Leica Zeno GG04, Safety Directions
9
Lightning conduc-
tors
Suggestion for design of a lightning conductor for a GNSS system:
1) On non-metallic structures
Protection by air terminals is recommended. An air terminal is a pointed solid or
tubular rod of conducting material with proper mounting and connection to a
conductor. The position of four air terminals can be uniformly distributed around
the antenna at a distance equal to the height of the air terminal.
The air terminal diameter should be 12
mm for copper or 15
mm for aluminium. The
height of the air terminals should be 25
cm to 50
cm. All air terminals should be
connected to the down conductors. The diameter of the air terminal should be kept
to a minimum to reduce GNSS signal shading.
2) On metallic structures
Protection is as described for non-metallic structures, but the air terminals can be
connected directly to the conducting structure without the need for down conduc-
tors.
Air terminal
arrangement, plan
view
Grounding the
instrument/antenna
1.6
Electromagnetic Compatibility EMC
Description
The term Electromagnetic Compatibility is taken to mean the capability of the product
to function smoothly in an environment where electromagnetic radiation and electro-
static discharges are present, and without causing electromagnetic disturbances to
other equipment.
WARNING
Electromagnetic radiation can cause disturbances in other equipment.
Although the product meets the strict regulations and standards which are in force in
this respect, Leica Geosystems cannot completely exclude the possibility that other
equipment may be disturbed.
a) Antenna
b) Support structure
c) Air terminal
GS_039
a
b
c
a) Antenna
b) Lightning conductor array
c) Antenna/instrument connection
d) Metallic mast
e) Connection to earth
GS_040
e
d
c
a
b
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