# To adjust a Trimble S series or VX instrument

These steps apply to any Trimble servo or robotic instrument connected to the controller, except a Trimble SX10 or SX12 scanning total station.

If you are connected to a mechanical Trimble total station, you must adjust it using the control panel on the instrument.

1. Set up the instrument on a stable surface.
2. Make sure that the instrument is accurately leveled and that the compensator is enabled.

3. Tap and select Instrument / Adjust.

   The procedures available in the Adjust screen depend on the connected instrument.

4. Perform each adjustment in turn, using the steps below.

Collimation and trunnion axis tilt

On a Trimble total station, you must perform the HA VA collimation and the trunnion axis tilt adjustments together.

Final collimation values must be within tolerance of standard values. If not, the instrument needs to be adjusted mechanically. For more information, contact your local Trimble service provider.

1. Position the instrument as follows:

   - For HA VA collimation, the instrument must be at least 100 m from the target and the angle to the target must be less than 3° (3.33 gon) from the horizontal plane.
   - For trunnion axis tilt, the angle to the target must be at least 30° (33.33 gon) from the VA measured during collimation.

2. Select Collimation & Trunnion axis tilt.

   Current adjustment values for the instrument are shown.

3. Tap Next.

4. Aim at the target and take the collimation measurement.

   Do not use Autolock during collimation or trunnion axis tilt tests.

   You must take a minimum of one observation on each face. If you take more than one observation, complete all observations on face 1 first. Between each observation, turn the instrument away and then re‑aim.

5. To change face, tap Chg face and observe the same number of observations on face 2 as you observed on face 1.
6. When the number of observations is the same for both faces, tap Continue.

7. Aim at the target and take the trunnion axis tilt measurement in the same way you took the collimation measurements.

   The current values and the new instrument values are shown.

8. Tap Accept.

Autolock collimation

Autolock collimation should be performed after the HA VA Collimation adjustment, if available, has been completed.

1. Select Autolock collimation.
2. Ensure that there are no obstructions between the instrument and the target, which should be at least 100 m apart.

3. Follow the prompts. Press the keys lightly to avoid bumping the instrument.

EDM constant

1. Select EDM constant.
2. Tap Next.
3. Enter an appropriate EDM constant. The available range is ‑9.99 mm to +9.99 mm.
4. Tap Store.