18
Manual TECHKON SpectroDens
Menu: Calibration
Prior to every series of measurements a calibration should be carried out. After a cali-
bration the device is long term stable, however it is recommended to perform a cali-
bration before starting a new measurement task just to be sure the device is working
properly.
For density measurements the calibration is carried out on paper white. This will en-
sure that the density values are in direct ratio to the ink thickness which is applied
on the paper. When there is a change in the paper type, a new calibration has to be
done. Only in a few cases density measurements are referenced to an absolute white
standard.
A calibration is as easy to carry out as a measurement: Select the “soft key”
Calibration
and place the device with the measurement head on top of a blank area of the paper
sheet. The calibration can be started now by pressing either the enter button or the
green measurement button.
After one second there will appear a window with the message that the calibration
has been done. The device is now ready for measurements. The message window will
disappear with the next measurement.
During the calibration process always take care that the instrument is on a flat, stable
surface and that the material backing the paper is the same as for the following mea-
surements (white, gray or black). When the paper sample is printed on both sides, it
is recommended to use a black backing material in order to avoid mismeasurements
due to color shining through the back of the opaque paper.
