Is it useful to only issue a calibration certificate for a sound level meter?
Sound level meters that only issue calibration certificates are generally invalid because the calibration certificates only issue basic data reports, and the reports issued cannot cover all required inspection items, so it is impossible to judge the accuracy level of the instrument based on the data in the calibration report or even impossible. Determine whether the sound level meter is qualified. Without knowing whether the accuracy level of the sound level meter is qualified, the risk of using the sound level meter casually is very high. Only sound level meters that have issued a calibration certificate and reached a qualified conclusion and accuracy level can be used normally.
Sound level meters are mandatory calibration measuring instruments. If the calibration agency only issues a calibration certificate or test report, it means that the performance indicators of the sound level meter cannot meet the requirements of GB/T 3785.1-2010 (IEC 61672-1:2013). According to the calibration regulations JJG 188-2017 failed the test.
Another situation is that the sound level meter itself is qualified, but if the measurement unit does not have verification qualifications or has insufficient testing equipment, 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 The sound level meter must be sent to a measurement unit with verification qualifications for verification.
Precautions:
1. Please do not use it in high temperature or humid places.
2. Please remove the battery if not used for a long time to avoid electrolyte leakage and damage to the instrument.
3. The automatic gear (30-130dB) is not suitable for measuring instantaneous impact noise.
4. When measuring sound levels 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. To ensure the accuracy of measurement, calibration is required. Fit the sound level calibrator to the microphone, turn on the calibration power, read the value, adjust the noise meter sensitivity potentiometer, and complete the calibration.
