Target control settings

Configure settings for locking onto targets in the Target controls screen.

To access the Target controls screen, tap the Instrument icon in the status bar and then tap and hold on the Autolock, FineLock, LR FineLock or Search button.

The fields shown in the Target controls screen depend on the selected Target lock method and the connected instrument.

Select the method for locking onto the target. See Enabling Autolock, FineLock or Long Range FineLock.

Select Snap to target to automatically lock on to a remote target if one is detected.

If the instrument is fitted with the FineLock lens aperture accessory, select Using FineLock lens aperture to lock onto and measure to a prism less than 20 m away.

Select Autosearch to automatically perform a horizontal search when lock is lost to a remote target.

The LaserLock method streamlines the process of locating a prism in dark environments by enabling the laser pointer and then using Autolock to lock to the target when measuring. When the Laserlock checkbox is enabled, measuring to the prism automatically disables the laser and switches Autolock on. When the measurement is complete Autolock is switched off, and the laser is switched back on ready to help locate the next prism.

Use the Predictive tracking time setting to pass behind a temporary obstruction and have the instrument continue to turn, based upon the target's horizontal trajectory, when lock to the prism is lost.

If the trajectory is consistent and the prism re‑appears from behind the obstruction within the defined Predictive tracking time interval, the instrument will be aimed directly at the prism and lock is automatically regained.

If the prism does not reappear after the specified time interval, the software reports that the target is lost and then takes corrective actions based on the current settings. The instrument turns to where the target was last seen and then acts as follows:

  • If Autosearch is On and the Autolock method is set to Snap to target, the instrument locks on to any target in the field of view.

    If there is no target, a search starts based on your search window settings

  • If Autosearch is On and the Autolock method is set to Snap disabled, the instrument ignores any visible targets and starts a search based on your search window settings.

  • If Autosearch is Off and the Autolock method is set to Snap to target, the instrument locks on to any target in the field of view or waits until a target comes into the field of view and then locks onto it.

  • If Autosearch is Off and the Autolock method is set to Snap disabled, the instrument ignores any targets in the field of view and does not start any search until you prompt it to do so.

  • For standard robotic usage, Trimble recommends the default setting (1 s).

    This enables you to pass behind anything small blocking the line of sight between the instrument and the target (for example, trees, electrical posts, or vehicles) and then automatically regain lock.

  • In environments with a number of reflective objects, you could set the predictive tracking time to 0s. For optimal performance, use this setting with Snap to target DISABLED.

    With these settings, you are immediately informed if the line of sight to the correct target is obstructed. You can then ensure that you regain lock to the correct target.

  • In environments where your target may be blocked for a few seconds at a time, you can use settings of 2 s or 3 s.

    This enables you to pass behind larger objects blocking the line of sight between the instrument and the target (for example, small buildings) and then automatically regain lock.

If the instrument fails to regain lock onto the moving target, it returns to the location where it first lost lock and the predictive tracking began.

The search window settings control the size and center of the window the software uses when searching for targets.

Select Autocentered search window to use the current horizontal and vertical angle of the instrument to set the center of the search window, and the horizontal and vertical range to calculate the extents of the window. These extents are sent to the instrument each time it performs a search.

If the Autocentered search window check box is not shown, then the software behaves as if the check box is selected.

To configure the top left and bottom right extents of the search window:

  1. Clear the Autocentered search window check box.
  2. Tap Set win.
  3. Aim the instrument to the top left corner of the search window. Tap OK.
  4. Aim the instrument to the bottom right corner of the search window. Tap OK.

FineLock technology locks onto targets only when they are within the FineLock sensor area. If the intended target cannot be found, FineLock 'auto‑gain' increases slightly to attempt to find other nearby targets. However, this may not always be desirable.

The FineLock tolerance window limits the range that FineLock technology moves when trying to lock onto nearby targets. Targets outside this range are not locked to and the software reports a target outside the defined tolerance was found.

The FineLock tolerance window you can configure is defined as a half window, where the maximum half window size is 4 mrad (13' 45"), which is the smallest separation allowed between targets when using FineLock technology.

To configure the FineLock tolerance window, tap Adv, and then configure the FineLock tolerance window Horizontal range and Vertical range.

To use a GPS/GNSS receiver to help point the instrument when searching for targets, see GPS Search.

If the measurement is likely to be interrupted, for example, when measuring in traffic, enable Interrupted target measurement and enter the Interrupt timeout value. See Interrupted target measurement.