Feasa 20-F Manuel utilisateur

FEASA LED ANALYSER

FUNCTIONAL VERSION

User Manual for Feasa Functional Models

Feasa Enterprises Ltd,

Holland Road,

National Technology Park,

Castletroy, Limerick, Ireland.

www. easa.ie

Email: sales@ easa.ie

Rev. 8.7 Functional Version

Date: September 2020

FEASA LED ANALYSER

FUNCTIONAL VERSION

About t is Manual

Feasa operates a policy o continuous development. Feasa reserves the right to make changes

and improvements to any o the products described in this document without prior notice.

Feasa reserves the right to revise this document or withdraw it at any time without prior

notice.

This manual is written or models Feasa Functional Led Analysers. The model numbers are

Feasa x-F, Feasa x-FB, Feasa x-LT (where x is the number o ibers either 2,3,5,6,10,20).

The Feasa 20-F is a standard 20 channel Analyser which will test up to 20 LED's while the

Feasa 3-F is a standard 3 channel Analyser testing up to 3 LED's.

The Feasa 20-FB is a High Brightness 20 channel unit which will test up to 20 LED's while the

Feasa 3-FB is a 3 channel High Brightness unit testing up to 3 LED's.

The Feasa 20-LT is a Li e Tester 20 channel unit which will test up to 20 LED's in an oven

while the Feasa 3-LT is a 3 channel Li e Tester unit testing up to 3 LED's.

The inter ace on these units is USB or RS232-Serial.

manual may be reproduced or retransmitted in any form or means, electronic or

mec anical, including p otocopying, recording, or any ot er storage and retrieval

system wit out prior permission in writing from Feasa Enterprises Ltd. Every effort

as been made to ensure t at t e information in t is manual is accurate. Feasa

Enterprises Limited is not responsible for printing or clerical errors.

