Single Pulse LED Measurement System for LED Binning

May 3, 2012 - PRLog -- Slight differences in LED characteristics can occur as a result of mass production. Sorting the LEDs into bin classes based on luminous flux and color properties provides a means of cataloging them. The LED manufacturer may do the binning or the party implementing the LEDs may self-bin them. For higher efficiency processing the LED is normally operated and measured in single pulse mode at a few millisecond long pulse width at a specified operating current.
     Both meter, power supply and control software work in tandem to drive and measure the test LED in single pulse mode and record the results.
The BTS256-LED Tester is a compact measurement device designed for high accuracy measurement of luminous flux, spectral and color data of single assembled and unassembled LEDs in the visible spectrum. The BTS256’s bi-technology light sensor offers a fine photometric response photodiode for accurate wide dynamic range flux detection. Along with the integral detector a compact low stray light spectrometer is installed for spectral color measurements. The Bi-Tec sensor photodiode operates in fast data logger mode with 1ms sampling rate which can be used for pulse form profiling measurements. The BTS256-LED is powered through its USB adapter when connected to PC.
    The LPS-20-1500 is a microprocessor-based current and voltage source especially designed for the operation of LEDs and other semiconductor light sources requiring low noise. The LPS20-1500 operates up to 1500mA with 30μA resolution and up to 24V with 0.5mV resolution. It is set-up for full remote control operation in CW or single pulse operation mode. Either current or voltage can be measured with high 16bit ADC resolution. Its I/O interface supports trigger-in and trigger-out operation in flash mode.
     The S-BTS256-LED software supplied supports the set-up of the measurement device and source and the synchronized measurement.    
Calibration and certification of the BTS256-LED tester is performed in Gigahertz-Optik’s ISO 17025 accredited optical radiation calibration laboratory.