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FEASA LED ANALYSER LOW LIGHT
FUNCTIONAL VERSION 

Introduction

The 

Feasa Low Light Analyser

 is an instrument that tests the Color and Intensity of Light 

Emitting Diodes (LEDs) in a Test Process.  It has been specifically designed to test Leds in low 

light situations such as backlit Switches and Panels.   The Analyser has up to 10* flexible 
Fiber-Optic Light Guides which are mounted individually over the LEDs to be tested.

Emitted Light from 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 of the Analyser through the 
Serial or USB Interfaces. 

The USB Interface is 2.0 compatible.

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

compatible with the RS-232C ports on machines. 

All colors are derived from the three primary colors, Red, Green and Blue (RGB). The RGB 
values are used to identify different color LEDs.

The raw data from the Led under test is stored on the Led Analyser and output in different

formats as required through the Serial and ICT interfaces.

* Other options include 3,5 & 6

Back to Index

5

Содержание Low Light LED Analyser

Страница 1: ...LOW LIGHT FUNCTIONAL VERSION User Manual for Low Light LED Analyser Feasa Enterprises Ltd Holland Road National Technology Park Castletroy Limerick Ireland www feasa ie Email sales feasa ie Rev 3 0 D...

Страница 2: ...A The Feasa 10 A model is a 10 channel unit which will test up to 10 LEDs while the Feasa 3 A is a 3 channel unit testing up to 3 LEDs The interface on these units is USB or Serial Copyright 2005 2021...

Страница 3: ...avelength Intensity 24 getcct Get the Correlated Colour Temperature 25 getintensity Get the Intensity 26 getABSINT Get the Absolute Intensity Value of the Led under test 27 getfactor Get the exposure...

Страница 4: ...se 53 SetCalibrationDateddmmyyyy Set the user Cal Date 54 getcalibrationdate Get the Calibration Date set by the user 55 HELP Command Summary Listing 56 Daisy Chain Mode 57 Daisy Chain USB Wiring Meth...

Страница 5: ...gh these Fiber Optic Light Guides to the Analyser where the raw data is stored The raw data can then be read out of the Analyser through the Serial or USB Interfaces The USB Interface is 2 0 compatibl...

Страница 6: ...evant information on the Led Analyser Please refrain from using Set commands in your high volume production programs as this constant writing to the Flash will eventually corrupt the Led Analyser Use...

Страница 7: ...tput of Saturation is NOT part of the International System of Units and is not an absolute or traceable unit of colour measurement It is part of the Hue Saturation and Relative intensity HSI system of...

Страница 8: ...lue 2 13 240 238 99 Yellow 76 171 8 95 96 Orange 224 28 2 7 99 White 71 72 112 See Page 10 37 Figure 2 The RGB or Hue values are used to identify different Colour LEDs Every LED tested by the LED Anal...

Страница 9: ...at influence Intensity Measurement The position of the Fiber in relation to the LED Offset from the Optical Centre of the LED The Gap between the end of the Fiber Light Guide and LED to be measured Th...

Страница 10: ...white LED s vary significantly with values of 30 being typical Remember the Saturation value is an indication of how white the LED is The correct values must be determined experimentally with the par...

Страница 11: ...nimum Maximum Red 0 2 Green 110 130 Blue 220 250 Amber 2 10 Yellow 60 80 Orange 10 20 Figure 5a The Saturation value must be taken into account when testing White LED s The Saturation is a value betwe...

Страница 12: ...Low Light Analyser Rear Panels Please refer to the fixturing Guidelines Manual for connector pin out details USB Port Control Connect the LED Analyser to the PC using the supplied USB cable Power is...

Страница 13: ...olonged Voltages 7V can damage the Analyser The Green LED should turn on to indicate the Analyser is ready for use The default serial communications settings are 57 600 Baud 8 Data bits 1 Stop bit and...

Страница 14: ...ands to from the Analyser This program is also available as a drop down function of the USER and Test Software programs The Feasa LED Analyser User Program is a graphical tool that can be used to send...

Страница 15: ...ed in internal memory of the LED Analyser The data is stored until the power is removed or another capture command is issued When completed the Analyser will transmit the character OK on the receive l...

Страница 16: ...shorter This command instructs the LED Analyser to read and store the Color and Intensity of all the LED s positioned under the fibers using a fixed range The range setting must be specified The data...

Страница 17: ...character Under Range Condition An under range condition will occur when insufficient light from the LED reaches the sensor for the range selected This will be indicated by 999 99 999 00000 for HSI 00...

Страница 18: ...to return RGB and Intensity data for fiber 01 10 in format rrr ggg bbb iiiii where rrr ggg and bbb are the red green and blue components of the color The iiiii value indicates the intensity value This...

Страница 19: ...ructs the LED Analyser to return Hue Saturation and Intensity data for fiber 01 10 in format hhh hh sss iiiii where hhh hh represents the Hue Color sss represents the Saturation whiteness of the LED u...

Страница 20: ...This command is used for testing White LED s This command should be preceded by a capture command to ensure valid LED data is stored in the memory of the LED Analyser The data for each LED can only b...

