The Planograph is used to determine the smoothness of road surfaces in a longitudinal profile. It detects deviations in the road surface central to a 4 m long virtual zero line almost continuously and is made up of a frame with 10 running wheels, a support wheel, a measuring wheel, and a drawbar. The Planograph is pulled along the length of the road surface by the person carrying out the inspection. During this process, the distance covered and the vertical movement of the measuring wheel below the zero lines are recorded on an SD card. When the limit – usually of 4 mm – is exceeded, a warning signal sounds, and the value is recorded separately for the calculation (p, sqp).
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