Technical Information DFS 700 / 04.2009 4-1
4 Technical Description
4.1 Intended use
The DFS 700 (Figure 3-1) is used to measure and display the speeds of vehicles driving into
the radar beam. These measurements are displayed to the vehicle, recorded and can be
evaluated statistically by the user program DFS-CAS.
The monitoring of traffic speeds in flowing traffic is particularly usefull for the following traffic
zones:
• Traffic zones with particular speed limits; e.g. residential areas, inner-city areas and
building sites.
• Dangerous traffic spots, such as curves, bridges and tunnels.
• Traffic zones that have to be driven carefully, e.g. in front of hospitals, schools, bus-stops,
streets with surfaces that are dirty or produce noise.
The spray-protected DFS 700 can be used outdoors permanently independent of weather
given the appropriate power supply. As a result of the reflective sheet on the frame (Figure 3-1
Item 1) the DFS 700 can be easily spotted by drivers during the day and especially in the dark
due to reflection from the vehicle's headlamps. If necessary, additional information can be
attached to the reflective area of the frame (Figure 3-1 Item 1).
4.2 Functionality
In the ready-to-use state (power supply created, switched on and initial settings made by the
user program DFS-CAS), the radar sensor (Figure 3-1 Item 4) measures the speed of an
approaching vehicle. The radar sensor (Figure 3-1 Item 4) is located in the lower field of the
central figure.
In normal operation the vehicle’s speed is displayed in LED-digits (Figure 3-1 Item 5) on the
speed display (Figure 3-1 Item 3). The colour of the digits can be set to green or red.
As a rule, speeds set as permissible are displayed in green, speeds exceeding the speed limit
in red.
The LED-digits adapt their intensity to the ambient light conditions.
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