic): +- 1 %
Place Date Signature
D-61462 Königstein
