1. Turn on the computer. Open the StellarNet software by double clicking on the desktop icon SpectraWiz to open the application.
2. When you first open the software, you should see a screen similar to the one below:
3. Turn on your LED or device to be tested.
4. Click on the Scope icon. This will show you the raw signal. You should see a spectrum of counts versus wavelength.
5. Set the integration time so that your spectrum is not saturated but as close to 65,000 counts as possible. Click on the integration time icon 
(and type in a value between 1 and 1000 ms) or use sliding scale 
. In the picture above, the spectrum is correctly optimized to be right below the saturation limit (65,536 counts). If a portion of the spectrum is off the screen, reduce the integration time. A signal with a flat top indicates that you are saturating the detector and should decrease your integration time. If you do not see any signal increase your integration time until you do.
6. In SCOPE mode choose your favorite settings such as spectral smoothing controls or samples to average. A pixel box car set to 3 and averaging set to 5 often gives nice results.
7. Now, cover or turn off your LED. Wait several collection cycles and hit the dark light bulb icon 
in the toolbar at the top of the screen. You will see your baseline drop to zero.
8. Click on Watts mode to see your LEDs spectral curve and power output. Click CIE Color Measurement icon 
or from the Applications Menu to see 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. |