3M DFS 700

Technical Information DFS 700 / 04.2009 7-1
7 Installation and Operation
7.1 Selecting the installation location for DFS 700
To ensure correct measurements the location for the DFS 700 must be selected according to
the following criteria:
• There must be an unobstructed visual field of at least 150 metres in front of the DFS 700. In
this area and in the radar beam there must be no objects such as trees, poles, parking
vehicles etc. Otherwise the speed display may be falsified and the radar range reduced.
Trees, in particular reduce the radar range
• The location of the DFS 700 must be at least 65 metres away from large traffic signs.
Otherwise these large traffic signs can reflect the radar beams such that the vehicles in the
opposite lane could be recorded by the radar beam.
• Do not set the DFS 700 up directly at crossing intersections or bridges. The DFS 700 must
be at least 125 metres away from crossing traffic, as it could otherwise also record the
crossing traffic as oncoming vehicles.
• Where solar cells are used for powering the DFS, the location must have an unhindered
view of the sky to achieve the highest charge-capacity. Trees and buildings can cast
shadows on solar panels and therefore greatly reduce the performance of the solar cells.
• The environment around the optional GSM antenna must be kept free of metallic objects so
as to guarantee optimum data transfer over the mobile phone network.