operating manual
vates
colorimeter
Contents
1
2
3
4
5
Introduction.......................................................................................... 3
Command set description ................................................................... 9
1.1
Vates ........................................................................................... 3
5.1
Commands .................................................................................. 9
1.2
Highlights ..................................................................................... 3
5.2
Command structure ..................................................................... 9
1.3
Standards .................................................................................... 4
5.3
System commands .................................................................... 10
Interfaces............................................................................................. 4
5.4
Configuration commands .......................................................... 10
2.1
USB interface .............................................................................. 4
5.5
White point references .............................................................. 12
2.2
Ethernet ....................................................................................... 4
5.6
Measurement commands .......................................................... 12
2.3
RS232 interface .......................................................................... 4
5.7
User EEPROM commands ....................................................... 13
2.4
Trigger in/out ............................................................................... 5
5.8
Returned results ........................................................................ 15
2.5
Power connections ...................................................................... 6
6
Measurement example ...................................................................... 16
Communications protocol .................................................................... 7
7
Vates formulas .................................................................................. 17
3.1
USB ............................................................................................. 7
7.1
XYZ to Yxy conversion .............................................................. 17
3.2
Ethernet ....................................................................................... 7
7.2
XYZ to Lab conversion .............................................................. 17
3.3
RS232 ......................................................................................... 7
7.3
ΔE calculation............................................................................ 17
Device drivers...................................................................................... 8
4.1
USB ............................................................................................. 8
4.2
RS232 ......................................................................................... 8
2
8
Operating mode................................................................................. 18
9
Typical spectral sensitivity of Vates .................................................. 18
1 Introduction
1.1 Vates
1.2 Highlights
The Vates is the multi-talented member of the Admesy product family: It
offers the reflective surface measurement capabilities of the Arges with
0
0
45/0 geometry, combined with 20, 45 and 60 gloss and colour
measurement. Three stabilized light sources and four colour measurement
sensors at fixed angles contribute to an easy to use, low maintenance,
high end colour and gloss meter for applications in R&D and production
settings that demand specular component excluded (SCE) and separate
gloss measurements.



SCE colour measurements are carried out by illuminating surfaces and
measuring from different angles. This allows true colour measurement
excluding the influence of gloss. SCI typically measures colour by
illuminating and measuring at various angles to measure both colour and
gloss for total appearance measurement. Gloss is measured by
illuminating a sample from a predefined angle and measuring the light
reflected at the same but opposite angle.









3
0
Reflective colour measurement according to 45/0 standard
0
Gloss measurement at 20, 45 and 60
High speed measurement: 4000 colour or gloss
measurements/second in RAM mode
Measure colour and luminance in various colour spaces: XYZ,
CIELab, LCH, Luv
Measure deltaE according to CIE1976, CIE1994, CIE2000, CMC
Trigger input and output for in line applications. General Purpose
I/O for control
Measure via a PC (also embedded systems) or stand alone
Works on various operating systems: Windows, OSX, Linux,
winCE
SCPI command interface for easy integration in other applications
USBTMC standard compliant – full speed USB2.0 interface
Directly supported in Labview / Labwindows / Visual Studio via
VISA library. All other programming languages that support VISA
can be used
Suitable for contact and non-contact measurements
2 Interfaces
1.3 Standards
2.1 USB interface
The Vates colorimeter is compliant to the USBTMC standard and can be
used in combination with external provided USBTMC compliant drivers.
Currently it has been tested on Windows, Linux and Apple OSX using NI
VISA (www.ni.com/visa). On Linux our USBTMC devices work now directly
with a kernel >=2.6.28. This is Admesy's preferred driver structure for
Linux. Alternatively there's an open-source driver provided by Agilent
(www.home.agilent.com/upload/cmc_upload/All/usbtmc.html) on Linux
(i686, x86_64 and ARM). For installation instructions on the Agilent
USBTMC driver, refer to the Linux Brontes how-to on the Admesy web
site: (http://www.admesy.com).
The USB B connector is used to connect the Vates Colorimeter to a
PC/Laptop. The Vates Colorimeter complies to the USBTMC class
protocol and can therefore be used directly with third party provided VISA
compliant libraries like NI-VISA.
