Document ID: chunk:federal_register_of_legislation:F2007C00022:body:0:p6
Version: federal_register_of_legislation:F2007C00022
Segment Type: other
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Character Range: 16029–18812

surface of the internal mirror and the mirror on the driver's side shall be flat
14.7.2.                          The technical requirements relating to the component aspect of ECE R81/00 shall be deemed to meet the requirements of Clause 14.5.1.2.
14.7.3.                          In addition, the technical requirements relevant to two-wheeled vehicles of ECE R81/00, 'UNIFORM PROVISIONS CONCERNING THE APPROVAL OF REAR-VIEW MIRRORS AND OF TWO-WHEELED POWER-DRIVEN VEHICLES WITH OR WITHOUT SIDE CAR, WITH REGARD TO THE INSTALLATION OF REAR-VIEW MIRRORS ON HANDLEBARS.", shall be deemed equivalent to those of clause 14.5.1.2 of this regulation.
APPENDIX A

(EXTRACTED FROM FMVSS 111 "REAR VIEW MIRRORS", SECTION 12)

     S 12  Determination of Radius of Curvature.

     S 12.1  To determine the average radius of curvature of a convex mirror, use a 3-point linear spherometer, which meets the requirements of S 12.2, at the 10 test positions shown in Figure 1 and record the readings for each position.

     S 12.2  The 3-point linear spherometer has two outer fixed legs 1.5 inches apart and one inner movable leg at the midpoint. The spherometer has a dial indicator with a scale that can be read accurately to 0.0001 inches, with the zero reading being a flat surface.

     S 12.3  The 10 test positions on the image display consist of two positions at right angles to each other at each of five locations as shown in Figure 1. The locations are at the centre of the mirror, at the left and right ends of a horizontal line that bisects the mirror and at the top and bottom ends of a vertical line that bisects the mirror. None of the readings are within a 0.25 inch border on the edge of the image display.

     S 12.4  At each position, the spherometer is held perpendicular to the convex mirror-surface and a record is made of the reading on the dial indicator to the nearest 0.0001 inch.

     S 12.5 Convert the dial reading data for each of the 10 test positions to radius of curvature calculations using the following formula.

      where  R = Radius of curvature
      H = Linear displacement of the centre probe
      C = Chord Length =13 inches

     S 12.6 Calculate the average radius of curvature by adding all 10 radius of curvature calculations and dividing by ten.

     S 12.7  Determine the numerical difference between the average radius of curvature and each of the 10 individual radius of curvature calculations determined in S 12.5.

     S 12.8 Calculate the greatest percentage deviation by dividing the greatest numerical difference determined in S 12.7 by the average radius of cu nature and multiply by 100.

NOTES
This compilation of Vehicle Standard (Australian Design Rule 14/01 - Rear Vision Mirrors) 2006 includes all the instruments set out