FEASA LED ANALYSER
FUNCTIONAL VERSION
Step-by-Step approach to Testing a LED
Standard Capture Mode
To Test the Colour and Intensity of up to 20 LEDs simultaneously carry out the following:
1. Ensure that the LEDs to be Tested are turned on and that the fibers are centered over
the LEDs.
2. To Test the Colour and Intensity in RGB first send the command capture to the LED
Analyser. The LED Analyser will return the characters OK indicating that the Colour and Intensity
data for the LEDs has been stored in the internal memory.
3. Transmit the command getrgbi01 to retrieve the results for Fiber 1. Any fiber can be
queried by sending the command getrgbixx to the LED Analyser, where xx is the fiber number in
the range 01 to 20. The LED Analyser will return the results in the format rrr ggg bbb iiiiiE
where rrr, ggg and bbb are the red, green and blue components of the light in decimal format
in the range 000 to 255. The iiiii value indicates the intensity value of the light in the range
00000 to 99,999.
4. Alternatively, the Led Analyser may also be queried to retrieve the Hue, Saturation and
Intensity results for the LEDs under test. After step 2 send the command gethsixx to the LED
Analyser where xx is the fiber number. The LED Analyser will return the results for that fiber in
the format hhh.hh sss iiiiiE where hhh.hh is the Hue, sss is the Saturation(whiteness) and iiiii
are the Intensity results for that Fiber.
5. An Intensity value of 0 will indicate that the LED under test is not bright enough. To
compensate for this move the fiber closer to the LED or increase the LED intensity. An Intensity
value of 99,999 will indicate that the LED is too bright and the LED Analyser has an over-range
condition. In this case increase the distance of the LED to the Fiber or decrease the LED Intensity.
6. In general, try to keep the Intensity less than 80,000 and greater than 20,000.
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