2.2 Ethernet
The Ethernet connector is used to connect the Vates Colorimeter to any
device that supports Ethernet. The Vates Colorimeter complies to the
IEEE 802.3 standard and can therefore be used directly with third party
provided VISA compliant libraries like NI-VISA.



Default IP: 192.168.0.50
Default GW: 192.168.0.1
Default MASK: 255.255.255
2.3 RS232 interface
RS232 is provided to connect the Arges 450 Colorimeter to any host that
doesn't provide USB or for which no USBTMC drivers exist. Using RS232
the high speed options of the colorimeter are still available, only transfer of
data to the host is reduced in speed. It is recommended to use USB in
case the high speed sampling options are needed.
Baud
rate
115200¹
Data bits
Parity
Stop bits
8
None
1
Flow
control
None
Termination
character
LF=’\n’
Table 1 RS 232 port configuration.
Note: The USB cable should not be connected together with the RS232 cable.
4
2.4 Trigger in/out
The Vates Colorimeter can be triggered when it's operating in USB,
Ethernet and RS232. When triggering is enabled, the trigger output line
will be set to a high level once the measurement has finished and the
measurement result is available. The trigger output will stay at a high value
for a minimum of 50µs in stand-alone mode. In USB and RS232 it will stay
at a high level until the next command is carried out. In USB, a trigger will
carry out the previously send command and send the result to the host via
an interrupt endpoint on the USB bus. The Colorimeter main application
allows external triggering in the data logging tab. Supplied code examples
show how to use this feature in an application. In RS232 mode, the trigger
output line is used to indicate that the measurement is ready. The trigger
input signal responds to a rising edge and should comply to the following
diagram.
Trigger pulses arriving faster than the Vates Colorimeter can measure will
be ignored, but it may slowdown overall performance. Trigger pulses
should not arrive faster than the measurement takes to complete.
Triggering via USB currently only supports the :MEASure/:SAMPle
commands. The output trigger is made zero before a command starts and
made high after the command finishes. The minimum pulse time is 50µs
for the trigger output.
𝑡 > 5𝜇𝑠
Manufacturer
Tyco electronics
Part number
1051638-1
Tyco electronics
1052063-1
Tyco electronics
1050721-1
Tyco electronics
1051140-1
Description
Straight
cable plug
Right angle
cable plug
Straight
cable plug
Right angle
cable plug
Table 2 Trigger connector manufacturer information.
Fig 2 Trigger-in timing.
5
Type
Solder
Solder
Clamp
Clamp
2.5 Power connections
The Vates Colorimeter should be connected to either powered USB, PoE
(Power-over-Ethernet) or using a 9V DC power supply. PoE module is
designed conforming the IEEE 802.3af PoE standard. The signature and
control circuit provides the PoE compatibility signature and power
classification required by the Power Sourcing Equipment (PSE) before
applying power to the port (Class 0: 0.44W – 12.95W). When using RS232
the Colorimeter needs to be powered via the external adapter. In case a
9V adapter is used, Admesy can only guarantee stable measurement
results and CE compliance when using the supplied adapter. The unit shall
be powered by a 9Vdc voltage or via a standard USB PC-port , reinforced
separated from Mains, with a limited energy of < 150VA and < 8A.
Power ratings
USB powered
DC powered
PoE powered
Min
voltage
4.75V
8.50V
36V
Typical
voltage
5.00V
9.00V
48V
Max
voltage
5.25V
9.50V
57V
Max
Current
450mA
450mA
450mA
Table 3 Power supply levels.
Fig 3 Power connection.
6
3 Communications protocol
3.1 USB
The Vates Colorimeter can be connected to any USB host that runs
Windows, Linux or Apple OSX. The Colorimeter is a USBTMC compliant
device. This makes the Vates Colorimeter directly usable in programming
languages like NI's Labview and Labwindows or any other language that
supports USBTMC. The Vates Colorimeter has two interfaces build in,
which require a different device driver to be used.

