Voltage Offset Value

[Monkeymerlot]

Description:
When the voltage is amplified outside of the AFM, it can have some offset value that is not exactly zero due to imperfections in the voltage amplifier. @jlevylab has reported that when the tip is moving/set to zero, or otherwise when the value should be zero, it is actually a slightly negative value. This could be rectified with a control in the driver UI similar to the amplification value in the driver UI that could be set based on a result of a testing procedure designed to measure the offset in a consistent way.

Considerations:
Do we change the output value for before or after we do the math to account for amplification? So say that we see a 2.5 V offset after amplification. Is the value that we want to set for the offset -2.5 V or -0.1 V?
Is the offset constant at all voltages? Do we still see an offset if we were to input 10 V (ie an insane output of 250 V). Does this even matter considering we use 25x amplifiers, so the max change in the AFM output voltage would be +/- 1 V that I can foresee. Furthermore, at high voltages, would it even matter because a -0.1 V offset at 250 V is still 249.9 V.
Finally, is it an offset in the controller from Asylum, or is it caused by the voltage amplifier itself?