LED Measurement – StellarPro Quick Start
- Turn on the computer. Open the StellarNet software by double clicking on the desktop icon StellarPro
to open the application.
- When you first open the software, you should see a screen similar to the one below:
- Turn on your LED or device to be tested.
- Select the Scope tab in the Graph window. This will show you the raw signal. You should see a spectrum of counts versus wavelength.
- Set the integration time so that your spectrum is not saturated but as close to 65,000 counts as possible. Enter the desired time in the integration time input box, then click on the “Int Time (ms)” button next to the input textbox to apply the entered time. The goal is to maximize your signal in SCOPE mode. You want to adjust your integration time until the spectrum fills most of the SCOPE graph (65,000) without saturating. This is also the point at which you should adjust the number of scans to average (more scans averaged will increase accuracy, but will take more time for each reading). You can also add smoothing controls at this time in the Device Settings block. A pixel box car set to 3 and averaging set to 5 often gives nice results.
- In the first picture below, the spectrum is correctly optimized to be just below the saturation limit (65,536 counts).
- In the second picture below, the spectrum have a flat line on the top, indicating the need to reduce the integration time.
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- Now, cover or turn off your LED. Left click on the Dark Reference button in the toolbar at the top right of the screen. You will see your baseline drop to zero.
- Click on Radiometer
in the Application modes to see your LEDs spectral curve and power output and CIE Color Measurement. Click on Colorimeter 
in Application modes for more colorimetric values.
| Warning: If your system saturates at all integration times or you need to reduce your exposure time <15ms to get a signal, then you must use a CR2-Aperture (CR2-AP) or inline neutral density filter to reduce light intensity to your system’s detector. There are other possible solutions as well. Please contact a StellarNet technical sales associate to choose which solution is best for your application. For Radiometric applications it is recommended to use exposure times >15ms. |
Tags: Application, Software