Vates Colorimeter
(USBTMC device driver , Vendor ID : 0x23CF, Product ID 0x0E99)
When the Vates Colorimeter is connected to the host, it will start the Vates
Colorimeter firmware, Green LED lights up. As soon as the firmware is idle
to receive commands, the Red LED lights up and the Green LED turns off.
The Vates Colorimeter is a USB 2.0 High and Full speed device.
3.2 Ethernet
Vates Colorimeter commands are equal for all interfaces.
3.3 RS232
Vates Colorimeter commands are equal for all interfaces.
7
4 Device drivers
4.1 USB
The following table shows an overview of USB support on various
operating systems.
OS
Windows XP
NI-VISA
2
Windows
VISTA
Windows 7
Windows 8(.1)
Windows 10
Windows CE
Apple
OSX
PPC
Apple
OSX
Intel
Linux
i386
(32bit)
Linux
i386
(64bit)
Linux ARM
Linux other
·
·
·
·
·
·
·
·
·
·
Not
available
Not
available
Libusb
·
·
·
Not tested¹
Not tested¹
Not tested¹
Not tested¹
Not tested¹
·
·
·
·
Native
kernel
Not
available
Not
available
Not
available
Not
available
Not
available
Not
available
Not
available
Not
available
·
·
·
·
Table 5 shows an overview of USB support on various operating systems.
Admesy supports all tested platforms but does not provide standard
applications on all platforms. The matrix is provided to show the possible
platforms for software development.
Agilent
USBTMC
Not tested¹
4.2 RS232
Not tested¹
When no USB driver is available or the host system does not provide
USB/Ethernet, RS232 can be used as it does not require additional drivers
for the Vates colorimeter.
Not tested¹
Not tested¹
Not tested¹
Not tested¹
Unknown
Unknown
·
·
·
·
Table 3 Supported operating systems.
1 Not tested: Available, but not tested by Admesy, 2 Native Kernel: Driver included with OS.
2 Windows XP SP3 is supported: Windows official support has ended as of April 8 2014
8
5 Command set description
5.1 Commands
The functions of the colorimeter can be best described via the following
categories:




Command table
:SENSe:GAIN auto
System commands
Configuration commands
Measurement commands
Trigger programming commands
:MEASure:XYZ
The Vates uses SCPI like commands for control and measurement. These
are ASCII based commands and follow specific rules regarding syntax.
Although the Arges colorimeter uses SCPI like commands, they deviate
from the SCPI standard.
:SAMPle:XYZ
5.2 Command structure
Every command starts with a colon “:”, which identifies the root of the
command tree. Each further keyword is also separated by a colon. In case
parameters need to be specified, the last keyword and parameters are
separated by a single space character. In case more than one parameter
needs to be specified, the parameters need to be separated by a comma.
Table 6 Example commands.
The command tables show commands in long and short format. The short
format is specified by upper case characters. It is allowed to use long and
short format or a mixed format. Optional keywords are shown between
brackets [...]. Commands are case insensitive, so it is allowed to use both
or a mix of upper and lower case. The command structure is valid for all
communication interfaces of the Vates.
9
Valid command
syntax examples
:sens:gain auto
:sense:gain auto
:SENS:gain auto
:SENSE:GAIN auto
:measure:XYZ
:measure:xyz
:meas:XYZ
:MEASure:XYZ
:sample:XYZ
:sample:xyz
:samp:XYZ
:SAMPle:XYZ
Notes
Sets the GAIN function
of the Vates
The measure
commands uses the
averaging and gain
options
With the SAMPLE
command, the Vates
will perform fast
sampling to internal
memory. Results are
read back from
memory after the
measurement has
been performed
5.3 System commands
5.4 Configuration commands
The following commands can be used to control the Vates or read back
information.
Configuration commands are used to set parameters of the Vates that are
used by the measurement functions. The settings are used globally by
other measurement functions. The selected white standard is used for
CIEL*a*b* and Lu'v' measurements. The gain setting can be varied over 8
stages. The largest gain factor is “1”. Results from the Vates include a clip
and noise indication which indicate whether the measured light is too
bright (clip) or too low (noise). When clipping is detected, the resulting
colour will not be correct and a higher gain value should be chosen. When
noise is detected, a lower gain value should be chosen. Note that when
measuring light from alternating sources, the lowest and highest peaks
detected during averaging determine the clip and noise indication levels.
