校园环境噪声监测实验报告

金 华 职 业 技 术 学 院

JINHUA COLLEGE OF PROFESSION AND

TECHNOLOGY

噪声控制技术 实验报告

专 业 环境监测与减排技术 班 级 环保123 组 号 五组 组 长 冯侃 成 员 金政博

娄三元

成 绩

2014 年 6 月 27 日

实验一 校园噪声监测实验

一、实验目的：

1、训练学生独立完成环境噪声监测任务的能力； 2、使学生学会熟练声级计的使用方法；

3、训练对非稳态的无规则噪声监测数据的处理方法，对监测结果的分析和评价能力。 二、实验任务：

1、确定环境噪声监测方案； 2、对环境噪声进行监测；

3、数据处理，以合理的方式表示监测结果；

4、写出环境监测实训报告，并对环境质量进行简单评价。 三、实验地点：金华职业技术学院 四、实验组织：

将整班学生分为17组，每组3个人，一个组长。学生在指导老师的带领下进行具体操作。 五、实验内容和过程：

1、制订噪声监测方案

（1）将学校（或某一地区）划分25×25m的网格，测量点选在每个网格的中心，若中心点的位置不宜测量，可移到旁边能够测量的位置。

（2）每组3人配置一台声级计，顺序到各网点测量。

（3）读数方式用慢档，每隔5秒读一个瞬时A声级，连续读取200个数据。读数同时要判断和记录附近主要噪声来源（如交通噪声、施工噪声、工厂或车间噪声、锅炉噪声…）和天气条件。

2、数据处理

环境噪声是随时间而起伏的无规律噪声，因此测量结果一般用统计值或等效声级来表示，本实验用等效声级表示。

（1）将各网点每一次的测量数据（200个）顺序排列找出L10、L50、L90，求出等效声级Leq，再将该网点一整天的各次Leq值求出算术平均值，作为该网点的环境噪声评价量。

（2）以5dB为一等级，用不同颜色或阴影线绘制学校（或某一地区）噪声污染图。

71号点的数据 66.5 63.1 57.4 54.1 78.4 72.6 68.3 58.3 53.4 53.9 54.8 55.8 60.8 58.4 53.9 52.6 51.8 51.6 58.1 56.0 54.7 65.1 51.9 56.8 55.0 52.5 53.2 54.1 50.8 49.7 49.2 50.2 58.1 54.2 55.8 53.3 54.5 54.5 54.3 55.5 58.7 54.9 65.2 56.2 56.3 56.0 54.6 52.6 53.6 54.6 54.2 53.6 58.4 56.4 54.8 59.4 52.3 56.3 54.2 51.3 54.9 58.6 59.3 56.3 56.4 55.5 57.6 56.5 54.2 58.7 53.6 58.6 55.9 56.3 57.8 51.2 55.3 56.2 58.2 54.3 55.4 56.0 55.9 58.6 54.6 56.2 51.8 57.6 58.4 53.8 59.0 52.0 53.5 56.3 54.2 51.6 58.2 52.6 59.3 52.3 54.6 57.8 59.3 54.6 54.6 54.8 59.3 54.3 54.8 57.6 58.4 54.6 54.8 58.3 58.4 54.6 58.6 56.8 54.6 59.3 52.6 54.5 55.2 56.3 54.5 69.3 58.5 58.5 56.3 52.0 58.2 58.3 52.6 60.3

58.2

53.2

52.6

58.5

58.2

52.6

由表中数据可知：L10=62.4,L50=50.0,L90=58.1 66.3 56.3 60.1 59.5 51.8 51.2 56.1 51.2 56.2 59.1 51.2 50.3 59.8 56.3 56.3 54.2 56.5 56.4 59.0 56.8 56.0 50.3 58.2 59.9 54.1 53.2 54.3 59.3 54.6 54.6 52.8 58.3 58.0 56.4 59.3 54.3 55.2 55.3 58.6

54.5

62.4 59.1 50.3 50.0 53.2 68.7 52.4 55.0 55.5 59.3 54.3 58.2 56.3 58.6 52.3 54.6 52.0 58.4 55.8 55.8

72号点的数据 65.3 63.5 63.2 58.5 69.3 52.3 62.3 59.9 65.5 62.3 68.4 69.3 67.1 61.2 64.2 68.2 69.2 65.3 60.2 63.1 65.2 65.4 68.3 64.2 62.1 63.2 65.2 63.5 69.3 68.5 68.2 64.5 65.2 62.3 65.3 65.4 63.2 64.5 68.5 67.2 62.3 63.5 62.3 63.5 64.9 68.3 68.3 64.3 65.5 62.3 62.3 62.3 65.6 67.2 62.3 68.2 65.2 68.4 67.5 65.3 65.3 60.3 60.3 65.3 65.5 65.4 68.5 67.5 65.0 60.3 62.3 68.3 69.3 68.5 62.3 63.0 65.5 65.3 68.5 64.2 65.4 68.4 68.4 62.8 64.5 62.5 62.5 69.3 64.5 62.8 62.9 65.8 62.8 62.6 60.3 65.2 68.5 68.2 68.5 64.2 69.5 62.5 62.5 68.5 68.3 68.6 68.5 65.5 62.5 62.3 62.5 62.5 69.2 69.2 69.3 62.3 62.3 68.3 64.2 69.5 63.2 68.3 68.2 62.3 63.2 68.2 58.5 65.3 63.5 68.5 63.5 65.5 65.9 65.5

