Welch Allyn CP50 - Quick Reference Guide - Manual (Page 5)

AHA IEC Location
I RL
(green)
N
(black)
Just above the right ankle.
J RA
(white)
R
(red)
Just above the right wrist on the inside of the arm.
CP 50™ and CP 50 Plus™ 12-lead resting electrocardiograph 5