See table 9.
Command syntax
:*CLS
:*IDN?
:*RST
:*STB?
Parameters
None
None
None
None
:*TST
:*FWD?
:*FWT?
:SYSTem:VERSion?
None
None
None
None
:SYSTem:ERRor?
None
:SYSTem:ERRor:NEXT?
None
Purpose
Clear status
Identification Query
Reset Command
Read Status Byte Query
(only USB)
Self-Test Query
Firmware date Query
Firmware time Query
Get system version
information
Retrieve the last occurred
error
Retrieve previous errors
Table 7 System commands.
The Status byte can be used to retrieve information about the status of a
command or the system. Return values of the status command can be
seen in the table below.
Code
0
1
2
4
8
Description
System is idle
Data is available
Command processed
Data in buffer (should not occur)
An error occurred. Use “:SYSTem:ERRor?”
to get the exact error that occurred
Table 8 Status commands.
10
Command syntax
:SENSe:GAIN
Parameters
Gain
:SENSe:GAIN?
None
:SENSe:AVERage
Averaging
(integer)
None
0 - 4000
String
“small”,
“wide”, “off”
:SENSe:AVERage
?
:SENSe:SBW
:SENSe:SBW?
None
:SENSe:ANGLE
Sensor
:SENSe:ANGLE?
Sensor
:SENSe:
LEDANGLE
:SENSe:
LEDANGLE?
:SENSe:REF
LED
:CONFigure:
WHITE
String
LED
Range
0–8
0 = auto
Purpose
Set Gain value
Returns the current
setting
Set Averaging value
Command syntax
:CONFigure:WHIT
E?
:CONFigure:WHIT
E:USE
Parameters
None
Range
Boolean
0 = No
1 = Yes
:CONFigure:WHIT
E:USE?
None
0–1
:CONFigure:MOD
E
:CONFigure:MOD
E?
:CONFigure:BAU
DRATE
Enum
(0,1,2,3)
none
USB,RS232,
Ethernet
0–3
Baud rate
0–5
(9600 230400)
:CONFigure:BAU
DRATE?
:CONFigure:TRIG
:CONFigure:TRIG
?
None
Query white reference
Query Averaging value
0–3
0
0
0
0 , 20 , 45 ,
0
60
0–3
0
0
0
0 , 20 , 45 ,
0
60
0–2
0
0
0
20 , 45 , 60
0–2
0
0
0
20 , 45 , 60
None
A, B, C, D40
D42, D50
D55, D65
D75, D90
D95, E, F2
F7, F11
Set calibration matrix
Query selected
calibration matrix
Set Sensor angle to
measure
Query Sensor angle to
measure
Set LED angle to
measure
Query LED angle to
measure
Measures white ref. Of
45/0 angle
Set reference white
value for Lab/Luv
colour space
Trigger
None
Table 9 Sense and configuration commands.
11
Purpose
Use the stored white
value for XYZ, Lab
and Luv calculation
and stand-alone
modes. This allows
relative measurements
Check if the stored
white value is being
used
Configure the Vates
mode
Returns the current
setting
Set RS232 baud rate
Returns the current
setting
0–1
Set trigger mode
Returns the current
setting
5.5 White point references
Reference white
A
B
C
D40
D42
D50
D55
D65
D75
D90
D95
E
F2
F7
F11
X
109.8405
99.0899
98.0708
99.6092
98.7058
96.3758
95.6559
95.0182
94.9524
95.2270
95.3315
100.0000
99.1869
95.0392
100.9631
5.6 Measurement commands
Y
100.0000
100.0000
100.0000
100.0000
100.0000
100.0000
100.0000
100.0000
100.0000
100.0000
100.0000
100.0000
100.0000
100.0000
100.0000
Z
35.5583
85.3242
118.1847
60.9432
65.4253
82.4087
92.0311
108.7485
122.5079
138.5514
142.9635
100.0000
67.3944
108.7460
64.3522
Command syntax
:MEASure:XYZ
:MEASure:Lab
Parameters
None
None
Range
Purpose
:MEASure:LEDXY
Z
:SAMPle:XYZ
Samples
1 – 4000
Measure XYZ
Measure CIE L a b
colour point (needs
reference to be set)
Measure LEDXYZ
Samples
Delay
Samples
Delay
Angle
1 – 4000
0 – 255
1 – 4000
0 – 255
0–4
:SAMPle:Lab
:MEASure:TEMPe
rature
:MEASure:LEDTE
MPerature
:MEASure:Gloss
0
0
Sample XYZ
Sample Lab
0
0 /20 /45 /60
Angle
Angle
0–2
0
Measure temperature
of the Sensor
20 /45 /60
Measure temperature
LED
0–2
Measure Gloss units
0
0
0
0
0
0
20 /45 /60
Table 11 Measurement commands.