FEASA LED ANALYSER
FUNCTIONAL VERSION 
Table of Contents
Introduction..........................................................................................................................................6
IMPORTANT INFORMATION for Programmers...............................................................................7
Colour and Saturation...........................................................................................................................8
Intensit ..............................................................................................................................................10
Photopic Response..............................................................................................................................12
White LED's.......................................................................................................................................13
Setting Tolerance Limits for Colour and Intensit .............................................................................14
Ph sical La out..................................................................................................................................15
USB Port Control...............................................................................................................................15
Serial Port Control (RS232)...............................................................................................................16
Trigger Port Control...........................................................................................................................17
Capture Commands........................................................................................................................18
Capture Times Static Leds........................................................................................................18
AUTO    CAPTURE -    Store LED Data   .......................................................................................19
MANUAL CAPTURE - Store LED Data for a specific range.................................................20
Capture Times PWM Leds........................................................................................................21
AUTO CAPTUREPWM - Store PWM LED Data...................................................................21
MANUAL CAPTUREPWM - Store PWM LED Data for a specific Range............................22
CAPTUREMULTI - Multiple Capture Command....................................................................23
Get Data Commands...........................................................................................................................24
Under Range Condition............................................................................................................24
Over Range Condition..............................................................................................................24
Incorrect Capture Mode............................................................................................................24
getRGBI## - Get RGB and Intensit  for a LED.......................................................................25
getHSI## - Get Hue, Saturation and Intensit ..........................................................................26
getx ## - Return the x  Chromaticit  values...........................................................................27
getx i## - Return the x  Chromaticit  & Relative Intensit  values.........................................28
getCIEXYZ## - Return the CIE 1931 XYZ Colour values......................................................29
getUV## - Return the u'v' Chromaticit  values........................................................................30
getWAVELENGTH## - Get the Dominant Wavelength...........................................................31
getWI## - Get the Dominant Wavelength & Intensit ..............................................................32
getWSI## - Get the Dominant Wavelength, Saturation & Intensit .........................................33
getCCT## - Get the Correlated Colour Temperature................................................................34
getINTENSITY## - Get the Relative Intensit .........................................................................35
getABSINT@@ Get the Absolute Intensit  Value of the Led under test.................................36
getSIGNALLEVEL## - Get the Relative Intensit  in a percentage of the Range....................37
getFACTOR - Get the exposure Factor.....................................................................................38
get7SEG# - Get the value of a 7 Segment Displa ...................................................................39
getAUTOPWM - Get which Auto Capture Mode is active C or CPWM.................................40
getintensit mode - Get which Intensit  Mode is active Logarithmic or Linear.......................41
getPHOTOPIC - Get which Photopic Mode is active...............................................................42
getBAUD - Get the Baud Rate..................................................................................................43
getHW - Get the Hardware Version..........................................................................................44
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FEASA LED ANALYSER
FUNCTIONAL VERSION 
getSTATUS - Get a summar  of the Led Anal ser details........................................................45
getSERIAL Get the Serial Number of the Anal ser.................................................................46
getVERSION - Get the Firmware Version................................................................................47
EOT - End of Transmission Character......................................................................................48
General    Set/   Put      Commands   ................................................................................................................49
set/putFACTOR## - Set the Exposure Factor...........................................................................50
set/putLOG - Change the Intensit  Response of the Anal ser to Logarithmic mode...............51
set/putLIN - Change the Intensit  response of the Anal ser to Linear Mode...........................52
setBAUD - Change the baud rate..............................................................................................53
setAUTOPWM# - Change the Auto Capture mode to Auto PWM Mode................................54
s  et   PHOTOPIC    -    Set      which    Photopic    Mode     ou require   ...........................................................55
User Calibration Mode.......................................................................................................................56
Introduction:..............................................................................................................................56
UserCal Manual Procedure:......................................................................................................57
set/putINTGAIN - Set the Intensit  GainFactor.......................................................................58
getINTGAIN## - Get the Intensit  Gain Factor.......................................................................59
set/putXOFFSET##0.xxx - Set the x Chromaticit  Offset.......................................................60
set/putYOFFSET##0.xxx - Set the   Chromaticit  Offset.......................................................61
getXOFFSET## - Return the x Chromaticit  offset.................................................................62
getYOFFSET## - Return the   Chromaticit  offset.................................................................63
set/putWAVELENGTHOFFSET@@±## - Set the wavelength Offset....................................64
getWAVELENGTHOFFSET@@ - Get the Dominant Wavelength Offset..............................65
set/putABSINTMULT@@ - Set the Absolute Intensit  Multiplier Factor..............................66
getABSINTMULT@@ Get the Absolute Intensit  Correction Factor of the Led under test...67
setCALIBRATION## - Select the Calibration Set to use.........................................................68
getCALIBRATIONset - Select the Calibration Set to use........................................................69
ResetUserCal##- Reset the standard usercal setting to factor  default.....................................70
ResetRGBM - Reset the RGB usercal setting to factor  default..............................................71
SetCalibrationDateddmm  - Set the user Cal Date.............................................................72
getcalibrationdate Get the Calibration Date set b  the user......................................................73
User Calibration for RGB Leds..........................................................................................................74
External Trigger Mode.......................................................................................................................75
External Trigger Method:..........................................................................................................75
Sequence Capture Mode:....................................................................................................................76
Introduction...............................................................................................................................76
Capture Sequence Procedure:...................................................................................................77
Set/Put SequenceMode# - Set sequence mode for Fibers.........................................................78
Set/Put SequenceChannel@@ - Select sequence mode Fiber No............................................79
Set/Put SequenceCapture##(#) - Set Sequence Capture Time..................................................80
Set/Put SequenceWait##(#) - Set Sequence Wait Time............................................................81
Set/Put SequenceNumber###(#) - Set the Number of Captures...............................................82
Set/Put SequenceThreshold##### - Set the Intensit  Threshold..............................................83
Set/Put SequenceStartDela ### - Set dela  in ms before sequencecapture starts....................84
CaptureSequence - Start the Captures.......................................................................................85
StoreSequence## - Store the sequence pattern..........................................................................86
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FEASA LED ANALYSER
FUNCTIONAL VERSION 
Identif Sequence - Identif  the current sequence pattern.........................................................87
ResetSequence## - Reset a sequence pattern............................................................................88
GetSequenceStored## - Get a sequence pattern........................................................................89
GetSequence@@ - Get the binar  sequence of Intensities.......................................................90
GetSequenceTimes@@ - Get the Dut  C cle of the Sequence................................................91
GetSequenceTimesAll - Get the Dut  C cle of the Sequence for all fibers.............................92
GetFrequenc ## - Returns the frequenc  and dut  c cle of Led..............................................93
Get(Max/Min/Avg)Intensit ## - Returns the Max/Min or Avg Intensit  for the Seq Cap.......94
GetFlicker## - Returns the Flicker Index and frequenc  after a Seq Cap................................95
GetSequenceMode# - Get sequence mode for Fibers...............................................................96
GetSequenceChannel - Select sequence mode Fiber No..........................................................97
GetSequenceCapture - Get Sequence Capture Time.................................................................98
GetSequenceWait - Get Sequence Wait Time...........................................................................99
GetSequenceNumber - Get the Number of Captures..............................................................100
GetSequenceThreshold - Get the Intensit  Threshold............................................................101
GetSequenceStartDela  - Get the dela  before the CS command..........................................102
Dais  Chain Mode............................................................................................................................103
Dais  Chain USB Wiring Method:.........................................................................................103
Dais  Chain Serial RS232 Wiring Method:............................................................................104
Dais  Chain Baudrate:............................................................................................................105
Dais  Chain Identification:.....................................................................................................105
BusFree - Deactivate an  active Anal sers.............................................................................106
BusGet#### - Activate a LED Anal ser.................................................................................107
BusC - Initiate Capture for all LED Anal ser's.......................................................................108
BusC# - Initiate Capture for all LED Anal ser's.....................................................................109
BusC#pwm@@ - Store PWM LED Data for a specific Range..............................................110
BusCE#### - Poll each LED Anal ser to verif  a capture is complete..................................111
Ports Description and Wiring..................................................................................................112
Dais  Chain Pinout..................................................................................................................113
Step-b -Step method for Dais  Chaining...............................................................................114
Example...................................................................................................................................116
Step-b -Step approach to Testing a LED.........................................................................................118
Effect of PWM on Intensit  Testing.................................................................................................119
Step-b -Step approach to Testing a PWM LED...............................................................................120
Testing a 7-Segment Displa ............................................................................................................121
Command Summar :........................................................................................................................122
Feasa Software..................................................................................................................................125
Documentation Folder.................................................................................................................125
Feasa Terminal.............................................................................................................................125
User Software..............................................................................................................................126
Test Software...............................................................................................................................127
User Calibration...........................................................................................................................128
Programming...............................................................................................................................129
Specifications...................................................................................................................................130
Warrant ...........................................................................................................................................132
5

