Request InfoKeithley Instruments Inc.Keithley Instruments Inc.'s model 2520 is a light intensity-current-voltage test system for the electrical characterization of laser diodes in the chip or bar state or in finished modules. The company says the single-instrument system can test laser diodes in pulse mode up to 5-A peaks. Besides its pulsed current output, the device has three measurement channels, one of which measures voltage across the laser diode. 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