A Falling Weight Deflectometer (PAVE®FWD-VM) is a vehicle mounted non-destructive testing device used to determine the stress/strain parameters of pavements and subgrades.


A four way split specially designed loading plate is placed on the surface of the pavement and a load pulse is applied to the plate. The load pulse is generated by the impact of a falling weight. The load pulse is designed to cause a deflection that closely simulates the deflection caused by a wheel load passing at normal speed.

The unique FWD system can be installed into many different vehicle configurations. With a total weight of only 550kg the FWD system is ideally suited for light passenger vehicles, pickup trucks or mini vans.

FWD Range Vehicle Mounted Systems offer greater comfort, manoeuvrability and increased safety at highway speeds.

Enhanced Digital Geophones supplied as standard to eliminate electrical interference giving greater accuracy in deflection readings


  • UK manufactured based on a proven international design to ASTM D 4694
  • Digital Geophones
  • Vehicle Mounted system give greater safety and manoeuvrability over trailer mounted systems
  • Automatic controlled load adjustment for greater accuracy
  • Quick and easy to operate - just 28 seconds to perform a standard test
  • Ambient, ground and In-Ground temperature sensors as standard
  • Safety interlocking system
  • Calibrated to AASHTO R-32 international standard by qualified engineers
  • Output File format, in CSV, PDDX, MDB, F20, F25, PAV


  • Standard 5, Upgradeable to 23 deflection sensors
  • Multiple Vehicle Selection available ? contact PaveTesting for more information
  • Configurable load plate dimensions (450mm and 600mm available)
  • Camera system with live video and for load plate monitoring with option to take photos using the second Camera
  • Global Positioning Data recorded at each drop location
  • Back Calculation Software
  • PaveGPR ? Ground Penetrating Radar for
  • Layer Thickness measurements


  • 7 - 150kN Load Range
  • Power Source 12V DC ? Vehicle Power
  • Repeatable to within 1% total machine weight 450kg