Feasa S2 Manuale utente

Feasa LED Spectrometer

User Manual for Feasa S2 Spectrometer

Feasa Enterprises Ltd,

Holland Road,

National Technology Park,

Castletroy, Limerick, Ireland.

www. easa.ie

Email: sales@ easa.ie

Rev. 1.4

Date: November, 2020

Feasa LED Spectrometer

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 LED Spectrometer version S2.

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

manual may e 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 een made to ensure that the information in this manual is accurate. Feasa

Enterprises Limited is not responsi le for printing or clerical errors.

Feasa LED Spectrometer
Ta le of Contents
About this Manual...................................................................2
Introduction...........................................................................6
Sa ety Instructions..................................................................7
Physical Layout.......................................................................8
Power Requirements:...............................................................8
USB Port Control..................................................................9
Serial Port Control (RS232)....................................................9
Trigger Port Control............................................................10
Connecting the Patch Cord to the Spectrometer.........................11
Spectrometer Block Diagram...................................................12
Spectrometer Front End So tware............................................13
Spectrometer De initions........................................................14
Peak Wavelength................................................................14
Dominant Wavelength.........................................................15
Correlated Colour Temperature CCT......................................16
Luminous Flux – Lumen (lm)................................................17
Luminous Intensity -Candela (cd).........................................18
Luminance – Candella per m2 (cd/m2)....................................19
Command Structure...............................................................20
Capture - Capture LED Wavelength and Intensity Data............21
Capture####### - Capture LED Data  or a speci ic Integration 
Time.................................................................................22
CC – Capture LED Data  or a predetermined Integration Time.. .23
Get Data Commands..............................................................24
GetAverage - Get the number o  readings that are averaged. . . .25
getCaptureTime - Get the LED Capture Time..........................26
getSIGNALLEVEL - Intensity as a percentage o  the Range.......27
getCCT - Get Correlated Color temperature............................28
getDominantWavelength - Get the Dominant Wavelength.........29
getGAI - Get the Gamut Area Index o  the Led.......................30
getLuminousFlux - Get the Lumen value................................31
getLuminousIntensity - Get the milliCD value.........................32
getLuminance - Get the cd/m2 value......................................33
getPeakWavelength - Get the Peak Wavelength......................34
getPower - Get the Radiant Power o  the LED.........................35
3

Feasa LED Spectrometer
getSpectralWidth - Get the Spectral width o  the Led...............36
getxy - Get the xy Chromaticity o  the Led.............................37
get1960uv - Get the CIE 1960 uv Chromaticity o  the Led........38
get1976uv - Get the CIE 1976 u'v' Chromaticity o  the Led.......39
getSPD - Get the Spectral Data o  the Led..............................40
getCRI - Get the Colour Rendering Index o  the Led................41
getCQS - Get the Colour Quality Scale o  the Led....................42
getBAUD - Get the Baud Rate...............................................43
IMPORTANT INFORMATION  or Programmers.............................44
Set Commands.....................................................................45
Setcustomtime####### - set a speci ic Integration time.......45
SetPWM# - Enable/Disable PWM capture mode.......................46
SetAverage### - Set the number o  readings to average........47
SetWaveRangeMin###.## - Set minimum wavelength...........48
SetWaveRangeMax###.## - Set maximum wavelength..........49
SetWaveResolution#.# - Set the wavelength resolution...........50
setBAUD - Change the baud rate..........................................51
Command Summary..............................................................52
External Trigger Mode:...........................................................53
EnableTrigger – Enable the Trigger Function...........................53
DisableTrigger – Disable the Trigger Function.........................53
SetTriggerTime##### – Set the Trigger Integration Time.......54
GetTriggerTime – get the Trigger Integration Time..................54
SetAverage01 – Set the number o  measurements to 1............55
GetAverage – get the number measurements to be averaged. . .55
Measurement Sequence.......................................................56
Trigger Error Messages........................................................56
Daisy Chain Setup:................................................................57
Connecting the Patch Cord to the Spectrometer......................57
Setup Spectrometer No 1 / Master........................................61
Setup Spectrometer No 2 / Slave No 1..................................64
Setup Spectrometer No 3 / Slave No 2..................................67
Summary o  Setup Procedure...............................................70
Operating the S2 Spectrometer in Daisy Chain Mode:.................71
Capture Dark.....................................................................71
Capture the Bus.................................................................72
4

Feasa LED Spectrometer
Retrieving the Data.............................................................72
Speci ications........................................................................75
Ordering In ormation.............................................................76
Error Messages.....................................................................77
OverRange........................................................................77
UnderRange.......................................................................77
Error: light signal not stable.................................................77
Timeout Occurred...............................................................77
Capture Dark Error.............................................................77
Warranty..............................................................................78
5

Feasa LED Spectrometer

Introduction

The Feasa Led Spectrometer is a single channel instrument that has been designed

speci ically to allow testing o LEDs on populated PCB’s where access is limited and to measure

LEDs in a Laboratory.

