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CLM-194 

User Guide

 

 

 

EOPTIS SRL 

Via Alto Adige, 152 – 38121 Trento (TN) – ITALY  
Tel.: +39 0461 260 552 – Fax: +39 0461 260 617 
www.eoptis.com – [email protected] 

Page 15 of 29 

CLM-194 

Rev. 1.05 - 06/2014 

Copyright © 2013-2014 EOPTIS SRL 

 

 

5.3.1

 

H

OW TO 

P

ERFORM A 

C

OLOUR 

D

IFFERENCE 

C

HECK 

A

NALYSIS

 

1.

 

Select the Colour Difference Check function from the Operating Mode selector 

2.

 

Set the Acceptance Thresholds  

3.

 

Acquire  a  desired 

Reference

  sample.  Either  select  an  existing  sample  from  the 

References

  list  or  let  the 

software detect the closest to 

Measure

, belonging to the selected group of the 

Reference

 list.  

4.

 

Acquire  the  data  of  the 

Measure

  sample  under  evaluation.  If  acquisition  has  already  been  performed,  any 

colour in the 

Measure

 list can be selected by double-clicking on it. 

5.

 

The  software  performs  the  colour  difference  calculation  and  shows  the  results  of  acceptance  threshold 

validation and plots the (L*; a*; b*) 

Measure

 coordinates against the 

Reference

 ones. 

 

5.3.2

 

U

SING THE 

I

NTERFACE

 

 

 

The acquired colour is displayed on the monitor as a guide only. It is very likely that it will appear 
to  be  different  from  the  actual  colour  of  the  sample.  This  is  due  to  several  factors  (such  as  the 
ambient light, monitor calibration, gamma settings, …) which must be controlled and fine tuned in 
order to for the colours to match.  

The 

Reference

 can be selected in two different ways, using the 

Reference

 Mode selector ④.  

 

Manual mode. 

Manual mode is enabled by selecting the 

MANUAL

 option in the Reference Mode selector ④. 

In Manual mode, the user selects a colour from the 

Reference

 List by double-clicking on it, by dragging it to the 

Reference

  colour  display  area  ③,  or  by  acquiring  a  new 

Reference

  colour.  Manual  mode  allows  the  colour 

difference of the current 

Measure

 (either that just acquired or selected from the 

Measure

 list) to be evaluated 

with respect to a 

Reference

 which is fixed and does not change during operations. 

 

Automatic  mode 

In  automatic  mode  the  software  automatically  chooses  the 

Reference

  colour  selecting  the 

most similar (lower ΔE*

ab

) to the current 

Measure

. If the 

ALL

 option is selected in the 

Reference

 Mode selector 

④,  the  colour  will  be  chosen  among  all  colors  in  the 

Reference

  list.  If  the  corresponding  group  name  is 

selected,  a  colour  group  will  be  chosen.  Automatic  mode  allows  the  user  to  highly  speed  up  the  Colour 
Difference Check when a large set of  samples comprised of a subset of various colours is to be checked. The 
user  does  not  need  to  select  the  right 

Reference

  when  a  new  sample  is  being  acquired  since  the  software 

automatically detects it. The automatic selection process is effective even on very similar colors if a group of 

Reference

  colours  to  be  selected  is  specifically  built  and  the  ΔE*

ab

  difference  between  these  colors  is  larger 

than the highest Acceptance Threshold. 
 

The software displays the colour difference between 

Measure

 and 

Reference

 in terms of CIE 1976 a,b (CIELAB) ΔE*

ab

 

colour difference ⑤. The CIELAB lightness difference ΔL*, CIELAB chroma difference ΔC*

ab

 , Δa* and Δb* difference 

are also provided ⑥. 
 

Δ  

ab

 

√(

L

 

 

 

L

 

 

)

 

  (

a

 

 

 

a

 

 

)

 

  (

b

 

 

 

b

 

 

)

 

 

 
Δ  

ab

 

√(   

 

)

 

  (   

 

)

 

  √(   

 

)

 

  (   

 

)

 

 

 
ΔL  L 

 

 

 

 

Δa  a 

 

 

 

  ;  

Δb  b 

 

 

 

 

 
being (L*

1

; a*

1

; b*

1

) the 

Measure

 coordinates and (L*

0

; a*

0

; b*

0

) the 

Reference

 coordinates. 

 

The colour difference ΔE*

ab

 is then compared to the user-defined Acceptance Thresholds ⑦ and if the corresponding 

threshold  is  not  exceeded,  the 

Measure

  is  ranked  to  one  of  the  three  acceptance  classes  (1,  2,  3).  If  the  largest 

threshold is exceeded, the 

Measure

 is ranked to the "void" (x) class.  

 

Summary of Contents for CLM-194

Page 1: ...CLM 194 Digital handheld colorimeter User Guide Rev 1 05 06 2014...

Page 2: ...products can reasonably be expected to result in personal injury Eoptis customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Eop...