Table 10 White point references.
Table 11 shows the measurement commands of the Vates colorimeter.
Regarding colour/luminance measurement there are two kind of
commands (MEASure/SAMPle). The MEASure commands measure the
requested values using the set averaging and gain and returns the result
in a single structure of three single precision floating point values.
Averaging can be set using the :SENSe:AVERage configure command.
The SAMPle commands measure the requested parameters using a
sample count and delay time and return an array of data. The array
contains single floating point data. Each sample count equals one
complete structure, for example one XYZ structure of data.
Note: The delay time is set in sample times, meaning a delay of one will skip one sample.
Note: When using high sample amount make sure timeout values in the application software
are set accordingly.
12
5.7 User EEPROM commands
The following commands can be used to store values in the user
EEPROM space. Note that they are not stored until a :EEPROM:WRITE
command is given. It is advised to reboot the Vates after writing new
values to the EEPROM.
Command syntax
:EEPROM:
STARTUP:READ
Parameters
None
:EEPROM:
STARTUP:WRITE
Vates mode
Amp factor
:EEPROM:
USERREF:READ
None
Range
0–4
0–8
:EEPROM:
USERREF:WRITE
:EEPROM:
WHITEREF:READ
LED
Angle
White
:EEPROM:
WHITEREF:
WRITE
LED
Angle
White
:EEPROM:GLOSS
STandard:READ
Angle
Gloss
0–2
0–3
0 = X, 1 = Y,
2=Z
0–2
0–3
0 = X, 1 = Y,
2=Z
0–3
0 = X, 1 = Y,
2=Z
Purpose
Copies start up
conditions from
EEPROM to internal
variables
Copies internal
variables to EEPROM
and sets mode and
amp factor
Copies the white
references, gloss
references and gloss
standards of all
sensors to internal
variables
Copies internal white
references, gloss
references and gloss
standards of all
sensors to the
EEPROM
Retrieves the
EEPROM white
references values
Sets the white
references values
Retrieves the
EEPROM gloss
standards values
13
:EEPROM:GLOSS
STandard:WRITE
Angle
Gloss
:EEPROM:
GLOSSREF:READ
Angle
Gloss
:EEPROM:
GLOSSREF:
WRITE
:FACTEEPROM:
REF:READ
Angle
Gloss
:FACTEEPROM:
WHITEREF:
READ
LED
Angle
White
:FACTEEPROM:
GLOSSSTandard:
READ
:FACTEEPROM:
GLOSSREF:
READ
:EEPROM:SENSe:
GAIN
:EEPROM:SENSe:
GAIN?
:EEPROM:SENSe:
AVERage
:EEPROM:SENSe:
AVERage?
Angle,
Gloss
:EEPROM:SENSe:
SBW
:EEPROM:SENSe:
SBW?
:SENSe:
SBW
:SENSe:
SBW?
0–3
0 = X, 1 = Y,
2=Z
0–3
0 = X, 1 = Y,
2=Z
0–3
0 = X, 1 = Y,
2=Z
None
Angle,
Gloss
Gain
0–2
0–3
0 = X, 1 = Y,
2=Z
0–3
0 = X, 1 = Y,
2=Z
0–3
0 = X, 1 = Y,
2=Z
0–8
0 = Auto
Retrieves the
EEPROM gloss
reference values
Sets the gloss
reference values
Copies the white
references, gloss
references and gloss
standards of all
sensors to internal
variables.