Страница 21: ...values are derived from the xy Chromaticity co ordinates including any xy offsets that may be applied This command should be preceded by a capture command to ensure valid LED data is stored in the mem...

Страница 22: ...the LED under the Fiber number This command should be preceded by the capture C command to ensure valid LED data is stored in the memory of the LED Analyser The C1 C5 commands are available but are no...

Страница 23: ...nant Wavelength for the LED under the Fiber number This command should be preceded by the capture C command to ensure valid LED data is stored in the memory of the LED Analyser The C1 C5 commands are...

Страница 24: ...erature CCT for the LED under the Fiber number This command should be preceded by the capture command to ensure valid LED data is stored in the memory of the LED Analyser The data for each LED can onl...

Страница 25: ...e valid LED data is stored in the memory of the LED Analyser The data for each LED can only be read out one at the time in any order using the getintensity command or all data can be read simultaneous...

Страница 26: ...Led under test at Fiber This command should only be used in conjunction with the Feasa LED Spectrometer Absolute Intensity values must first be measured with the Spectrometer The LED Analyser must th...

Страница 27: ...15 The default value is 01 Description This command is used to get the exposure factor value for all Fibers The default value set at the factory are 01 The values can be adjusted by the SetFactor comm...

Страница 28: ...for the Led under test at Fiber This command should only be used in conjunction with the Feasa LED Spectrometer Absolute Intensity values must first be measured with the Spectrometer The LED Analyser...

Страница 29: ...er in the range 01 15 Description This command returns the number of Captures that are averaged The minimum value is 01 and the maximum value is 15 A Capture command must be executed after the Average...

Страница 30: ...800 921600 for USB Port Description This command will get the baud rate of the Serial and USB Port s that the Analyser is communication through The default Port settings of the Analyser are 57 600 8 D...

Страница 31: ...dware Version Transmit Receive getHW Feasa XX YY Where XX YY is an alphanumeric value Description This command will return the hardware version the Analyser Example The PC transmits gethw to the LED A...

Страница 32: ...isabled Selected calibration set 00 user calibration date dd mm yyyy Factory calibration date dd mm yyyy Description This command will return a summary of the Led Analyser details Example The PC trans...

Страница 33: ...escription This command will return the Serial Number of the Analyser This is a unique number and is useful if multiple LED Analysers are used in a System The Controlling Software can query each LED A...

Страница 34: ...Transmit Receive getVersion xxxx Where xxxx is an alphanumeric value Always 4 characters Description This command will return the Version Number of the firmware in the Analyser Example The PC transmi...

Страница 35: ...or disabled using the commands ENABLEEOT and DISABLEEOT Having EOT character enabled can be extremely useful in multi line commands since this allows to differentiate between the end of a line and the...

Страница 36: ...only to store relevant information on the Led Analyser Please refrain from using Set commands in your high volume production programs as this constant writing to the Flash will eventually corrupt the...

Страница 37: ...is increased which will lead to longer test times i e Factor 02 will double the test time factor 03 will treble the test time etc Try the low range capture1 first before adjusting the Exposure Factor...

Страница 38: ...he user set the number of Captures to execute and calculate the Average value The minimum value is 01 and the maximum value is 15 A Capture command must be executed after the Average value has been ch...

Страница 39: ...alyser will not respond Please disconnect and reconnect the Analyser to return the Analyser to the default 57600 bps A correct baud rate selected will remain stored in memory even after power off The...

Страница 40: ...ou 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 setcalibration2 and now a...

Страница 41: ...sets setxoffset 0 setyoffset 0 7 Absolute Intensity Reading for Fiber getabsint Absolute Intensity Correction Factor setabsintmult 1 00000e 00 set the multiplier to 1 capture auto manual pwm getabsint...

Страница 42: ...some of the Fibers to give the same Intensity when testing similar LED s The Factory default setting is 100 and the value for each Fiber can be adjusted from 050 200 These set values are stored perman...

Страница 43: ...xxx represents the Intensity gain value Default 100 Description This command is used to get the Intensity gain value for each Fiber The default values set at the factory are 100 i e 100 of nominal Th...

Страница 44: ...in non volatile memory and will remain at the programmed setting until changed by a new Setxoffset command This put command is used to set an offset to the displayed x Chromaticity value The limit of...

Страница 45: ...in non volatile memory and will remain at the programmed setting until changed by a new Setyoffset command This put command is used to set an offset to the displayed y Chromaticity value The limit of...

Страница 46: ...ity offset Description This command is used to return the x Chromaticity offset for the LED under the Fiber number The value of this offset must be set by the setxoffset command The default value is 0...

Страница 47: ...ity offset Description This command is used to return the y Chromaticity offset for the LED under the Fiber number The value of this offset must be set by the setyoffset command The default value is 0...

Страница 48: ...ll remain at the programmed setting until changed by a new setwavelengthoffset command This put command is used to set an offset to the wavelength value The limit of the offset is 99 This command is u...

Страница 49: ...This command is used to get the value of the Dominant Wavelength Offset set for Fiber number The range of value that can be programmed is 99 however setting a value of greater than 10 would probably...

