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The pulse picker spindle comes pre-aligned out of the box. Should you wish to re-align the spindle to the beam path (essentially, computing an adjustment to the current Mo calibration), you will need to follow these steps:

  1. If the picker is not already aligned in X and Y, do that alignment first.
  2. Home the spindle using the pulse picker interface (mode 7).
  3. Open the pulse picker using the GUI.
  4. Ensure that you have a way of shining light through the picker, and a way of detecting it.

  5. Now, start to nudge the picker spindle in the positive direction by entering into the expert command box, followed by <Enter>:

     1MR 5

    In this command, 1MR is the command for "move relative", and 5 is the number of steps to move from the current position. You can enter any number of steps for this command. You can also enter -5 if you want to move in the negative direction.
    The objective in this step is to move the spindle to the point where it just interrupts the light. Once the spindle is there, record the current position in motor steps, which is on the expert interface as C1 (click it to refresh). Let this number be X.

  6. Nudge the pulse picker spindle in the negative direction by issuing 

    1MR -5

    ...until the spindle again just interrupts the light. Record the current motor position C1, and call this number Y.

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