Retrieves the
EEPROM white
references values
Retrieves the
EEPROM gloss
standards values
Retrieves the
EEPROM gloss
reference values
Set the default gain
level
Retrieves the
EEPROM Gain value
None
Average
Sets the gloss
Standards values
0 – 4000
None
String
None
Set the default number
of samples to average
Retrieves the
EEPROM average
value
“small”, “wide”, “off”
:EEPROM:
CONFigure:MODE
Enum
(0,1,2,3)
:EEPROM:
CONFigure:
MODE?
:EEPROM:
CONFigure:
BAUDRATE
:EEPROM:
CONFigure:
BAUDRATE?
:EEPROM:
CONFigure:TRIG
:EEPROM:
CONFigure:TRIG?
None
:EEPROM:USE:
WHITE
Use white
:EEPROM:USE:
WHITE?
None
:EEPROM:
CONFigure:
WHITE
String
:EEPROM:
CONFigure:
WHITE?
:EEPROM:
CONFigure:IP
:EEPROM:
CONFigure:IP?
:EEPROM:
CONFigure:GW
None
Baud rate
USB
RS232
Ethernet
0–5
(9600 –
230400)
0–1
0 = No
1 = Yes
A, B, C, D40
D42, D50
D55, D65
D75, D90
D95, E, F2
F7, F11
Set the external trigger
mode (on/off)
Retrieves the set
values for the external
trigger mode
Use the stored white
value at start-up for
XYZ, Lab and Luv
calculation.
Retrieves if the stored
white value is being
used at start-up.
Set the default white
point reference. This is
only used for internal
colour space
conversions
x.x.x.x
Set the IP
Query the IP
x.x.x.x
Set the gateway
14
Query the gateway
None
String
x.x.x.x
Set the network Mask
None
Query the network
Mask
None
Query the MAC
address
Table 12 User EEPROM commands.
Retrieves the set
default white reference
None
String
Set the default RS232
baud rate of the device
Retrieves the default
value for RS232 baud
rate
None
String
:EEPROM:
CONFigure:GW?
:EEPROM:
CONFigure:
MASK
:EEPROM:
CONFigure:
MASK?
:EEPROM:
CONFigure:MAC?
Retrieves the default
operating mode
None
Trigger
Configure the Vates
mode
5.8 Returned results
:MEASure command return their result in ASCII formatted floating point as
shown below :
(X,Y,Z,clip,noise)
→
Sample X Y Z
dt
Clip
Noise
Value 1 (X)
Value 1 (Y)
Value 1 (Z)
Value n (n-1) (Y)
Value n (n) (Z)
%f,%f,%f,%d,%d\n
X,Y,Z can be substituted for L,a,b or other colour spaces. Exception to the
above is the :MEASure:TEMPerature command.
:MEASure:TEMPerature →
(MCU temperature, Sensor temperature,
LED PCB temperature, Control sensor temperature) → %f,%f,%f,%f\n
%f\n
%f\n
%f\n
%f\n
%f\n
%f\n
%f\n
%f\n
Table 13 Return result MEAS command.
:SAMPLe:Y command returns the result in “unsigned int 16” format. (Y in
counts)
Sample Y
dt
Clip
Noise
Value 1
Value 2
Value...
Value (n-1)
Value n
:SAMPle:XYZ, :SAMPLe:Yxy, :SAMPLe:Yuv, :SAMPLe:Lab and
:SAMPLe:Luv commands return their result in “32 bit single precision
floating-point” format when operating in USB Mode.
The first three values indicate the delta time between samples and the clip
and noise values.
%u\n
%u\n
%u\n
%u\n
%u\n
%u\n
%u\n
%u\n
Table 14 Return result MEAS command.
Note: When operating in RS232 mode the data of the :SAMPLe commands will be returned in
ASCII format. All data is separated using a TAB (\t) and the last value is terminated using an
end of line constant (\n).
