Feasa 20-F, User Manual

Page: 74 / 132

FEASA LED ANALYSER
FUNCTIONAL VERSION
User Calibration Mode
User Calibration for RGB Leds
Notes:
The RGB user calibration mode function allows up to 51 (00 to 50) different calibration sets to
be simultaneously stored on the Led Analyser. The Analyser is shipped from the factory in set
mode 00.
setcalibration## (## is 00 to 50) will enable which set you want to work in. While in
this mode you can vary the RGB gains and then save them in that version or set. The date of
this user calibration can also be saved using the command setcalibrationdatedd/mm/yyyy .
Using the getstatus or getcalibrationset commands the Led Analyser will display which user
calibration set you are enabled in and also the date you set it up.
For example if you are testing a board which has 2 different led Colour options you could
setcalibration01, adjust your gains or offsets as necessary and proceed to test your version 01
board. setcalibration02 and now adjust you gains or offsets as necessary for your other version
of the board and proceed to test your version 02 of the board. The user calibration date for
each set can be saved also.
Feasa provide a program called UserCal on the CD to accomplish this process.
Before doing the RGB calibration, we recommend you select the proper capture mode and
range for the Leds you are testing. Standard Capture (C, C1, C2….) mode is recommended
for static Leds whereas Capture PWM (eg. c2pwm05) is recommended for RGB LEDs that are
pulsing.
Select the relevant Range (Low, Medium High, Super & Ultra) by measuring the final color
combination that is going to be measured in the production and also the Blue Led segment
(Normally the Blue segment will have the highest Intensity) from the Led under test. Ensure
the
signal level is > 30 % in order to maximize the repeatability. Use the range which
captures these Intensity levels best.
For PWM mode you also need to select the best average factor (00-15) by doing a
repeatability analysis on the final colour. The higher the average number, the more repeatable
the results will be, However the higher the average the longer the capture time will be
required. The Feasa User software has a repeatability test analysis to help you on this task.
When this data is accumulated then proceed to the UserCal Program provided to set the RGB
gains.
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