The measurement point is set on the property line of a factory or work yard. However, if this location is deemed inadequate for measurement, measurements can be taken from an arbitrary point outside the property line. The frequency-weighted characteristic is the A characteristic, while the time averaging characteristics is the F (Fast) characteristic. The rest of the measurement method is as specified in JIS Z8731 (ISO1996-1.2).
The measurement point is set on the property line of specified construction work site. The frequency-weighted characteristic is the A characteristic, while the time averaging characteristics is the F (Fast) characteristic. The rest of the measurement method is as specified in JIS Z8731 (ISO1996-1.2).
| [1] When noise level meter indication fluctuates little or
not at all (Type 1) If fluctuation stays within 2 - 3 dB, the most frequent reading is taken. Example: Air conditioning outdoor unit |
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| [2] When noise level meter indication is irregular or fluctuates
greatly (Type 2) The maximum reading (LA5) in a 90% range of the measured value is taken. Example: Earth drill |
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| [3] When noise level meter indication fluctuates periodically
or intermittently, but the maximum value is roughly constant (Type 3) The average of the maximum values (LAmax) indicated in each fluctuation is taken. Example: Pile driver |
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| [4] When noise level meter indication fluctuates periodically
or intermittently, and the maximum value is not constant (Type 4) The maximum reading (LA5) in a 90% range of the maximum value indicated in each fluctuation is taken. Example: Hydraulic excavator |
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As a rule, measurements are taken from a height of 1.2 to 1.5 m above ground.