Feasa 10-IR User manual

FEASA LED ANALYSER

INFRA RED VERSION

User Manual for Infrared Models

Feasa Enterprises Ltd,

Holland Road,

National Te hnology Park,

Castletroy,

Limeri k,

Ireland.

www.feasa.ie

Email: [email protected]

Rev. 2.5 Infra Red Version

Date: Nov, 2021

FEASA LED ANALYSER

INFRA RED VERSION

About this Manual

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

and improvements to any of 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 for Feasa Infrared LED nalysers. These nalysers have been designed

to test Infra-Red LED's only.

The 20-IR model will test up to 20 LED's, the 10-IR will test up to 10 LED's and the 3-IR will

test up to 3 LED's all with a Peak Wavelength range of 700nm - 950nm.

The 20-IRP model will test up to 20 LED's, the 10-IRP will test up to 10 LED's and the 3-IRP

will test up to 3 LED's with a Peak Wavelength range of 700nm - 900nm.

manual may be reprodu ed or retransmitted in any form or means, ele troni or

me hani al, in luding photo opying, re ording, 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 a urate. Feasa

Enterprises Limited is not responsible for printing or leri al errors.

FEASA LED ANALYSER
INFRA RED VERSION
Table of Contents
Important Safety Information...............................................................................................................5
Introduction..........................................................................................................................................6
Intensity................................................................................................................................................7
Setting Tolerance Limits for Peak Wavelength and Intensity............................................................... 
Physical Layout....................................................................................................................................9
USB Port Control.................................................................................................................................9
Serial Port Control..............................................................................................................................10
Capture Commands............................................................................................................................11
Auto CAPTURE - Store LED Peak Wavelength and Intensity Data.............................................12
Manual CAPTURE# - Store LED Peak Wavelength and Intensity Data......................................13
Auto CAPTUREPWM - Capture PWM LED Peak Wavelength and Intensity.............................14
Manual CAPTURE#PWM@@ - Store LED Peak Wavelength and Intensity Data PWM LED's 15
Get Data Commands...........................................................................................................................16
Under Range Condition.................................................................................................................16
Over Range Condition...................................................................................................................16
getIR## - Return the Peak Wavelength and Intensity values.........................................................17
getWavelength## - Get the Peak Wavelength................................................................................1 
getINTENSITY## - Get the Intensity............................................................................................19
getWI## - Get the Peak Wavelength & Intensity...........................................................................20
getSIGNALLEVEL## - Get the Relative Intensity in a percentage of the Range........................21
getIntGain - Get the Intensity Gain Factor....................................................................................22
getfactor - Get the exposure Factor................................................................................................23
getWAVELENGTHOFFSET@@ - Get the Peak Wavelength Offset...........................................24
getBAUD - Get the Baud Rate......................................................................................................25
getHW - Get the Hardware Version...............................................................................................26
getSTATUS - Get a summary of the Led Analyser details............................................................27
getSERIAL Get the Serial Number of the Analyser......................................................................2 
getVERSION - Get the Firmware Version.....................................................................................29
General    Set    Commands   ......................................................................................................................30
SetIntGain - Set the Intensity GainFactor......................................................................................31
SetFactor## - Set the Exposure Factor..........................................................................................32
set WAVELENGTHOFFSET@@±## - Set the wavelength Offset..............................................33
Daisy Chain Mode..............................................................................................................................35
Daisy Chain Communication.............................................................................................................37
help - Command Summary Listing................................................................................................50
Step-by-Step approach to Testing a LED...........................................................................................51
Effect of PWM on Intensity Testing...................................................................................................52
3

FEASA LED ANALYSER

INFRA RED VERSION

Step-by-Step approach to Testing a PWM LED.................................................................................53

Intensity Response..............................................................................................................................54

Command Summary...........................................................................................................................55

Specifications.....................................................................................................................................56

Warranty.............................................................................................................................................57

FEASA LED ANALYSER

INFRA RED VERSION

Important Safety Information

When using the Feasa -IR (Glass Fiber version) Eye protection must

be worn at all times when handling the Led nalyser or the Fibers.

Care should be taken when handling the bare ends of the Fibers

because they are composed of glass and may scratch unprotected

areas.

Infrared protection should be worn when working with Infrared

LED's and sources. Infrared light is invisible to the naked eye and

may cause damage to the eye or skin if exposed to high levels of

radiation.

Back to Index

FEASA LED ANALYSER

INFRA RED VERSION

Introdu tion

The Infrared Series of Feasa LED nalysers have been designed to test Infrared LED's only. The

nalyser is supplied in 3, 10, 20 channel versions with Plastic Fibers 700-900nm Peak

Wavelength range and Glass Fibers 700-950nm Peak Wavelength range.

