With Enzo and Hirata-san.

We calibrated the top filter fishing rod with respect to the LVDT readout. See spreadsheet attached.

• Displacement per step: 6.18×10^-4 µm/step.
• Keystone displacement
  • Maximum: 885 µm.
  • Minimum: -1299 µm.
  • Total range: 1984 µm.
• Stepper motor displacement
  • Maximim: 2,650,000 steps at 102.0 mm from the physical reference (aluminium plate on top of motor).
  • Minimum: -500,000 steps at 39.7 mm from the physical reference.
  • Mid-range: 1,100,000 steps at 70.85 mm from the reference.
  • Total range: 3,150,000.
• The particular values of the maximum and minimum displacement of the stepper motor (in number of steps) will change when the driver is re-started, nevertheless, the total range is not expected to change.
• In the mid-range of the stepper motor position the LVDT readout is -167 µm.
• Just for reference, the F0 LVDT calibration plot is in entry 5529.