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The Lawnmowers (Harmonization of Noise Emission Standards) Regulations 1992
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- 1992 No. 168
- SCHEDULE 3
- PART 1
- Regulation 7.2
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7.2 Measurement of the sound pressure level LpA
To measure the sound pressure level LpA, use shall be made of an instrument as defined in 5.2. The sound pressure level LpA at a given measuring point is the root mean square value in time of the sound pressures. If a sound level meter is used, a number of readings shall be taken at this point and their mean value in time calculated in accordance with section 11.
When the mower is stationary the measuring time at each point shall be 15 seconds. If an integrator is used, the integrating times shall be equal to that measuring time.
When the mower is in motion, the measuring time shall be the time which it takes to cover the 2 metre distance AB (as shown in Figure 1) at constant speed.
The sound pressure levels LpA of a lawnmower shall be measured at least three times. If the sound power levels obtained from these measurements differ by more than 1 dB, further measurements shall be taken until two power levels are obtained which do not differ by more than 1 dB and the higher of which shall be the sound power level of the lawnmower.
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