Operating Instructions for Sound Level Meters
Noise measurement of sound level meters:
Press the power switch key of the sound level meter to check whether the function key of the sound level meter is correct. If it is not correct, you can press the function key of the sound level meter to make a selection. The default standard setting when starting up is normal sound level measurement, A-weighting, and the time characteristic is "fast". Lp- ordinary sound level meter measurement, Leq- equivalent continuous A sound level measurement. That is, the average value of the sound level meter under the A-weighting measurement method within a set period of time. LN-statistical sound level meter meter measurement. That is, in the measurement, the measured value greater than or equal to the set alarm value accounts for the percentage of all measured values. Check whether the weighting selection is correct. If not, you can select 'A', 'C' or 'F' weighting by pressing the weighting selection key. When 'A' weighting is selected, the frequency response characteristics of the instrument are similar to the frequency response characteristics of the sound that can be heard by human ears. The 'A' weighting feature is widely used, and it is commonly used in environmental noise measurements, hearing protection programs such as hearing tests under the Occupational Safety and Health Regulations, and noise regulation enforcement. Select 'C' weighting measurement, which can measure wider sound frequency response, and is mostly used for sound measurement of machines, engines and other places. Selecting 'F' measurement is the sound level measurement of all frequency signals without processing all frequency signals.
Note: When measuring the equivalent continuous A sound level, the 'A' weighted measurement will be automatically selected.
Check if the fast/slow feature is correct. If it is not correct, you can use the fast and slow keys to select the fast FAST (125 milliseconds) or slow SLOW (1 second) of the time characteristic. When the noise changes quickly and you want to capture the noise peak, you should choose the 'fast' FAST file; when the noise source changes relatively gently or you need to equalize the sound source when the speed changes, you should choose the 'slow' SLOW file. The 'SLOW' time weighting file is widely used.
