Common use of MEASURING EQUIPMENT Clause in Contracts

MEASURING EQUIPMENT. 4.3.1. A sensor suitable for measuring speed and distance covered on snow/ice surface between two speeds must be used. To measure vehicle speed, a fifth wheel or non-contact speed-measuring system (including radar, GPS …) shall be used. 4.3.2. The following tolerances shall be respected: (a) For speed measurements: ±1 per cent (km/h) or 0.5 km/h whichever is greater. (b) For distance measurements: ±1 x 10-1 m 4.3.3. A display of the measured speed or the difference between the measured speed and the reference speed for the test is recommended inside the vehicle so that the driver can adjust the speed of the vehicle. 4.3.4. For Acceleration test covered in paragraph 4.7. below, a display of the slip ratio of the driven tyres is recommended inside the vehicle and shall be used in the particular case of paragraph 4.7.2.1.1. below. The slip ratio is calculated by (a) Vehicle speed is measured as defined in 4.3.1. above (m/s) (b) Wheel speed is calculated on a tyre of the driven axle by measuring its angular velocity and its loaded diameter Where, π = 3.1416 (m/360deg), the loaded diameter (m) and the angular speed (revolution per second = 360 deg/sec). 4.3.5. A data acquisition system can be used for storing the measurements.

MEASURING EQUIPMENT. 4.3.1. A sensor suitable for measuring speed and distance covered on snow/ice surface between two speeds must be used. To measure vehicle speed, a fifth wheel or non-contact speed-measuring system (including radar, GPS …) shall be used. 4.3.2. The following tolerances shall be respected: (a) For speed measurements: ±1 per cent (km/h) or 0.5 km/h whichever is greater. (b) For distance measurements: ±1 x 10-1 m 4.3.3. A display of the measured speed or the difference between the measured speed and the reference speed for the test is recommended inside the vehicle so that the driver can adjust the speed of the vehicle. 4.3.4. For Acceleration test covered in paragraph 4.7. below, a display of the slip ratio of the driven tyres is recommended inside the vehicle and shall be used in the particular case of paragraph 4.7.2.1.14. 7.2.1.1. below. The slip ratio is calculated byby Slip Ratio %   Wheel Speed  Vehicle Speed  100    Vehicle Speed  (a) Vehicle speed is measured as defined in 4.3.1. above (m/s) (b) Wheel speed is calculated on a tyre of the driven axle by measuring its angular velocity and its loaded diameter Wheel Speed  π loaded diameter  angular speed Where, π = 3.1416 (m/360deg), the loaded diameter (m) and the angular speed (revolution per second = 360 deg/sec). 4.3.5. A data acquisition system can be used for storing the measurements.

MEASURING EQUIPMENT. 4.3.1. A sensor suitable for measuring speed and distance covered on snow/ice surface between two speeds must be used. To measure vehicle speed, a fifth wheel or non-contact speed-measuring system (including radar, GPS …) shall be used. 4.3.2. The following tolerances shall be respected: (a) For speed measurements: ±1 per cent (km/h) or 0.5 km/h whichever is greater. (b) For distance measurements: ±1 x 10-1 m 4.3.3. A display of the measured speed or the difference between the measured speed and the reference speed for the test is recommended inside the vehicle so that the driver can adjust the speed of the vehicle. 4.3.4. For Acceleration test covered in paragraph 4.7. below, a display of the slip ratio of the driven tyres is recommended inside the vehicle and shall be used in the particular case of paragraph 4.7.2.1.14.7. 2.1.1. below. The slip ratio is calculated by: Slip Ratio % = ⎡ Wheel Speed − Vehicle Speed⎤ ×100 ⎣ ⎦ ⎢ Vehicle Speed ⎥ (a) Vehicle speed is measured as defined in 4.3.1. above (m/s); (b) Wheel speed is calculated on a tyre of the driven axle by measuring its angular velocity and its loaded diameter Wheel Speed = π × loaded diameter × angular speed Where, π = 3.1416 (m/360deg), the loaded diameter (m) and the angular speed (revolution per second = 360 deg/sec). 4.3.5. A data acquisition system can be used for storing the measurements.