BS ISO 13772:2018 pdf download

BS ISO 13772:2018 pdf download

BS ISO 13772:2018 pdf download.Forestry machinery — Portable chain-saws — Non- manually actuated chain brake performance
1 Scope
This document specifies a method for checking the functioning and performance of the non-manually actuated chain brake on an electric or gasoline engine powered, portable hand-held chain-saw.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 6531, Machinery for forestry — Portable chain-saws — Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 6531 apply.
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4 Performance requirements
The non-manually actuated chain brake function shall be checked on a new normal production saw equipped with the shortest and longest guide bars specified in the instruction handbook, but no longer than 500 mm. Battery-powered chain-saws shall be checked with the lightest and heaviest battery packs. When tested in accordance with Clause 8, the performance of the actuation function of a non-manually actuated chain brake is considered acceptable if each of the horizontal and vertical acceleration levels (a x and a y ) at which the chain brake actuates is below the appropriate threshold level as shown in Figure 1 a), b) or c) for different chain-saw types and sizes.
6 Test equipment
6.1 Acceleration measuring equipment
The total mass of the accelerometer(s) shall be as low as possible and shall not, in any case, exceed 50 g, including the mounting, but excluding the cables. The signal from the accelerometer(s) shall be processed by a low-pass filter having characteristics in accordance with Annex A. Care shall be taken when mounting the accelerometer(s) so that the transfer function is flat up to 300 Hz in both measuring directions. For general considerations concerning accelerometer mounting, see ISO 5348. The transfer function may be considered flat if an addition of mass to the accelerometer, equal to that of the accelerometer itself, does not have any significant influence on a x and a y . This additional mass should be placed between the accelerometer and its mounting if the mass is of metal, or around the accelerometer if the mass consists of materials such as clay or wax. The accuracy of the measuring equipment, excluding accelerometer mounting and filter, shall be ±5 % of the registered value in the frequency range from 0 Hz to 300 Hz. See ISO 16063-1 for calibration methods.