1. Measuring range of teaching instrument: 40dB～130dB.
2, resolution: 0.1 dB.
3. Measurement error: ±0.1dB.
4. Display characteristics: digital and bar code display.
5, with fast and slow response switching function.
6, with A, C weighting function (A or C displayed in small characters in the middle of the right).
7, with larger value lock function.
8, with under-voltage display function (the small characters displayed in the lower left corner of the display are BAT).
9, with automatic shutdown function.
10. The refresh time of the digital display of the teaching instrument is about 160ms, and the refresh time of the chart display is about 40ms.
11, with automatic range and manual range measurement switching function (auto range display shows AUTO in the upper left corner of the display, and the manual range display displays MANU in the upper left corner of the display)
12. Teaching instrument manual range measurement group display: 40dB～70dB, 60dB～90dB, 80dB～110dB, 100dB～130dB, respectively display the lower limit.
13. In the manual range measurement state of the teaching instrument, when the measured value is less than the set lower limit, the display shows L0, when the measured value> sets the upper limit, the display shows HI, and when the measured value is within the set range Measurements.
14. The pointing characteristics of the teaching instrument should meet the requirements of the national standard GB3785 for Type II sound level meters.