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Model: GDF311
Specifications:
Torsional stiffness <3", weight 780 grams
Introduction:
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.
Tribrach
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)