[Elecraft] KX3/KX2 voltage display

[E T]

When using the special VFO B display to show the supply voltage, both my KX3 and KX2 disagree with the rest of my equipment.  The radios consistently are 0.2V - 0.4V lower than my inline meters and my Fluke when measured at my RigRunner distribution block and at the end of a cable (e.g. if I disconnect my PX3).  I don’t see any way to calibrate this, is this expected?

  Thanks and 73,
  Erik Tkal  -  W1QED