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                                               Number 3212
                A Tektronix Company




Application Note                               Avoiding Inrush Current when Testing High
           Series                              Power LEDs with Series 2260B Power Supplies

Light-emitting diodes (LEDs) are quickly becoming an attractive       the device is instantaneously a short circuit when a voltage is
lighting source due to a variety of benefits they offer over the      applied across the device's terminals. The instantaneous short
traditional incandescent and fluorescent light bulbs. LEDs            circuit results in an inrush current , a short duration, startup
have a very long lifespan; they are highly efficient with very        current that is a much greater magnitude than the LED's steady
low power consumption; they do not contain mercury and are            state operating current. For
environmentally friendly.                                             example, introducing an LED to an
                                                                                                                      +
     Unlike an incandescent bulb where the lighting source is         energized circuit or "hot switching"
                                                                                                               Power
a filament made of a resistor that lights up when heated, an          the LED will lead to dangerous          Supply
                                                                                                                                   LED
LED is a two-terminal, semiconductor device that emits visible        inrush current magnitudes. The                  

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