T/ZGWJHXH 58-2023 Active

Main technical content: This document specifies the terms and definitions, test items, test conditions, measurement of sound power level, measurement of radiation sound pressure level, recording, measurement uncertainty, and reporting for the engineering method (Level 2) of noise measurement for pneumatic leg rock drills. This document is applicable to noise measurement for pneumatic leg rock drills powered by compressed air. The sound level meter shall comply with the provisions of GB/T 3785. Other measurement instruments with equivalent accuracy may also be used. The sound level meter or other measurement instruments can be connected to the microphone by an extension cable or an extension rod. Before and after each measurement, the entire measurement system (including the cable) shall be calibrated at one or several frequencies using a sound level calibrator with an accuracy of not less than ±0.5 dB. The calibration instrument should use a piston sounder or other calibrator. The sound level calibrator shall be regularly inspected in accordance with the requirements of JJG 176. The sound level meter or other measurement instruments shall be regularly inspected in accordance with the requirements of JJG 188.