Feasa Legend Manuel utilisateur

Feasa Legend LED Analyser

User Manual for Hub and Satellite

Feasa Enterprises Ltd,

Holland Road,

National Technology Park,

Castletroy,

Limerick,

Ireland.

www. easa.ie

Email: sales@ easa.ie

Rev. 1.20

Date: Dec, 2019

HUB Satellite

Satellite

Feasa Legend LED Analyser

About this 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 the Feasa Hub and Satellite LED Analyser The model numbers are

Hub, Feasa xL. (where x is the number o Fibers either 10 or 20)

The inter ace on the Hub units is USB or RS232-Serial and the Satellites are inter aced via a 6

pin connector.

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

mechanical, including photocopying, recording, or any other storage and retrieval

system without prior permission in writing from Feasa Enterprises Ltd. Every effort

has been made to ensure that the information in this manual is accurate. Feasa

Enterprises Limited is not responsible for printing or clerical errors.

Feasa Legend LED Analyser
Table of Contents
Introduction..........................................................................................................................................5
Colour and Saturation...........................................................................................................................6
Intensity................................................................................................................................................8
White LED's.......................................................................................................................................10
Setting  olerance Limits for Colour and Intensity.............................................................................11
Product Description............................................................................................................................12
Hub and Satellite Block Diagram..................................................................................................13
Mode of Operation.........................................................................................................................14
Hub Controller Module..................................................................................................................15
External Input Port.............................................................................................................................16
External Input Logic Levels:.........................................................................................................17
Functional description....................................................................................................................19
Limit group....................................................................................................................................19
 est.................................................................................................................................................20
USB Port Control...............................................................................................................................30
Serial Port Control..............................................................................................................................30
LED Analyser Module (Satellite).......................................................................................................31
Physical Layout..............................................................................................................................31
Capture Commands............................................................................................................................32
AU O    CAP URE -    Store LED Data.......................................................................................33
MANUAL CAP URE - Store LED Data for a specific range.................................................34
Get Data Commands...........................................................................................................................35
Under Range Condition............................................................................................................35
Over Range Condition..............................................................................................................35
getRGBI### - Get RGB and Intensity for a LED.....................................................................36
getRGBIall - Get RGB and Intensity for all LEDs...................................................................37
getHSI### - Get Hue, Saturation and Intensity........................................................................38
getHSIall - Get Hue, Saturation and Intensity..........................................................................39
getWAVELENG H### - Get the Dominant Wavelength.........................................................40
getWavelengthall - Get the Dominant Wavelength...................................................................41
getWAVELENG HOFFSE @@ - Get the Wavelength Offset...............................................42
getWI### - Get the Dominant Wavelength and Intensity.........................................................43
getWIall - Get the Dominant Wavelength.................................................................................44
getxy### - Return the xy Chromaticity values.........................................................................45
getxyall - Return the xy Chromaticity values...........................................................................46
getxyi### - Return the xy Chromaticity & Intensity values.....................................................47
getxyiall - Return the xy Chromaticity values..........................................................................48
getxoffset### - Return the x Chromaticity offset......................................................................49
getyoffset### - Return the y Chromaticity offset......................................................................50
getCC  - Get Correlated Color temperature.............................................................................51
getCC all - Get Correlated Color temperature.........................................................................52
getCC Iall - Get Correlated Color temperature & Intensity....................................................53
getuv### - Return the u'v' Chromaticity values........................................................................54
© Copyright Feasa Enterprises Ltd                                                              3

Feasa Legend LED Analyser
getuvall - Return the u'v' Chromaticity values..........................................................................55
getIntensity### - Get the Intensity............................................................................................56
getIntensityall - Get the Intensity..............................................................................................57
getIntGain###- Get the Intensity Gain Factor...........................................................................58
getfactor - Get the exposure Factor...........................................................................................59
General Set Commands......................................................................................................................60
SetIntGain - Set the Intensity GainFactor.................................................................................61
SetFactor - Set the Exposure Factor..........................................................................................62
Setxoffset - Set the x Chromaticity Offset................................................................................63
setyoffset - Set the y Chromaticity Offset.................................................................................64
setwavelengthoffset - Set the wavelength Offset......................................................................65
Hub    Commands..................................................................................................................................66
GetStatus - Get the Status Information of the Hub...................................................................67
GetSerial - Get the Serial Number of the Hub..........................................................................68
GetVersion - Get the Firmware Version....................................................................................69
GetHW - Get the Hardware Version.........................................................................................70
Setbaud - Change the baud rate of the Serial Port....................................................................71
SetPrinterbaud- Set the Printer baud rate of the Serial Port......................................................72
PrinterOn -  urn on the Printer function...................................................................................73
PrinterOff -  urn off the Printer function..................................................................................74
Automated  est Commands and Functions........................................................................................75
Detect - detect LED Analysers..................................................................................................77
getPortinfo - list all connected LED Analysers.........................................................................78
getPortDetails - list all connected Satellites with Serial No's...................................................79
HubReset - Executes a Reset on the Hub..................................................................................80
GetNFib - Get the total number of Fibers.................................................................................81
setLimitGroup - set the active limits group...............................................................................82
GetLimitGroup - get the active limits group.............................................................................83
Capture est - Automatically Capture and  est LED's..............................................................84
CaptureMultiRange - Automatically Capture and  est LED's..................................................85
 est - Automatically  est LED's................................................................................................86
Reportlimit - Limit the number of reported failures.................................................................87
Reportfailures - Return failure data only..................................................................................88
 esting Boards on a Panel..................................................................................................................89
SetBoardEnable - Enable all Fibers on a Satellite Number......................................................90
setBoardEnableAll - Enable all Fiber Channels........................................................................91
SetBoardDisable - Disable all Fibers on Satellite Number.......................................................92
SetBoardDisableAll - Disable all Fiber Channels.....................................................................93
GetBoardEnableStatus### - Return the Status of a Board........................................................94
Get estResult - Return the  est Result of a Panel....................................................................95
Command Summary...........................................................................................................................96
Specifications.....................................................................................................................................98
Warranty.............................................................................................................................................99
© Copyright Feasa Enterprises Ltd                                                              4

