BS ISO 9533:2010 pdf download – Earth-moving machinery — Machine-mounted audible travel alarms and forward horns — Test methods and performance criteria 7.5.2.3 Method 2 — Self-adjusting sound level alarm The recorded values from “Alarm On” shall be a minimum of 3 dB greater than the measured values from “Alarm Off” at each test measurement location. 7.5.3 Reverse warning alarm — Operator location test The recorded values from “Alarm On” shall be no more than 3 dB greater than the measured values from “Alarm Off” at test measurement location 9. 7.5.4 Forward horn — Exterior test The forward horn A-weighted sound pressure level shall exceed the A-weighted sound pressure level of the machine at maximum governor engine speed (high idle) by at least 10 dB at test measurement location 8. NOTE Mandatory national and/or regional provisions could also apply to forward horns. 7.5.5 Travel warning alarm — Exterior test 7.5.5.1 General The A-weighted sound pressure level determined at test measurement locations 5, 10 and 11 for the alarm activation test shall meet the sound pressure level criterion given in 7.5.5.2 or 7.5.5.3, as appropriate. 7.5.5.2 Method 1 — Fixed sound level alarm The recorded values from “Alarm On” shall be greater than or equal to the recorded values from “Alarm Off” at each test measurement location. 7.5.5.3 Method 2 — Self-adjusting sound level alarm The recorded values from “Alarm On” shall be a minimum of 3 dB greater than the measured values from “Alarm Off” at each test measurement location. 8 Alarm activation requirements 8.1 Reverse warning alarm The reverse warning alarm shall be automatically activated upon the machine being activated for travelling in reverse. For machines with two independent propel drive systems, e.g. hydrostatic and hydraulic propel drive systems, the reverse warning alarm does not need to be activated and begin sounding until both propel drive systems are activated for reverse travel. Slow reverse movement is allowable without the reverse warning alarm sounding on some types of travel control systems, e.g. mechanical controls, based on a risk assessment having been performed. The reverse warning alarm shall continue to sound until the machine is deactivated for travelling in reverse. 8.2 Forward horn The forward horn shall be manually activated by a dedicated control and continue to sound as long as the operator activates the control within the limits of the horn itself. If the horn is to be used for...
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