[Elecraft] K3 voltage reading

[Steve Ellington]

Can someone take a look at their voltage reading on their K3's DISP-V window and tell me what they get with key down, full power output into 50 ohms? 
My PS shows 13.7v at it's terminals and the K3's display indicates 13.1v. I'm just wondering if there is excessive voltage drop on the power leads. I'm using the factory cable. I'm not sure if the K3 is indicating the voltage at rig's connector or the voltage on the final amp. transistors. 

Steve N4LQ