Is it useful for a sound level meter to only issue a calibration certificate?
The calibration certificate issued by the sound level meter is generally invalid, because the calibration certificate only issues the basic data report, and the report cannot cover all the required inspection items, so it is impossible to judge the accuracy level of the instrument based on the data in the calibration report. Determine whether the sound level meter is qualified. The risk of random use of a sound level meter is high when it is not clear whether the accuracy level of the sound level meter is qualified. Only a sound level meter that has issued a verification certificate and drawn a qualified conclusion and accuracy level can be used normally.
The sound level meter is a mandatory verification measuring instrument. If the verification institution only issues a calibration certificate or a test report, it means that the performance index of the sound level meter cannot meet the requirements of GB/T 3785.1-2010 (IEC 61672-1:2013). According to the verification regulations JJG 188-2017 test failed.
Another situation is that the sound level meter itself is qualified, but if the measurement unit has no verification qualification or the testing equipment is incomplete, it can only issue a calibration certificate. This type of sound level meter cannot be used in places such as environmental monitoring, so it must be Send the sound level meter to a measurement unit with verification qualification for verification.
Precautions:
1. Do not use in high temperature and humid places.
2. Please take out the battery if it is not used for a long time to avoid electrolyte leakage and damage to the instrument.
3. The automatic range (30-130dB) is not suitable for measuring instantaneous impact noise.
4. When measuring the sound level outdoors, please install a windproof ball on the microphone head to prevent the microphone from being directly blown by the wind and causing airflow noise.
5. In order to ensure the accuracy of the measurement, calibration is required. Fit the sound level calibrator on the microphone, turn on the calibration power, read the value, adjust the sensitivity potentiometer of the noise meter, and complete the calibration.
