Feasa 20-F, User Manual

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FEASA LED ANALYSER
FUNCTIONAL VERSION
Get Data Mode
getCIEXYZ## - Return the CIE 1931 XYZ Colour values
Transmit Receive
getCIEXYZ@@ 0.0000e+00 0.0000e+00 0.0000e+00
Where:
@@ represents the Fiber Number and is a number in the range 01 – 20.
all represents the 20 Fibers in a Feasa 20F, or 3 Fibers in a 3F.
0.0000e+00 represents the X value
0.0000e+00 represents the Y value (Absolute Intensity *)
0.0000e+00 represents the Z value
Description
This Led Analyser is capable of measuring the CIE 1931 XYZ components. The Y component
is the photometric magnitude corresponding to the brightness of the source and
corresponds to
the photometric quantity that was used to calibrate the LED Analyser.
When the Feasa Spectrometer and:
- the Integrating Sphere (SPxx) was used then the Photometric Quantity is - Luminous flux (in lm)
- or the Millicandela Head (CDxx) was used then the Photometric Quantity is - Luminous intensity (in cd)
- or the Luminance Head (LUxx) was used then the Photometric Quantity is - Luminance (in cd/m^2)
This can also be referred to as the Absolute Intensity. The command getCIEXYZ@@ is used to
return the CIE XYZ Colour value for the LED under the Fiber number @@ after a Capture.
To achieve the XYZ values from the Led Analyser there are a couple of steps to follow:
*
Calibrate each Channel/Fiber of the Led Analyser for Absolute Intensity .
* When Calibration is complete, do a Capture to ensure valid Data is stored in the
memory of the LED Analyser
* The data for each LED can be read out one-at-the-time, in any order using the
command
getciexyz@@ . Note: it is important for the PC to use 01, 02, 03, etc to
indicate Fibers 1, 2 and 3, etc.
Example:
The PC transmits getciexyz01 to the LED Analyser to instruct it to send the stored CIEXYZ
Colour data for the LED positioned under Fiber No 1. The LED Analyser will return a string in
the format
0.0000e+00 0.0000e+00 0.0000e+00 to the PC.
getciexyz01
1.2345e+04 9.8765e-01 5.6789e+03
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