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The 1295 consists
of a fully instrumented tow vehicle and test trailer which uses the
Dynatest two-axis force transducer to provide dynamic vertical load and
horizontal tractive force measurements.
As a pavement measuring
device, the 1295 meets all the requirements
of
ASTM-E274
"Specification For Skid Resistance Using A Full Scale Tire."
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1295 fully instrumented tow vehicle and test
trailer
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Friction Tester Field Program
All electronic instrumentation is
solid state. User friendly, menu-driven Windows software allows the operator to enter and
document multiple test parameters.
The field program calculates 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, can
be printed and stored.
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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Vehicle Instrumentation
The system is equipped with digital optical encoders to accurately
measure distance and monitor test speed, a hand remote switch to initiate the automatic test,
laptop PC and graphics printer. 
Interior of cab
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Real Time
Dynamic Skid Curve
From the "Auto Test" menu 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. |
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The Maryland State Highway Administration
1295 Pavement Friction System.
Custom International Truck Chassis with utility body provides covered
storage for air systems and spare tire storage. |
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Transducer Output/System Diagnostics Menu
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 PFT program
and use commercially available software.
Force transducer
· View bridge characteristics (forces, gains, offsets)
· Activate bridge calibration circuitry (verify gains & offsets)
Tachometer
· Distance counting (wheel encoder distance pulse counting)
· Velocity measurement (timer latch counting
Brake system
· Brake activation
Water system
· Nozzle activation
Options
· GPS, dual-side watering and texture laser
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The Maryland State Highway Administration
1295 Pavement Friction Test System.
Delivered in 2005, equipped with a 1000 gallon (4000 liter) water tank. |
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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 dynamic horizontal tractive friction force and the dynamic vertical
load on the wheel.
A laminar flow nozzle (ASTM
E274) is automatically raised and lowered for each test.
Utilises
ASTM E501
or
E524
smooth test tires.
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1295 Operation Manual (2.7 Mb, .pdf format)
Adobe Acrobat Reader 5+ Required -
available from
www.adobe.com
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1290 Video
for Windows® Media Player (592 Kb .wmv File)
1290 Video
for RealPlayer G2® (1.75 Mb .rm File)
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The Michigan Department of Transportation
1295 Friction Tester. |
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Click here for
Equipment Service and Support Departments |
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Download
brochures in PDF format for printing.
The 1295
Pavement Friction Tester.pdf file (72 Kb) |
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Dynatest
International
Rev.040101-10 |
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