NIST welcomed delivery of the Vektrex-developed automated burn-in/light measurement system. White light LEDS from four different manufacturers have been sealed inside the special integrating sphere to begin 5 years of fully automated continuous testing. Each group of 120 devices will 480 3W white light LEDs from four different manufacturers will be tested at three different temperatures; 55C, 85C and 115C – using three different heat sink configurations. Some LEDs will remain illuminated and some will be switched on and off. The CAS-140 sealed inside the sphere will periodically measure each individual device light output, providing information about how luminance changes over time. A digital camera installed at the bottom of the sphere will constantly monitor the entire array, providing a time stamp marker when individual LEDs fail.
Vektrex SpikeSafe DC / Continuous Pulse multi-channel current source was selected for the reliability test based upon the pulsed capabilities and reliability. Developed for reliability applications, the SpikeSafe MTBF (Mean Time Between Failure) supports completing the test without failures and unplanned maintenance.
SpikeSafe Performance Series pulsed current source was selected for light measurement based upon the precision pulsing. Single pulse mode is employed for repeatable light measurements.
Follow this link to access the “LEDs Get a Life Sentence” article.
Email info@vektrex.com for more information about this system or other Vektrex LED and laser diode reliability and light measurement systems.
