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into device the, measurements can be executed without any further calibration.
A zeroing on the plate is however required for the “Visual Coverage” value.
This zeroing is done by a measurement on the medium (e.g. plate ground).
To check the absolute accuracy of the Ultra Dottie II, Beta Industries
offers the Ultra Dottie II Target. With the help of this tool, the device can be
checked and calibrated (see section 2.5.2).
3
3.5.3 Measuring standard plates
Standard plates and polyester plates are measured with a red
LED. Use of the blue LED or green LED is only recommended
when the color of the plate has a strong proportion of light pink hues (e.g.
AGFA N90A), as little image contrast is obtained
with red illumination.
3.5.4 Measuring polyester plates
Standard plates and polyester plates are measured with a red LED. Use
of the blue LED or green LED is only recommended when the coloring
of the plate has a strong proportion of light pink hues, as little image
contrast is obtained with red illumination.
Important:
Due to the grainy background of
polyester plates the repeatability may be
up to +/- 0.8 %. For the same reason and
because of the algorithms used for
measuring dots, measurements below 5%
or on a 100% patch can sometimes be
incorrect. Therefore, the measuring range
for exact readings is limited to 5% to 99%.
Please note that incorrect measurements
for 0% or 100% patches do not indicate
that the instrument is functioning poorly. If
you were to get incorrect measurements
for 0% or 100% patches, please use the
BetaTarget check the accuracy of the
device (see chapter 2.5.2).
Summary of Contents for Ultra Dottie II
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