Infrared LED's are invisible to the naked eye when lighted and these nalysers can be used to

test the Peak Wavelength and Relative Power (Intensity) of these LED's.

The Feasa 20-IR nalyser has 20* Glass Fiber-Optic Light Guides which are mounted

individually over the LEDs to be tested.

The Feasa 20-IRP nalyser has 20* Plastic Optical Fiber 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 nalyser

where the Peak Wavelength and Intensity are tested. The test results can then read out of

the nalyser through the Serial or USB Interfaces.

The USB Interface is 2.0 compatible and the Serial Interface is RS-232C compatible.

Peak Wavelength and Intensity values are output as SCII strings through the USB and Serial

Interfaces.

* There are 10 channel and 3 channel versions available.

Back to Index

FEASA LED ANALYSER

INFRA RED VERSION

Intensity

Intensity is a measure of the amount of light being emitted by the LED.

The nalyser tests the Intensity of each LED and outputs this value to the Test System. The

value is output as a number in the range 0-99999. The nalyser is calibrated to a fixed

standard and all measurements are relative. The Intensity output reading 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 Wavelength and Relative intensity (WI) system of describing colour.

The Infra Red nalyser is set to measure Intensity on a Linear scale.

Factors that 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.

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

Is the LED Static or Flashing ?

External Influences – Other LEDs in close proximity, mbient Lighting.

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 50K to 90K range for the best

stability.

Figure . Relative Intensity Response

Back to Index

0 100 200 300 400 500 600 700 800 900

10000

20000

30000

40000

50000

60000

70000

80000

90000

Linear Intensity

Relative Intensity

FEASA LED ANALYSER

INFRA RED VERSION

Setting Toleran e Limits for Peak Wavelength and Intensity

The test procedure requires the user to set the Pass/Fail limits for Peak Wavelength and

Intensity for each LED which then become the standard against which LEDs to be tested are

compared.

The Pass/Fail limits for Peak Wavelength are chosen, in conjunction with manufacturer’s

specifications, from measurements taken from a sample number of typical LEDs.

Sample Peak Wavelength Pass/Fail Limits

LED Minimum Maximum

830 820 840

880 870 890

900 891 910

930 910 950

Figure 2.

The Pass/Fail limits for intensity are chosen from the average intensity values from a number

of sample LEDs.

Sample Intensity Pass/Fail Limits on a single apture range. Eg C2

Intensity Value Upper Limit Lower Limit Comments

1250 1500 1000 Dim LED

25000 28000 22000 verage LED

60000 64000 56000 Bright LED

Figure 3.

Back to Index

FEASA LED ANALYSER

INFRA RED VERSION

Physi al Layout

Figure 4a (Front Panel).

Figure 4b (Rear Panel).

This shows the layout of the Connectors viewed from the edge of the board.

Figure 4a shows the physical layout of the Feasa x-IR / IRP nalyser Front Panels.

Figure 4b shows the physical layout of the Feasa x-IR / IRP nalyser Rear Panels.

These units are enclosed in a Red luminium Case. The Serial port is a 3 pin connector with

the cables supplied and the USB connector is the mini usb again the cable is supplied with the

unit.

Please refer to the Fixturing Guidelines Manual for onne tor pin out details.

USB Port Control

Connect the LED nalyser to the PC using the supplied USB cable.

Power is supplied through the USB Cable so there is no need to plug in the Power cable.

The installed Software Driver will configure the USB Port automatically.

The USB Port is configured as a Virtual Com Port and will be designated a name such as COM5,

COM6, etc.

Back to Index

D_IN

D_OUT

GND

POWER SUPPLY

FEASA LED ANALYSER

INFRA RED VERSION

Serial Port Control

For serial communications the LED nalyser must be connected from the 3-pin Serial

Connector to the PC or Controller using the supplied serial cable (L -SER-02).

5VDC @ 200m must be supplied to the 2-pin Power Connector using the Power Cable

provided (L -PWR-01). See figure 7. Prolonged Voltages > 7V can damage the Analyser.

The Green LED should turn on to indicate the nalyser is ready for use.

The default serial communications settings are 57,600 Baud, 8 Data bits, 1 Stop bit and

No Parity.

The baud rate can be changed to any of the following:- 9600, 19200, 38400, 57600, 115200.

See the setbaud command for more details.

Serial Connector (RS232C)

Pin Signal Pin on 9-Pin

D-type

1 Tx from LED nalyser 2

2 Rx from LED nalyser 3

3 GND 5

Power Connector

Pin No Signal

1 Power (5V DC)

2 GND

Figure 5.

Back to Index

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