[Elecraft] K3 voltage indicator

[G4FNL]

Folks

I suspect that may have been asked before, so forgive me if it has, but I
need to know what the typical voltage readings are observed (on the K3
voltage indicator) when 
a) On receive?
b) With say 10w TX power?
c)  With 100W TX power?

Using a DMM, I can see that my 13.8volt linear PSU seems to drop 0.1volt
when going from receive to the 100W TX level - yet the  display indicator on
the K3 goes from 13.7v (receive) to 13.3v (10W) to 12.9v (100W) Is this
typical?

73 Graham G4FNL