Introduction of Several Typical Sound Level Meters
1. Integral sound level meter - it can directly display the equivalent continuous sound level of the measured noise within a certain measurement time in digital form. For unsteady noise, it is required to measure the equivalent continuous sound level Leq of the noise, which is defined as: at a certain point in the sound field, use the method of energy averaging within a certain period of time to combine several different A sound levels that change intermittently , using an A sound level to represent the noise level during this period.
2. Digital sound level meter - a sound level meter with digital display of measurement results. It not only has the advantages of intuitive and accurate readings, but also can be processed with other analysis and processing instruments and computers through BCD code output.
3. Impulse sound level meter - measure the effective value of the measured signal through the pulsation characteristics of the capacitance at different times, and has a high peak factor capacity, so it can respond to the pulse sound with a short duration and a low repetition ratio . In life, we often encounter discontinuous noise, that is, pulse sound or impact sound, such as typewriter noise, stamping machine noise, guns and so on. This noise is short-lived, may recur for a long time, or even occur only once in a period of time. If it is measured with a general sound level meter, there will be a large error, so a pulse sound level meter should be used.
4. Environmental automatic monitoring (noise statistics, spectrum) analyzer - can automatically collect and calculate noise data according to preset functions, and directly display the results (and store the data at the same time).
Calibration method of sound level meter
1. After turning on the sound level meter, there will be four options of measurement, setting, reference, and calibration. The last option is the calibration option. Just move the cursor to this option.
2. After entering the calibration page, there will still be four options, which are review, calibration, application, and modification. Put the cursor on the second option calibration option, and then select the calibration option.
3. Insert the sensor of the sound level meter into the upgraded calibrator, and then turn on the switch of the calibrator, the calibrator will emit a standard sound level, and when everything is ready, press the calibration to start, and the instrument can be automatically calibrated.
4. When the data displayed by the sound level meter reaches 93.8dB (A), the instrument is calibrated.
