Leds – Velleman DCA75 User Manual
Page 11
Atlas DCA Pro User Guide
December 2012 – Rev 1
Page 11
LED
Red-K Blue-A
VF=1.962V at 5.00mA
LEDs
An LED (light emitting diode) is really just another type of
diode, however, the DCA Pro will determine that an LED or
LED network has been detected if the diode’s measured
forward voltage drop is larger than 1.5V. This also enables the
DCA Pro to intelligently identify bicolour LEDs, both two-lead
and three-lead varieties. See the section on bicolour LEDs for more
information.
For two leaded parts, connect any pair of the 3 test clips to your LED. Leave
the 3
rd
lead unconnected.
In this example, the Red test clip is
connected to the LED’s Cathode
(negative) and the Blue test clip is
connected to the Anode (positive).
The forward voltage of the LED is measured at a nominal current of 5mA.
During the analysis process, the LED will briefly illuminate (so you
can see it’s illumination colour). The test current of 5mA means that it
may not be as bright as you expect, LEDs are often used at currents of
10-20mA. Power LEDs are sometimes driven at 350mA or more.