BS ISO 07116:2011 pdf free download – Mopeds – Measurement method for determining maximum speed.
The photoelectric cell and electronic time counter system, or the equivalent system, shall be used to measure the moped speed. Care shall be taken with the set-up adjustment of photoelectric cells or equivalent sensors (e.g. height of the sensors and the crossing point of the photo-beam and the moped) so that the required accuracy of the length of measurement section is secured. The details of the system shall be given in the test report if the equivalent system is used.
The function and accuracy of the test equipment shall be checked before use in the test.
8.2 Measurement accuracies
8.2.1 Accuracy of speed measurement system
The error of measured moped speed is influenced by the total time to run the measurement section(s), t, the length of the measurement section(s), Let, the accuracy of the time measurement equipment, Atime, and the accuracy of measurement equipment of the measurement section length, Alen.
The length of the measurement section shall be chosen with reference to instrument accuracy and to the method of determining the running time, such that the actual speed is measured to an accuracy of ±1 %.
The accuracy of measurement equipment (e.g. the tape measure or the surveying instrument) of the measurement section(s) length, Alen, shall be given in the test report.
The accuracy of time measurement equipment, Atime, is determined by the accuracy of the electronic time counter system itself and the response time of the photoelectric cell sensor. Atime shall be given in the test report.
8.2.2 Measurement accuracy of ambient atmospheric conditions
The accuracies of equipment used to measure the ambient atmospheric conditions shall be in accordance with Table 2.
The difference in altitude between any two points on the measurement section shall not exceed I m. However, the slope to compensate the centrifugal force of loop type and circle type test tracks may be allowed.
The shape and dimensions of the test track and the location of the measurement section(s) shall be given in the test report or replaced by the figure.
9.2 Composition
The test track shall consist of the following sections:
a) the acceleration section to reach maximum speed;
b) the maximum speed measurement section;
c) the deceleration section to safely stop the test moped.
9.3 Possible shapes and specific requirements
9.3.1 The straight type test track
9.3.1.1 Type I
The measurement section as shown in Figure 1 shall be located on the straight track. The acceleration sections to the left and right of the measurement section shall be long enough to enable maximum speed to be attained at the measurement section.