Triax cable systems, Precautions – Grass Valley HD Wireless User Manual
Page 9
HD Wireless User’s Guide (v6.2)
9
Triax cable systems
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Only connect a Triax cable from the same LDK camera family to the unit.
•
Do not allow system earth currents to exceed 1.5 A in the outer shield of the Triax cable or
0.2 A in other cable shields.
•
To avoid excessive earth currents in a Triax system, galvanically separate the power earth
connection of equipment connected to the AMU from the AMU earth.
•
It is strictly prohibited to short circuit the inner and outer shields of a Triax cable used to
connect an AMU to a WCU.
Galvanic separation
Because of the nature of Triax systems, with long distances between AMU and WCU, the risk
of earth currents flowing is greater. These earth currents can result in damage to the
equipment.
To prevent earth currents from flowing in the Triax system, we recommend galvanic separation
of earthed equipment connected to the AMU. This separation can be achieved by using an
isolation transformer between the local power outlet and the equipment connected to the
AMU. Alternatively, use equipment that has a double insulation and therefore does not require
an earth connection.
Precautions
To ensure continual high performance from the camera take the following precautions into
consideration:
•
Avoid very damp places. If the environment is wet or damp a rain cover must be used to
protect the unit.
•
Do not subject the unit to severe shocks or vibration.
•
Do not expose the camera to extreme temperatures.
•
Do not leave the unit in direct sunlight or close to heating appliances for extended periods.
•
Do not allow sunlight to shine into the viewfinder.
•
Do not allow LASER beams to shine into the lens as this could damage the CCD sensors.
•
Avoid extreme highlights as these can cause various kinds of optical reflections.
•
Be careful when connecting and disconnecting triax cables.
–
Do not mix triax units from different types of camera systems (HD with SD, RGB triax
with digital triax).
–
Make connections swiftly and firmly to avoid false error messages.