The Feasa Led Spectrometer includes customised on board irmware or automatic colour

calculation in multiple colour spaces. It uses a similar easy-to-use set o commands as the

Feasa Led Analyser.

The Spectrometer can be supplied with miniature Integrating Spheres, Luminance Heads and

Millicandela Heads which are used to measure LEDs mounted on Printed Circuit Boards. The

adapters allow single LEDs to be measured on a PCB.

When your quality demands Traceable Measurements, the Feasa Led spectrometer provides an

ideal solution. Traceable measurements can be obtained or Luminous Flux (Lumens),

Luminous Intensity, Luminance and Wavelength.

The Feasa Led Spectrometer is compatible with all Feasa Led Analysers to ensure production

setup meets customer requirements. LED test and measurement unctions have been

incorporated into the Spectrometer so that minimum data processing is required.

A USB inter ace is included in the device or computer access. Power or the Spectrometer is

derived rom the USB Inter ace. The USB Inter ace is 2.0 compatible. The Spectrometer is also

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

compatible with the RS-232C ports on machines. An external 5V @200mA PSU is required or

this.

Back to Index

Feasa LED Spectrometer

Safety Instructions

Sa ety precautions should be implemented when testing LEDs. Care should be taken to avoid

adverse e ects on the human eye caused by light stimulation.

Eye protection should be worn especially when testing high power LEDs.

Never look directly into the optical parts or ibers since light can be coupled rom the other

end.

Back to Index

Feasa LED Spectrometer

Physical Layout

Figure 1a (Front Panel).

Figure 1b (Rear Panel).

This shows the layout o the Connectors viewed rom the edge o the board.

Figure 1a shows the physical layout o the Feasa S2 Led Spectrometer Front Panels.

Figure 1 shows the physical layout o the Feasa S2 Led Spectrometer Rear Panels.

These units are enclosed in an Aluminium Case. The Serial port is a 3 pin connector with the

Serial and Power 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 connector pin out details.

Power Requirements:

I the USB Inter ace is used then the Spectrometer will draw its power rom the USB Port on

the Computer. The Power requirements or the Spectrometer when using the Serial Port

Communication are 5V DC @ 200mA. Do NOT Exceed 6.5V as this will damage the

Spectrometer.

Back to Index

D_IN

D_OUT

GND

POWER SUPPLY

Feasa LED Spectrometer

USB Port ontrol

Connect the LED Spectrometer 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 So tware Driver will con igure the USB Port automatically.

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

COM6, etc.

Serial Port ontrol (RS232)

For serial communications the LED Spectrometer must be connected rom the 3-pin Serial

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

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

provided (LA-PWR-01). See igure 3. Prolonged Voltages > 6.5V can damage the

Spectrometer. The Green LED should turn on to indicate the Analyser is ready or use.

The de ault serial communications settings are 57,600 Baud, 8 Data its, 1 Stop it and

No Parity.

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

See the setbaud command or more details.

Serial onnector (RS232 )

Pin Signal Pin on 9-

Pin D-type

1 Tx rom LED Analyser 2

2 Rx rom LED Analyser 3

3 GND 5

Figure 2.

Power onnector

Pin No Signal

1 Power (5V 200mA DC)

2 GND

Figure 3.

Please Ensure the RS232 GND (pin3) and the PSU GND are connected together.

Back to Index

Feasa LED Spectrometer

Trigger Port ontrol

The Feasa Led Spectrometer includes a Trigger unction that allows an external signal to

trigger a capture. For Trigger Function to operate the LED Spectrometer must be connected

rom the 2-pin Trigger Connector (Figure 4) to the PC or Controller using the supplied serial

cable (LA-TR-01). The Trigger unction must irst be enabled by sending commands to the

Spectrometer. The capture is triggered by a high-to-low transition on the Trigger Pin. See the

External Trigger Mode section o this manual or the programming details.

Figure 4.

The layout o the Trigger Connector is shown above Figure 4. The trigger is activated on the

Trigger Pin. This pin has an internal pull-up resistor to 3.3V. The Trigger is activated by

driving this pin to GND. The Trigger timing sequence is shown below in igure 5.

Figure 5. Trigger Timing

When the Trigger is activated there is a 1.5ms +/- 0.1ms delay be ore the light capture begins. The

commands must be transmitted through the USB or Serial Port o the Led Analyser. The Feasa Terminal

program can be used to per orm this task.

Trigger onnector

Pin Signal

1 Trigger Pin

2 GND

Figure 6.

Back to Index

Trigger Pin GND Pin

Trigger

Measure 1.5 s

3.3V

Integration

Ti e

Indice

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