Feasa Legend LED Analyser

Introduction

The Feasa Legend system is an instrument that tests the HSI (Hue, Saturation, Intensity), RGB

(Red, Green, Blue Colour content o a single LED), xy Chromaticity, Dominant Wavelength and

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

can have up to 20* lexible Fiber-Optic Light Guides which are mounted individually over the

LEDs to be tested.

The Satellite Analyser uses Optical Heads connected to lexible Optical ibers which are

mounted individually over the LEDs to be tested.

Emitted Light rom the LEDs is guided through the Optical ibers to the Satellite Analyser

where the Colour and Intensity are tested. The test results can then read out using Feasa-

supplied so tware programs or through User-generated so tware.

There are two component parts to the Legend LED Analyser:- A Satellite LED Analyser module

which is mounted on the Test Fixture and a Hub Module which is used to control up to 8

Satellite LED Analysers.

The Feasa-supplied Programs communicate with the Hub module through a USB or Serial port

on the Hub.

Colour, Saturation and Intensity values are output as ASCII strings through the Inter aces on

the Hub Module.

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

values are used to identi y the colour o LEDs.

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

The results or each LED to be tested can be read out through the USB and Serial Ports.

In addition, the system has the capability to 'learn' Test values rom known

good LED's and automatically assign Pass and Fail limits. The system can

test the LED's automatically and generate Pass and Fail results.

This signi icantly reduces the amount o so tware generation required. One

command is all that is required to test up to 160 LED's.

Back to Index

Feasa Legend LED Analyser

Colour and Saturation

Figure 1: Hue (Color) Wheel

RED = 0º

GREEN = 20º

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 Legend System output o Saturation 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 Saturation. 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 Legend system or each channel o the Satellite Analyser, relative to the LED

under test.

There is a consistency in the Saturation readings between all Feasa Products, 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.

Back to Index

Feasa Legend LED Analyser

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

LED R G B HUE SATURAT ON

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 or analysis.

Back to Index

Feasa Legend LED Analyser

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 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 Analyser can be set in either Linear mode or Logrithmic modes to measure Intensity o

the LED. The units are shipped rom the actory in Logarithmic mode. See setlog and setlin

commands to determine how to set the mode o the analyser. Use the getstatus 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.

There are 6 capture ranges each with an intensity output range of 0 to 99,999. Feasa

recommends that the UUT readings should be in the K to 8 K range for the best

stability.

Figure 3a. ntensity for the LED Analyser in LOGAR THM C Mode

Back to Index

0 100000 200000 300000 400000 500000 600000 700000 800000

10000

20000

30000

40000

50000

60000

70000

80000

90000

100000

lx (X1000)

RELATIVE INTENSITY

Feasa Legend LED Analyser

Figure 3b. ntensity for the LED Analyser in L NEAR Mode

Back to Index

Feasa Legend LED Analyser

White LED's

White LED's must be treated di erently to coloured LED's when being tested. White is not a

colour – it is a mix o all other colours. The three Primary colours Red, Green and Blue will be

mixed in approximately equal proportions to display a White colour. The Saturation value

should be used when testing White LED's. The Saturation is a value between 0% and 100%.

A value o 0% indicates a pure White and a value o 100% indicates a pure Colour.

In reality, the Saturation value o white LED's vary signi icantly with values o 30% being

typical. Remember, the Saturation value is an indication o how white the LED is.

The correct values must be determined experimentally with the particular LED's to be tested.

Most LED manu acturers will speci y their White LED's using Chromaticity co-ordinates xy.

This is a two-dimensional Chart with x on the horizontal axis and y on the vertical axis. The

range o x and y lies between 0 and 1.

Figure 4. C E 1931 Chromaticity Co-Ordinates

White LED's will have approximate co-ordinates o 0.33, 0.33. This may vary depending on the

manu acturer o the LED where some LED's will have a Blue tint (cool white) and the other

LED's will have a Red tint (Warm White).

Back to Index

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