Motorised Threaded Pole Adapter GDF311 Survey Tribrach Without Optical Plummet

Place of Origin China
Brand Name Leica
Certification ISO
Model Number GDF311
Minimum Order Quantity 5 Pieces
Price 40USD~50USD
Packaging Details Box and Carton
Delivery Time 5~8 Tribrach
Payment Terms T/T
Supply Ability 500pcs per month
Product Details
Brand Leica Condition New
Color Green Weight 780g
Torsional Stiffness <3" Optical Plummet No
Used For TPS Leica Instruments Catagory Survey Instrument Accessory
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Product Description

Original Leica GDF311 Tribrach w/o Optical Plummet

Model: GDF311



Torsional stiffness <3", weight 780 grams



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.


The hysteresis of the Professional 5000 Series tribrachs is guaranteed to a maximum of 1" (0.3 mgon) or better. The foot screws are maintenance-free and ensure a movement that is smooth and free of play, even in the most severe environmental conditions. The tribrachs in this series are recommended for all tasks that require angle measurements of under 3". Due to the minimal hysteresis, we recommend use of the Professional 5000 Series for all motorised instruments.



Similarly to the stability of the tripod, that of the tribrach is a significant factor in measurement accuracy. The torsional rigidity, the most important criterion of a tribrach, is constantly controlled and tested during its production. The maintenance-free foot screws of the Leica Geosystems tribrach provide movement that is always smooth and free of play, even after years of use. 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. Its construction predestines the tribrach for all applications, including extreme temperatures and high dust and humidity.

The torsional rigidity of the original
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. The hysteresis has direct influence on the angular accuracy of the instrument – and that speaks for the original. To optimise the hysteresis as Leica Geosystems has done is complex and calls for the highest precision: a movement of the upper plate to the lower plate of 0.3μm corresponds to an angle error of 1”. Especially motorised instruments with their high acceleration and brake power require tribrachs with very high torsional rigidity.

The ideal tribrach for your application
All original tribrachs comply with the strict specifications and quality standards of Leica Geosystems. Your choice should ideally be made according to your ­individual accuracy requirements.

Professional 5000: Hysteresis maximum of 1" (0.3 mgon) or better
Professional 3000: Hysteresis maximum of 3" (1.0 mgon)
Professional 1000: Hysteresis maximum of 5" (1.5 mgon)

Motorised Threaded Pole Adapter GDF311 Survey Tribrach Without Optical Plummet 0

Motorised Threaded Pole Adapter GDF311 Survey Tribrach Without Optical Plummet 1