15
6 Measurement example
open device
The Vates uses default settings when the device is started. These can be
programmed by the end user so that the device starts with the same
settings each time it is connected.
:sens:aver 500
Although it's possible to program all Vates devices in a production
environment to start with equal settings, it is recommended to set the
averaging, gain and SBW values in the initialization routine of the host
software.
Open device (VISA open, RS232 port init)
Set averaging to 500 sample
:sens:gain 1
Set gain to setting 1
:use:white 0
White reference is not used
A typical measurement example to measure XYZ would include the
following commands:
:meas:xyz
Measures CIE X, Y and Z, the result will be the
average of samples using gain 1 and in absolute
mode (no white reference)
read result
Read
the
result
back
from
device
(VISA/USBTMC read command or RS232 read)
Action may be performed in a loop
close device
Fig 4 Measurement example.
16
Close the device
7 Vates formulas
7.1 XYZ to Yxy conversion
7.3 ΔE calculation
The Vates colorimeter uses an XYZ sensor, meaning that other colour
spaces are being converted from XYZ. The following sections show the
mathematical conversions that are used by the colorimeter to perform
conversion from XYZ to other colour spaces.
Delta E within the Vates is calculated according to the CIE1976 standard.
Other formats are available through PC software. Where 𝐿1 𝑎1 𝑏1 is the
target colour and 𝐿2 𝑎2 𝑏2 is the new measured colour to compare to the
target. Note that for Lab measurements a reference white needs to be
chosen. Both the target colour and new measured colour should be
measured using the same chosen white point.
𝑋
(𝑋 + 𝑌 + 𝑍)
𝑌
𝑦=
(𝑋 + 𝑌 + 𝑍)
𝑍
𝑧=
=1−𝑥−𝑦
(𝑋 + 𝑌 + 𝑍)
𝑥=
𝛥𝐸 = √(𝐿1 − 𝐿2 )2 + (𝑎1 − 𝑎2 )2 + (𝑏1 − 𝑏2 )2
7.2 XYZ to Lab conversion
The Vates colorimeter measures in CIEL*a*b* colour space. For Lab
0
measurements a white reference needs to be set. By default the Arges 45
is set to D50.
𝑒 = 216⁄24389 , 𝑘 = 24389⁄27
𝑥𝑟 = 𝑋⁄𝑊ℎ𝑖𝑡𝑒𝑅𝑒𝑓𝑋 , 𝑦𝑟 = 𝑌⁄𝑊ℎ𝑖𝑡𝑒𝑅𝑒𝑓𝑌 , 𝑧𝑟 = 𝑍⁄𝑊ℎ𝑖𝑡𝑒𝑅𝑒𝑓𝑍
3
3
3
𝑦𝑟 > 𝑒
𝑥𝑟 > 𝑒
𝑧𝑟 > 𝑒
√𝑦𝑟
√𝑥𝑟
√𝑧𝑟
𝑓𝑥 = {(𝑘𝑥𝑟 + 16)
𝑓𝑦 = {(𝑘𝑦𝑟 + 16)
𝑓𝑧 = {(𝑘𝑧𝑟 + 16)
𝑥𝑟 ≤ 𝑒
𝑦𝑟 ≤ 𝑒
𝑧𝑟 ≤ 𝑒
116
116
116
𝐿 = (116f𝑥 ) − 16
𝑎 = 500(𝑓𝑥 − 𝑓𝑦 )
𝑏 = 200(𝑓𝑦 − 𝑓𝑧 )
17
8 Operating mode
9 Typical spectral sensitivity of Vates
Operation is possible as slave device for a host PC or as stand-alone
device. In slave mode the Vates colorimeter listens to commands send by
the host PC as mentioned in the previous paragraphs. The modes of the
Vates are:



USB mode
RS232 mode
Ethernet
In all modes, USB is still active but when only USB is used, it is
recommended to set it to USB mode so that the Vates responds in the
fastest possible way to commands. The operating mode must be selected
via the Vates PC application. All target values can be measured using the
configuration utility or input manually.
18
Admesy B.V.
Branskamp 5
6014 CB Ittervoort
The Netherlands
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19
12/2015
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