Page 3: ...sition 13 5 3 Colour Difference Check 14 5 3 1 How to Perform a Colour Difference Check Analysis 15 5 3 2 Using the Interface 15 5 4 Colour Matching 17 5 4 1 How to Perform a Colour Matching Analysis...

Page 4: ...using a standard PC or laptop with a Microsoft Windows operating system After having performed the measurement of the sample of interest the application software allows you to evaluate the colour diff...

Page 5: ...System parts Item Description 1 Measurement aperture with sealed glass window 2 Handle 3 Handle end with stand pad 4 Instrument label with serial number 5 Display panel 6 USB cable for power and data...

Page 6: ...nised by host PC M Green steady ON system in Measure mode alternative to Reference mode R Green steady ON system in Reference mode alternative to Measure mode ACQ Red steady ON colour acquisition in p...

Page 7: ...batch to batch comparison in production and quality acceptance assembly of multi component products using different materials printed materials and the graphic arts industry where a 45 c 0 is the con...

Page 8: ...strument optically averages the colour on the area corresponding to the measurement spot For longer range non uniformities it is recommended to average several measurements taken at different position...

Page 9: ...tions The file is not signed by Microsoft and the Operating System might prompt for approval to proceed It is necessary to grant the approval in order to successfully complete the installation The ins...

Page 10: ...4 User Guide EOPTIS SRL Via Alto Adige 152 38121 Trento TN ITALY Tel 39 0461 260 552 Fax 39 0461 260 617 www eoptis com info eoptis com Page 10 of 29 CLM 194 Rev 1 05 06 2014 Copyright 2013 2014 EOPTI...

Page 11: ...item for few seconds 5 1 MAIN CONTROLS This section describes the main controls of the user interface Main controls Item Description Item Description Main menu with toolbar Measure Reference control...

Page 12: ...tion Each acquisition can be either addressed as a Measure or a Reference depending on its expected usage Measure and Reference data are indeed handled in different ways depending on the selected oper...

Page 13: ...w the instructions in 7 1 5 Place the colorimeter s measurement aperture in perfect contact with the sample surface 6 Trigger the acquisition Hardware triggered acquisition Software triggered acquisit...

Page 14: ...tive elements The result can be used for the quality control of a product to evaluate the colour aging of an object and for many other applications Colour Difference Check interface Item Description C...

Page 15: ...ur display area or by acquiring a new Reference colour Manual mode allows the colour difference of the current Measure either that just acquired or selected from the Measure list to be evaluated with...

Page 16: ...The Chroma and Lightness plots show the Measure coordinates plotted against the Reference coordinates set at the origin of axes Also the three Acceptance Thresholds are displayed as boundaries in thes...

Page 17: ...select the colour that resembles the measured sample by simply checking a best candidate colour palette instead of looking up a large set of physical samples Colour Matching interface Item Description...

Page 18: ...lour of the sample This is due to several factors such as the ambient light monitor calibration gamma settings which must be controlled and fine tuned in order for the colours to match The Colour Matc...

Page 19: ...ples of the same set With this feature sorting and classification processes become much more reliable and accurate than visual inspection Colour Classification interface Item Description Colour Classi...

Page 20: ...es list The selection can be made by dragging the colours from the References list to one of the five sections in the Reference colour display area These colours will set the classes to which the meas...

Page 21: ...2014 Copyright 2013 2014 EOPTIS SRL 5 6 L A B CHART The L a b chart displays all the colours in the Measure list on a graphical representation of the CIELAB colour space This provides the user with vi...

Page 22: ...rmation related to the selected analysis feature 5 8 USER CALIBRATION Each colorimeter is supplied with its own white reference standard necessary to perform the user calibration The standard is manuf...

Page 23: ...load a previously saved database removing all current colours The Save database button allows ypu to save a database on the computer for future use Files can be saved in cdb proprietary in pdf and xml...

Page 24: ...ptions are available and can be selected in any SI SO combination The selected combination is automatically saved for future software sessions when it will be restored and used as default settings Ill...

Page 25: ...ement time 0 1 s with 5 s minimum recommended measurement interval Recommended warm up time 20 minutes Dimensions Approx 225 mm L x 84 mm H x 99 mm W excluding cable Weight Approx 710 g Interface USB...

Page 26: ...is com info eoptis com Page 26 of 29 CLM 194 Rev 1 05 06 2014 Copyright 2013 2014 EOPTIS SRL Data view Colour Data see available scales above Colour Difference Data see colour differences indexes abov...

Page 27: ...all drivers To check the Device Manager to confirm that installation was successful go to the Windows Start menu select Run and enter devmgmt msc You will find the LM 194 Colorimeter under the Ports C...

Page 28: ...r from shipment date Should a unit fail during this period Eoptis will at its option repair or replace the damaged unit Repaired or replaced units will be covered for the remainder of the original equ...

Page 29: ...description added Rev 0 11 09 2013 Advanced features added Rev 1 0 09 2013 Inital full release Rev 1 01 09 2013 Minor corrections Rev 1 02 12 2013 Setup procedure updated additional Illuminant and Ob...

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