High Accurate Leica GDF122 Tribrach with Optical Plummet Red Base
for Prism Total Station GNSS
Model: GDF122
Specifications:
| Model | GDF122 |
| Brand | 100% Leica Original |
| Color | Green with Red Base |
| Optical Plummet | With |
| Weight | 850g |
| Package | Individual Box Package |
| Accuracy | Torsional stiffness <1" |
| Type | Survey Instrument Accessory |
| Bubble | 8' Circular Bubble |
| Used For | All motorized instruments |
Can I use a tribrach with an optical plummet?
A tribrach can be used with an optical plummet or any other survey
instrument, which can include but may not be limited to:
- Theodolite
- Total station
- GNSS antenna
- Target
It allows you to attach these instruments to a tripod, so you can
achieve more stability while you’re using it.
Can I use a tribrach with a total station?
You can use a laser tribrach with any type of laser measuring tool,
but you can also use it with a total station or any other surveying
instrument. This device will allow you to attach your instrument to
a tripod, so it can be more stable while you’re using it.
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)
Leica 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.
