The result of the calculation (analogue value with unit and decimal
places of the selected function quantity for Z)
➢ The intermediate values between the defined points are interpolated by the function.
Plan view of a single element of a 3D plot to explain the interpolation of a point between
defined Z values:
To calculate the Z value, firstly the 2
average values between P1 and P2 (z12)
and P3 and P4 (z34) are calculated. Those
two average values z12 and z34 are then
averaged in turn and the resulting value is
issued as the Z output variable.