Dynatest TTT 995

The Dynatest 995 Tire Traction Tester measures average locked wheel (skid) and peak incipient (slip) friction characteristics on paved surfaces.

995 1995-6Dynatest 995B2 tow vehicle and test trailerIt is used for tire testing to evaluate dry or self-wetted locked wheel (skid) and peak incipient friction characteristics of tyres at operation speeds between 20 and 70 mph (30 to 110 km/h).

The 995 consist of a fully instrumented tow vehicle and test trailer, that uses a Dynatest two-axis force transducer to provide dynamic vertical load and horizontal tractive force measurements.

As a pavement measurement device, it meets all the requirements of ASTM E274 "Standard Test Method for Skid Resistance of Paved Surfaces Using a Full-Scale Tire" as well as ASTM F408 "Standard Test Method for Tires for Wet Traction in Straight-Ahead Braking, Using a Towed Trailer".

Trailer Assembly
The two-wheel trailer is equipped with a parallelogram suspension, stabiliser bar and disc brakes. An axle mounted force transducer provides direct measurement of the horizontal tractive friction force and the dynamic vertical load on the wheel

Trailer available in Stainless Steel.

995 Program


All electronic instrumentation is solid state.

User friendly, menu-driven software allows the operator to enter and document multiple test parameters.

The on-board laptop computer computes the dynamic Skid Number (SN) from the two-axis force transducer in real time, and displays the friction and speed traces for each test.

Test headers, skid numbers, as well as curves and peak incipient friction if desired, can be printed or stored.
Additional software capabilities include automatic system calibration, full system diagnostics, adjustable test cycle timing (within ASTM-E274 specifications), as well as the ability to exit the program and use commercially available software.

Vehicle Instrumentation
The system is equipped with digital optical encoders to accurately measure distance and monitor test speeds, a hand remote switch to initiate the automatic test, an industrial rated PC and graphics printer.

Real Time Dynamic Skid Curve
The operator can display all test results both graphically and numerically.
The computer automatically controls all phases of the friction testing cycle.

All test results can be displayed and saved to disk.

Optional Features

  • Differential Geographical Positioning System DGPS
  • Integrated Selcom texture laser
  • Dual Side water system.

Auto Calibration Menu

Auto Calibration Menu

Auto Calibration allows the operator to automatically calibrate the electronic measurement equipment with the two-axis force transducer.

The system's computer calculates the gain and the offset values for the force transducer and graphically displays the results.

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