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4.7 Tribrach
The yoke is mounted in a tribrach. The three mounting feet in the base of the yoke unit fit into the corresponding
holes in the tribrach and a latch holds the Quarryman Pro in place. The tribrach allows the system to be mounted
on a tripod with standard 5/8 inch thread. Use the tribrach’s foot-screws to level the instrument, with reference to
the levelling bubble on the yoke.
A circular bubble on the tribrach can be used for rough levelling of the tripod and tribrach before the Quarryman Pro
itself is attached. However, always use the bubble on the yoke of the Quarryman Pro for accurate levelling of the
instrument before starting a survey.
The tribrach incorporates an optical plummet which is required if the Quarryman Pro needs to be set up over a fixed
survey station.
Figure 8 Dimensions from embossed cross on side panel to GPS mount point
Offset to top of
carrying handle:
141 mm
Offset to top of knurled
centre of 5/8 inch
male-to-male adaptor:
149 mm
Figure 9 Tribrach