FEASA LED ANALYSER

FUNCTIONAL VERSION

Introduction

The Feasa LED Analyser is an instrument that tests the HSI (Hue, Saturation, Intensity),

RGB (Red, Green, Blue Colour content o a single LED), xyChromaticity, Dominant Wavelength

and cct Colour temperature o Light Emitting Diodes (LEDs) in a test process. An individual Led

Analyser can have up to 20* 1mm lexible Fiber-Optic Light Guides which are mounted

individually over the LEDs to be tested.

The Feasa Led Analyser can be trained to read other Led Parameters like Absolute Intensity

and CIEXYZ in Luminous lux (lm), Luminous intensity (cd, mcd), Luminance (cd/m^2). It can

also be trained to interpret the data rom an RGB Led. These outputs will require the use o the

Feasa Led Spectrometer.

Emitted Light rom the LEDs is guided through these Fiber-Optic Light Guides to the Analyser

where the raw data is stored. The raw data can then be read out o the Analyser through the

Serial or USB Inter aces.

The USB Inter ace is 2.0 compatible.

The Serial Inter ace is a 3-Pin Connector with a 3 pin to 9 pin dtype cable (supplied)

compatible with the RS-232C ports on machines.

All Colours are derived rom the three primary Colours, Red, Green and Blue (RGB). The RGB

values are used to identi y di erent Colour LEDs.

The raw data rom the Led under test is stored on the Led Analyser and output in di erent

ormats as required through the USB and Serial inter aces.

* Other options include 2,3,5,6,10.

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FEASA LED ANALYSER

FUNCTIONAL VERSION

IMPORTANT INFORMATION for Programmers

set / put Commands

The Set / Put commands are used to adjust various settings in the LED Analyser such as

Intensity, Exposure and o sets.

The Set commands are written to the on-board Flash.

These settings remain programmed in the Analyser even when the power is removed.

The Led Analyser has a capacity limit o approximately 100,000 writes to the lash.

