FineLock or Long Range FineLock

Some Trimble instruments provide FineLock and Long Range FineLock technology for better performance when measuring to static targets when there are two prisms close together. FineLock does not follow a prism when it’s moving.

Use:

  • FineLock to lock onto and measure to a prism 20 m–700 m away when there are multiple prisms close together.

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

  • Long Range FineLock to lock onto and measure to a prism 250 m–2500 m away.

NOTE – The separation between targets should not be less than 13' 45" (4 mrad).

CAUTION – The software warns if the distance to the prism is outside the supported range and prevents the measurement from being taken. However, if the software is unable to measure the distance, for example when measuring angles-only measurements, the software cannot display a warning message and will store the measurement. Measurements taken to prisms outside these ranges when FineLock or Long Range FineLock is enabled are unreliable and should not be used.

FineLock and Long Range FineLock technology always take precedence over TRK, DR, or Autolock modes and cannot be used at the same time. If you enable FineLock or Long Range FineLock technology, then Autolock or GeoLock is automatically disabled. If you enable FineLock or Long Range Finelock when TRK or DR mode is enabled, the observation is measured with STD mode.

Enable FineLock from the Target controls screen or the Instrument Functions screen. For more information on enabling FineLock, see Enabling Autolock, GeoLock, FineLock or Long Range FineLock.

NOTE – The Long Range FineLock hardware is not coaxial with the telescope. To eliminate the vertical errors associated with non‑coaxial Long Range FineLock hardware, you must observe all observations to points on both face 1 and face 2.