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Significance and Use
Friction characteristics of road surfaces are monitored by friction measurement systems, and the operating procedure for the use of these systems is found in Test Method . However, mechanical or electronic system anomalies, over time, could result in measurement errors or inaccuracies. This requires that each of these systems be evaluated, calibrated and correlated on a regular basis.
This guide defines the process of ensuring that Test Method systems produce consistent and accurate data and correlating the Test Method systems to national benchmark Test Method systems.
1.1 This guide describes the evaluation, calibration, and correlation of Test Method friction measurement systems as conducted at a Field Test Center (FTC) . The evaluation, calibration and correlation process; using the specialized equipment, facilities, surfaces, trained personnel, and Area Reference Friction Measurement Systems (ARFMS) available at each FTC; are conducted using the procedures described below.
1.2 The FTC complies with the requirements of Guide . Guide requires a more stringent calibration process and requires all ARFMS system be correlated together once a year on three surfaces at three speeds with twelve repeats each for a total of 108 pairs.
1.3 This guide is offered as a process to identify and quantify the variables that affect system performance, to minimize the effect of these variables, and to provide a means to relate Test Method friction measurement systems to reference skid measurement systems.
1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
E274 Test Method for Skid Resistance of Paved Surfaces Using a Full-Scale Tire
E501 Specification for Rib Tire for Pavement Skid-Resistance Tests
E524 Specification for Smooth Tire for Pavement Skid-Resistance Tests
E556 Test Method for Calibrating a Wheel Force or Torque Transducer Using a Calibration Platform (User Level)
E867 Terminology Relating to Vehicle-Pavement Systems
E1890 Guide for Validating New Area Reference Skid Measurement Systems and Equipment
F377 Practice for Calibration of Braking/Tractive Measuring Devices for Testing Tires
F457 Test Method for Speed and Distance Calibration of Fifth Wheel Equipped With Either Analog or Digital Instrumentation
ICS Number Code 21.260 (Lubrication systems)