Страница 50: ...The default value of the offset is 0 000 The offset is stored in non volatile memory and will remain at the programmed setting until changed by a new Setyoffset command This put command is used to set...

Страница 51: ...number in the range 01 10 e represents the Absolute Intensity Correction Factor Description This command will allow the user to interrogate the Led Analyser to return the absolute Intensity Correction...

Страница 52: ...ETCALIBRATION stores the Calibration sets both on RAM and on EEPROM stays after power cycle but limits the number of set command operations to 100K The command PUTCALIBRATION only stores them on RAM a...

Страница 53: ...s command is used in conjunction with the user calibration set mode These dates are stored permanently in memory and can only be changed by using the setcalibrationdate command again The command getca...

Страница 54: ...rn the actual USER Calibration Date in the format dd mm yyyy This is the date set by the user for a specific cal version Example Connect the Analyser to the Terminal Window and using the getcalibratio...

Страница 55: ...Listing Transmit Receive help Command listing Description This command will generate a summary listing of all the LED Analyser commands This is useful when using a terminal program such as HyperTermin...

Страница 56: ...ons and simplify the wiring The 1st Led analyser in the chain is connected to the computer using the USB cable supplied The remaining LED Analysers are interconnected in a Daisy Chain Bus using the ca...

Страница 57: ...to the computer using the Serial cable supplied The remaining LED Analysers are interconnected in a Daisy Chain Bus using the cables provided The Daisy Chain OUT connector on Led Analyser No1 is conne...

Страница 58: ...e CD to carry out this The LED Analyser connected to the computer receives a command and this command is received by all the other LED Analysers through the Daisy Chain Bus All Analysers in the chain...

Страница 59: ...ive This command should be issued at the start of a sequence It is the responsibility of the Controlling Computer to issue commands and monitor the responses If an Analyser does not respond within 500...

Страница 60: ...by a BusFree command All the Capture Set Get etc commands can now be used with the active Analyser in the chain It is the responsibility of the Controlling Computer to issue commands and monitor the...

Страница 61: ...tiate a capture sequence using the Automatic Range Mode To specify a Range manually see the command BusC on the next page After the capture cycle use the the command BusGet to activate a specific LED...

Страница 62: ...gher ranges lead to faster test times because the exposure time is shorter This command should be preceded by a BusFree command This command instructs all LED Analyser s in the Daisy Chain to capture...

Страница 63: ...yser If reply is 1 Then Capture is complete If reply is 0 No Capture No reply Led Analyser is busy Timeout 10mS Description This command is used to verify that after a busc global capture each Analyse...

Страница 64: ...alyser in the chain The Power Connector is used to supply 5V DC to each Analyser in the chain Allow 220mA 5V for each Analyser and ensure the wiring is adequate to supply the current without incurring...

Страница 65: ...D GND Figure 11 Figure 11 shows the layout of the Connectors viewed from the edge of the board The GND line of D_OUT is connected with the GND line of D_IN the RX_out of D_OUT is connected to RX_in of...

Страница 66: ...Connect Daisy_Out of s nF461 to Daisy_In of s nF201 Connect Daisy_Out of s nF201 to Daisy_In of s nF006 5 Next locate the 2 pin Power cable supplied to s n F461 s n F201 and s n F006 Analysers It is n...

Страница 67: ...lyser 3 s n F201 send the following busfree OK Response from the Analyser busgetF201 OK Response from the Analyser 12 It is possible to instruct all Analysers in the chain to capture LED data simultan...

Страница 68: ...OK getserial Confirm s n of the Analyser F304 gethsi01 Get the Data for Fiber 1 000 51 100 36491 gethsi02 gethsi10 120 51 100 66542 Data for Fiber 10 busfree OK busceF461 1 busgetF461 Connect to the...

Страница 69: ...FEASA LED ANALYSER LOW LIGHT FUNCTIONAL VERSION 69 Begin OK Serial Number First Serial BUSFREE BUSC OK BUSCE Answer Serial Number Next serial End Serial End NO YES 1 NO NO YES YES...

Страница 70: ...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 99999 2 Alternatively the Led Anal...

Страница 71: ...LED getHSIall Get Hue Saturation and Intensity for all LEDs getxy Get the xy Chromaticity values getxyall Get the xy Chromaticity values for all LEDs getxoffset Get x chromaticity offset getyoffset G...

Страница 72: ...related Color Temperature for LED getcctall Get Correlated Color Temperature for all LEDs getVersion Get the Firmware Revision of the Analyser getHW Get the Hardware Version of the Analyser setbaud Se...

Страница 73: ...mium Bend Radius 15mm Fiber Core Diameter 1 0mm Number of Fibers 3 5 6 10 Operating Temperature Range 00 C to 500 C Electrical Supply Voltage 5 0V Supply Current 100 mA USB 2 0 Interface Serial RS232...

Страница 74: ...e purchase price upon prompt return of the product to Feasa 4 Feasa products may contain re manufactured parts equivalent to new in performance or may have been subject to incidental use 5 The warrant...

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