Can the verification items of the sound level meter be freely selected?
No, there are 10 routine verification items for sound level meters (sound level meter indication sound level adjustment, frequency weighting, level linearity, time weighting F and S, self-generated noise, sound burst response, repetitive sound burst, peak C sound level , overload instructions), all meet the requirements before issuing a test certificate. For many sound level meters that have not obtained a type approval certificate (CPA), only 2 to 5 items can meet the requirements, and other functions either do not have or cannot meet the standards. At this time, the measurement unit usually only gives out the items that have passed the inspection, and can only issue a sound level meter calibration certificate.
Correct use of sound level meter
1. Selection of the environment in which the sound level meter is used: select a representative test location, and the sound level meter should be kept away from the ground and the wall to reduce the additional impact of the reflected sound from the ground and walls.
2. The weather conditions require that the sound level meter should keep the diaphragm of the microphone clean when there is no rain or snow. When the wind force is above level 3, a wind cover must be added (to avoid wind noise interference), and the measurement should be stopped for strong winds above level 5.
3. Open the carrying case of the sound level meter, take out the sound level meter, and put on the sensor.
4. Put the sound level meter in the measurement state, check the battery, and then calibrate the sound level meter.
5. Use the comparison table (commonly referred to as environmental sound level) to adjust the measurement range.
6. The following can be used fast (measure the instantaneous value of the environment where the sound pressure level changes greatly), slow (measure the average value in the environment where the sound pressure level does not change much), pulse (measure the pulse sound source), filter ( Measure the sound level of the specified frequency band) Various functions are used for measurement.
7. Record data as needed, and also connect to a printer or other computer terminals for automatic collection. Organize equipment and put it back in the designated place.
