Introduction; Device Description; Measuring Principle - ColorLite sph860 Bedienungsanleitung

Device description

2

Introduction

The colour of an object depends not only on its surface,
but also of the incident light. The sensation "colour" of an
object is dependent also on the observer. To determine a
colour difference between two objects, these must be
considered simultaneously under controlled lighting condi-
tions.
2.1 Device description
The spectrophotometer sph860/sph900 allows an objec-
tive determination of the colour difference between a
colour sample and a given color standard. The 45°/0°
measuring geometry - Measurement at 0°, circular illumi-
nation at 45° - corresponds to the DIN standard 5033.
The sph860/sph900 is equipped with a high resolution,
high contrast O-LED display. The external flexible probe
head has a small measuring spot and thus allows the
measurement of small or curved samples. The probe head
also implements a long-lasting and maintenance-free LED
light source. The measurement is trigged using either by
pressing the enter key or directly by pressing the probe
head onto the sample.
The true spectral scan provides excellent long-term repro-
ducibility.
Up to 1000 colour samples, plus 300 colours with spectral
remission data and 1000 colour standards can be stored in
the nonvolatile sph860/sph900 memory.
44
Downloaded from www.Manualslib.com manuals search engine
The data exchange with the optional ColorDaTra software
can be made using the integrated USB interface or via
Bluetooth.
2.2

Measuring principle

The spectrophotometer sph860/sph900 implements the
spectral method, which is the most accurate method of
measurement colours. The sample is illuminated with a
defined light source and the remitted light from the sur-
face is measured spectrally.
Since the surface colour depends on the illumination, the
reflected spectrum must be weighted with a standardised
source of light. The resulting spectrum is then evaluated
with the three spectra, which are based on the red, green
and blue sensitivity of the human visual system, and we
obtain the three values X, Y and Z.
As with the light source, the three sensory functions of the
human eye are standardised for a 2° and a 10° viewing
angle. This distinction is necessary since the colour sensa-
tion depends on the observation angle.
The measured colour values must always specify the
standard illumination and observation angle used. Since
colours are subjective variables, it is useful to convert the
base colour values (tristimulus values) X, Y and Z in other
colour scales, which are based on colour perception. This
means the colour difference value DE is more similar to
the perceived difference (more information on the theory
of colour measurement on the delivery is CD). There are a
Measuring principle
Sph860/900900 | ColorLite GmbH