Use the Set command only to store relevant in ormation on the Led Analyser. Please re rain

rom using Set commands in your high volume production programs as this constant writing to

the Flash will eventually corrupt the Led Analyser. Use the Put command instead.

The Put commands are written to the on-board RAM.

These settings will NOT remain programmed in the Analyser a ter the power is removed.

Use the Put command as o ten as you need in your program. This will prolong the li e o the

Led Analyser particularly in high volume testing environment.

Commands are transmitted and received using ASCII characters and are case-insensitive.

All commands must be terminated with a <CR> or <LF> character.

Back to Index

FEASA LED ANALYSER

FUNCTIONAL VERSION

Colour and Saturation

Figure 1: Hue (Colour) Wheel

RED = 0º

GREEN = 120º

BLUE = 240º

Colours can represented by a 360° degree circular Colour wheel. The three Primary RGB values

can also be represented as a single value called Hue. Hue is a measured location on a Colour

wheel and is expressed in degrees. For example, Red will have a Hue value near 0°, Green

will have a Hue value near 120° and Blue will have a value near 240°.

A pure Colour will be represented on the Colour wheel as a point near the outer edge. White

will be represented by a point near the center o the wheel. The degree o whiteness in a LED

will a ect its position on the wheel – the greater the amount o white the closer it will be to the

center.

The Feasa Led Analyser output o Sa ura ion is NOT part o the International System o Units.

and is not an absolute or traceable unit o colour measurement. It is part o the Hue Saturation

and Relative intensity (HSI) system o describing colour. The degree o whiteness emitted by

the LED is represented by the term Sa ura ion. A Saturation value o 0% represents pure

White. A Saturation value o 95 - 100% represents a pure Colour such as Red, Blue, Green,

etc. It is a relative output much the same as the Relative Intensity output, and is used to

compare similarly coloured LEDs under test. The Saturation values are calculated within the

Feasa Led Analyser or each channel o the LED Analyser, relative to the LED under test.

There is a consistency in the Saturation readings between all Feasa Led Analysers, or LEDs o

a similar colour, in a similarly constructed ixture.

Usually the user must determine the Hue and Saturation values by testing a number o LED's

and recording the results.

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FEASA LED ANALYSER

FUNCTIONAL VERSION

The RGB and Hue values in Figure 2 show how di erent Colour LEDs can be identi ied.

LED R G B HUE SATURATION

Red 253 1 1 0 100%

Green 24 208 23 120 89%

Blue 2 13 240 238 99%

Yellow 76 171 8 95 96%

Orange 224 28 2 7 99%

White 71 72 112 See Page 13 21%

Figure 2.

The RGB or Hue values are used to identi y di erent Colour LEDs.

Every LED tested by the LED Analyser will have a set o RGB values generated or analysis.

These values are converted automatically to Hue and Saturation (whiteness) and can be read

out through the Serial or ICT ports.

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FEASA LED ANALYSER

FUNCTIONAL VERSION

Intensity

Intensity is a measure o the amount o light being emitted by the LED. The Analyser tests the

Intensity o each LED and outputs this value to the Test System. The value is output as a

number in the range 0 - 99,999. The Analyser is calibrated to a ixed standard and all

measurements are relative. The Intensity output reading is NOT part o the International

System of nits and is not an absolute or traceable unit o colour measurement. It is part o

the Hue Saturation and Relative intensity (HSI) system o describing colour.

The Analyser can be set in either Linear mode or Logarit mic modes to measure Intensity o

the LED. The units are shipped rom the actory in Logarithmic mode. See set/ put log and

set/ put lin commands to determine how to set the mode o the analyser. Use the

get intensitymode command to determine which intensity measure mode the Analyser is set to

Factors that in luence Intensity Measurement:

The position o the Fiber in relation to the LED.

O set rom the Optical Centre o the LED.

The Gap between the end o the Fiber Light Guide and LED to be measured.

The condition o the Fiber end. It must be kept clean with a 90º Cleave.

Is the LED Static or Flashing ?

External In luences – Other LEDs in close proximity, Ambient Lighting.

Is an Optical Head being used.

T ere are 6 capture ranges eac wit an intensity output range of 0 to 99,999. Feasa

recommends t at t e UUT readings s ould be in t e 55K to 85K range for t e best

stability.

Figure 3a. In ensi y for he LED Analyser in LOGARITHMIC Mode

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