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LED Spectrophotometer Operating Procedure

Document No#: ICM37-013

Rev: NC

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SPECIFICATION HISTORY

_____________________________________________________________

DESCRIPTION OF NOTICE ECN # DATE REV.

FIRST ISSUE 10/26/11 A

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1. Purpose

1.1. To measure LED electrical and photometric parameters.

2. Scope

2.1. Electrical parameters measured are forward voltage, forward current, andpower. Photometric parameters measured, between 300nm to 1000nmwavelength, are luminous flux (lumens), efficiency, efficacy, CIE x, CIE y,u', y', and color rendering/ temperature.

3. References

3.1.LM80

3.2. Energy Star Solid State Lighting (SSL) Luminaries

4. Definitions

4.1. N/A

5. Equipments / Materials

5.1. Labsphere spectrophotometer, model TOCS20.

5.2. Standard lamp for system calibration, SCL-600.

5.3. LED test fixture, to accurately position the LED panel for measurement.

5.4. Relay multiplexer, to supply LED power via a LabView program.

6. General Requirements

6.1 LEDs are to be tested at room temperature.

7. Test Conditions

7.1. All test will be done at room temperature.

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8. Procedures

8.1. Turn on computer.

8.2. Click the TSCO icon on the computer desktop and follow instructions on

the screen until the following window shows up.

8.3. From the menu bar, click Tools then select LED Power Supply

8.4. The following window will appear.

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8.5. Toggle Source Mode to Current8.6. Set Volts, Amps according to the LED specification.8.7. Set Soak Time (ms), and Integration Time (ms) to the test

specification.8.8. Set "Volts" a few volts higher than the LED forward voltage specification.8.9. Set "Amps" to the exact same current level of the LED specification.8.10. Set "Soak Time (ms)" to 10ms if not specified from the customers.8.11. Set "Integration Time (ms)" to the customer requirement. If no

requirement is given, set the initial value to 10ms, proceed with the test.8.12. Turn on the crossed hair laser which has been adjusted to aim the laser

beam at the center of the integrating sphere aperture. If adjustment isneeded, call an engineer or qualified technician to perform theadjustments.

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8.13. Attach the LED panel to the opposite side of the dummy panel as shownin the picture below and connect the cable to the top and bottom of theLED panel.

Panel for optometric measurement

Dummy Panel

Top Connector

Bottom Connector

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8.14. Push the dummy panel all the way in as shown in the picture below

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8.15. Gently swing the panels until the LED panel lightly touches against thesphere aperture then lock the arm in place by tightening the locking knob.

Locking Knob

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8.16. Pull the dummy panel outward from the sphere aperture to allow thepanel to move freely without touching the sphere aperture.

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8.17. To align the proper LED for testing, move the panel in a up-downdirection by turning the hand wheel, slide the panels side way by handuntil the desired LED location is pointed by the crossed hair laser.

8.18. Connect the LED power by selecting/clicking the proper LED button onthe switch matrix computer screen, as shown below.

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8.19. Click "Start Soak Test" button in the LED power supply screen.

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8.20. The following test information window will appear. Enter the properinformation into the fields. Click OK to start test.

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8.21. After testing is done, the following light spectrum is shown. Notice thatthe upper middle green bar is close to half way mark. If the green bar isbelow the half way mark, increase the Integration Time in step 8.11. Ifthe green bar turned red, decrease the Integration Time in step 8.11.

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8.22. Repeat step 8.17 to 8.20 until all LEDs in the panel are tested.8.23. Click Save Data to save the captured data into Labsphere internal

database.8.24. Click "Tool", then "Analyze Data".

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8.25. Click "DATA #1". The following screen will appear.

Each row represents the data gathered for each LED during test.To export the data into a csv formatted file, enter the proper rownumbers in "Start Entry" and "Stop Entry", then click "Selected" buttonto generate the file.

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8.26. Select folder and enter the file name to save the tested panel test data.

8.27. The saved file will be use to create the appropriate report for thecustomer.

9. Failure Criteria

9.1. N/A

10. Responsibilities

10.1. Engineer should calibrate the system with standard light source (SCL-

600) every quarter and record in the log file.

10.2. The operator or technician must perform zero or dark-current calibrationbefore each lot measurement.

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P i t d C i U t ll d

10.3. After each dark current calibration, check the lumen output reading withcontrol LED units. The readings should be within +/-2 % of the controlledunits. Inform engineer if the reading is over +/-2%.

11. Quality Records

11.1. Maintain Quality Records as per specs GCA22-002.