D.F. Tester is a portable instrument to measure the frictional
characteristics of paved surfaces in laboratories and on field
at roads, highways, airport taxi-ways, runways and other areas.Among
many such instruments introduced to the market today,the D.F.
Tester is being used widely not only in Japan but also in
the EU, the United States and many other countries at government
agencies, construction companies, independent consulting companies,automotive
manufacturers, tire manufacturers, research institutions and
universities among many other organizations.
The equipment has many exceptional features and characteristics
that clearly gives unique advantages to the device. The easy
handling and portability of the device make it ideal in using
both on field and in the laboratory. Measures the friction
from high speeds to static friction and depicts the friction
? speed relationship in one single measurement.The unit is
easy to use and removes measurement dependency on operators
and from the results, it also can be used in small restricted
areas where other measurements are not possible.
The DFTester also compliments the CTMeter laser texture measuring
device in a unique way: it measures the frictional characteristics
of the excat same physical surface where the surface macro
texture was measured by the CTMeter giving direct match to
analyze friction and texture.
The D.F. Tester is published in the [Pavement Investigation/Test
Method Manual] editted by Japan Road Association] as an instrument
to measure skid resistance on paved road surfaces. It is acknowledged
and published in the FHWA's (Federal Highway Administration)
Measuring Instrument Guide.
The device also is incorporated in the American Association
of State Highway and Transportation Officials'(AASHTO) "Guide
to Pavement Friction" and in the same book that is also
published by the National Cooperative Research Program (NCHRP)
of the US Academy under Document 108.
The New USB Version D.F. Tester has been designed to decrease
the time required for and the cost of a measurement as it
can complete measurements with the automated control of a
connected Personal Computer in short time.(from starup through
pin-up to speed, automatic water control from tank, measurement
start and collection, analysis and storage of measured data.
A set of three rubber sliders, with rubber composition identical
to that of the ASTM (American Society for Testing andMaterials)
standard test tire for skid resistance measurement, are used