This small instrument fits comfortably between the dual rear wheels of a test truck and measures the relative movement across the crack traversed by the dual wheels.
Both vertical and horizontal movements are recorded.

A knowledge of the magnitude of crack movement helps in the selection of an appropriate new surfacing seal to accommodate crack movement.

Active cracks can reflect through a new surfacing if the new surfacing is unable to accommodate the crack movement.

The load used for testing is the standard 80 kN axle (40 kN dual wheel) and the test is performed at creep speed. The encoder reads the distance travelled by the wheel in relation to the CAM.

The portable interface is capable of running off its own battery power supply or 12 V cigarette lighter option.
Data is stored on the coupled laptop computer.

The complete system excluding the computer fits into a aluminium suitcase for convenient transportation.

.Dimensions of suitcase: 46 x 33 x 15 cm
Approx mass: 12,3 kg

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Dynatest International A/S
Rev. 040101-10