Survey Tribrach Adaptor TPS Total Station And Gps Surveying
|Leica TPS Instruments
|Survey Instrument Accessory
Survey Tribrach Adaptor,
TPS Tribrach Adaptor,
TPS total station and gps surveying
Leica Type Green Tribrach without Optical Plummet for Survey Total Station GPS
· Suitable for TPS instruments with an angular accuracy of greater than 3".
· The footscrews have a large diameter which permits fine adjustment even when wearing work gloves.
1. Replacement of Leica GDF111-1 Tribrach
2. High quality features 3X magnification and a twist focus.
3. With locking forced-centering knob.
4. 5/8*11 base
5. 8-minute circular bubble
6. Large-diameter leveling screws
Suitable for TPS instruments with an angular accuracy of greater than 3". The footscrews have a large diameter which permits fine adjustment even when wearing work gloves. Torsional stiffness <3", weight 780 grams
A tribrach is an attachment plate used to attach a surveying instrument, for example a theodolite, total station, GNSS antenna or target to a tripod. A tribrach allows the survey instrument to be repeatedly placed in the same position over a surveying marker point with sub-millimetre precision, by loosening and re-tightening a lock to adjust the instrument base in a horizontal plane.
What is the accuracy of a tribrach?
The accuracy with which a tribrach returns to its starting position once the instrument has stopped, is called torsional rigidity or hysteresis. This hysteresis is the relative movement between the top plate and the base plate of a tribrach that occurs through the rotation of a TPS instrument.
Why does a tribrach need to be adjusted?
The precise alignment of the support area to the base plate of the instrument assures extremely accurate forced centring. The optical plummet is so robust that the need for adjustment during the entire lifetime of the tribrach is practically unnecessary.
How big are the foot Screw on a tribrach?
The hysteresis of the Professional 3000 Series tribrachs amounts to a maximum of 3" (1.0 mgon). The foot screws are maintenance-free and have a larger diameter.
Detailed Pictures for Reference