Velleman DCA75 - Manual (Page 13)

Atlas DCA Pro User Guide December 2012 – Rev 1
Page 13
Bicolour LED (3 lead)
Common Cathode
#1: LED
#1: LED
Red-A Green-K
VF=1.935V at 5.00mA
#2: LED
Green-K Blue-A
VF=1.877V at 5.00mA
Bicolour LEDs (3-lead types)
3-lead bicolour LEDs are available in
common cathode and common anode
varieties. The DCA Pro supports both types.
In the same way as the 2-lead bicolour LED
analysis, each internal LED is detailed separately on the
DCA Pro screen.
The type of bicolour LED is shown
here, in this example we have a
common cathode variety.
The details for each internal LED are
then shown.
It can be seen here that our example has
its common cathode terminal connected
to the Green test clip.
Typical values of forward voltage for LED colours are shown here:
(LED types/manufacturers may vary significantly)
LED Colour Typical V
F
@ 5mA
Red 1.81V
Amber 1.86V
Yellow 1.90V
Green (standard type) 1.95V
Green (deep green / emerald) 2.84V
Blue (and white) 2.95V