Are Engineering Change levels and calibration dates clearly called out on all gages?
工程变化水平和定标日期清楚地被召集在所有测量仪？
Acoustics - Reference zero for the calibration of audiometric equipment - Part 1 : reference equivalent threshold sound pressure levels for pure tones and supra-aural earphones.
声学。测听设备校准用参照区。第1部分：纯音和耳挂式耳机的参考等效阈声压级。
In this paper, errors of digital levels are introduced. Calibration methods of the collimation error and the system accuracy are presented.
分析了数字水准仪系统的误差源，阐述了仪器i角误差和综合精度的检定方法。
In this paper, errors of digital levels are introduced. Calibration methods of the collimation error and the system accuracy are presented.
分析了数字水准仪系统的误差源，阐述了仪器i角误差和综合精度的检定方法。
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