C3 difference measurement, Measure button: measure reference, Reference _ m mem – Hach-Lange SPECTRO COLOR d-8 User Manual

Page 17

BDA 387/2

Measuring Procedure
• Place spectro-color

in perpendicular

position to the sample.

• Press the measure key to trigger

measurement. Do not move spectro-color

as long as the display shows a clock.

• Measuring is signalled by a measuring start

and end beep.

• The display shows the values in the

selected colour system.

• Press key DIM to switch the next colour system.

C3 Difference

Measurement

Colour difference measurement determines the quantitative colour difference between a

reference and a sample in the three-dimensional colour space (CIE-L*a*b* or Hunter-Lab).

For this purpose, the colour difference is split up into lightness difference

ΔL*, red-green

difference

Δa* and yellow-blue difference Δb*. The overall spacial colour distance between

reference and sample is identified as

ΔE*.

Preparing the measurement
• Turn

spectro-color

on.

• Select your colour space (see B3.2).
• Press

key

ΔC for colour difference

measurement. The display reads:

If you have managed the internal memory for

reference colours with the PC-software

spectral-QC. The display reads:

The memory values can be loaded directly

by scanning the code with the barcode

reader. In this case the corresponding

reference name is displayed with the

reference values.

• To load a reference value from the memory

without the barcode reader, press key MEM

• The next measurement stores the colour

values of the reference.

C D65/10/SPIN

Wi Yi W (CIE)

Grf

DIM

Wi  =  34.5
Yi  =  15.2
Wb  =  36.0
CIE =  30.1
TPI =  59.8

Reference

_
M

Measure button:
Measure reference

Reference

_
M

MEM

Measure button:
Measure reference

MEM : Reference
taken from memory