63.6

63.6

62.4

63.8

63.2

69.6

由表中数据可知：L10=56.3,L50=58.2,L90=55.0

63.8 69.2 62.5 65.5 64.1 65.2 62.3 63.2 64.2 68.3 63.2 65.3 63.3 64.5 63.3 65.2 65.3 68.4 65.3 62.3 64.2 62.3 63.8 69.8 68.3 64.5 62.3 65.2 62.5 62.3 68.1 64.5 68.4 62.3 64.2 63.5 63.5 65.5 63.3

62.5

69.1 63.5 69.4 63.2 67.6 64.5 68.7 62.5 69.3 64.3 62.5 62.8 62.5 60.5 65.8 68.2 69.5 68.5 63.5 63.5

73号点的数据 68.6 68.3 63.2 63.3 65.2 60.2 63.5 63.5 65.5 62.3 68.4 69.3 67.1 61.2 63.2 68.2 69.2 65.3 60.2 63.1 65.2 66.3 68.3 64.2 62.1 63.2 65.2 63.5 69.3 68.5 68.2 64.5 65.2 62.3 65.3 65.4 63.2 64.5 68.5 67.2 62.3 63.5 62.3 63.5 64.9 68.3 68.3 64.3 65.5 62.3 62.3 62.3 65.6 67.2 62.3 68.2 65.2 68.4 67.5 65.3 65.3 60.3 60.3 65.3 65.5 65.4 68.5 67.5 65.0 60.3 62.3 68.3 69.3 68.5 62.3 63.0 65.5 65.3 68.5 64.2 65.4 68.4 68.4 62.8 64.5 62.5 62.5 69.3 64.5 62.8 62.9 65.8 62.8 62.6 60.3 65.2 68.5 68.2 68.5 64.2 69.5 62.5 62.5 68.5 68.3 68.6 68.5 65.5 62.5 62.3 62.5 62.5 69.2 69.2 69.3 62.3 62.3 68.3 64.2 69.5 63.2 68.3 68.2 62.3 63.2 68.2 58.5 65.3 63.5 68.5 63.5 65.5 65.9 63.2

63.8

65.3

64.3

68.2

68.3

69.3

由表中数据可知：L10=64.4,L50=65.8,L90=58.7 62.3 63.5 62.5 65.5 64.1 65.2 62.3 63.2 64.2 68.3 63.2 65.3 63.3 64.5 63.3 65.2 65.3 68.4 65.3 62.3 64.2 62.3 63.8 69.8 68.3 64.5 62.3 65.2 62.5 62.3 68.1 64.5 68.4 62.3 64.2 63.5 63.5 65.5 63.2

64.5

64.2 63.5 69.4 63.2 67.6 64.5 68.7 62.5 69.3 64.3 62.5 62.8 62.5 60.5 65.8 68.2 69.5 68.5 63.5 68.3

74号点的数据 65.3 63.5 63.2 58.5 69.3 52.3 62.3 59.9 65.5 62.3 68.4 69.3 67.1 61.2 64.2 68.2 69.2 65.3 60.2 63.1 65.2 65.4 68.3 64.2 62.1 63.2 65.2 63.5 69.3 68.5 68.2 64.5 65.2 62.3 65.3 65.4 63.2 64.5 68.5 67.2 62.3 63.5 62.3 63.5 64.9 68.3 68.3 64.3 65.5 62.3 62.3 62.3 65.6 67.2 62.3 68.2 65.2 68.4 67.5 65.3 65.3 60.3 60.3 65.3 65.5 65.4 68.5 67.5 65.0 60.3 62.3 68.3 69.3 68.5 62.3 63.0 65.5 65.3 68.5 64.2 65.4 68.4 68.4 62.8 64.5 62.5 62.5 69.3 64.5 62.8 62.9 65.8 62.8 62.6 60.3 65.2 68.5 68.2 68.5 64.2 69.5 62.5 62.5 68.5 68.3 68.6 68.5 65.5 62.5 62.3 62.5 62.5 69.2 69.2 69.3 62.3 62.3 68.3 64.2 69.5 63.2 68.3 68.2 62.3 63.2 68.2 58.5 65.3 63.5 68.5 63.5 65.5 65.9 65.5

63.6

63.6

62.4

63.8

63.2

69.6

由表中数据可知：L10=60.0,L50=54.2,L90=55.1 63.8 69.2 62.5 65.5 64.1 65.2 62.3 63.2 64.2 68.3 63.2 65.3 63.3 64.5 63.3 65.2 65.3 68.4 65.3 62.3 64.2 62.3 63.8 69.8 68.3 64.5 62.3 65.2 62.5 62.3 68.1 64.5 68.4 62.3 64.2 63.5 63.5 65.5 63.3

62.5

69.1 63.5 69.4 63.2 67.6 64.5 68.7 62.5 69.3 64.3 62.5 62.8 62.5 60.5 65.8 68.2 69.5 68.5 63.5 63.5

75号点的数据 66.5 63.1 57.4 54.1 78.4 72.6 68.3 58.3 53.4 53.9 54.8 55.8 60.8 58.4 53.9 52.6 51.8 51.6 58.1 56.0 54.7 65.1 51.9 56.8 55.0 52.5 53.2 54.1 50.8 49.7 49.2 50.2 58.1 54.2 55.8 53.3 54.5 54.5 54.3 55.5 58.7 54.9 65.2 56.2 56.3 56.0 54.6 52.6 53.6 54.6 54.2 53.6 58.4 56.4 54.8 59.4 52.3 56.3 54.2 51.3 54.9 58.6 59.3 56.3 56.4 55.5 57.6 56.5 54.2 58.7 53.6 58.6 55.9 56.3 57.8 51.2 55.3 56.2 58.2 54.3 55.4 56.0 55.9 58.6 54.6 56.2 51.8 57.6 58.4 53.8 59.0 52.0 53.5 56.3 54.2 51.6 58.2 52.6 59.3 52.3 54.6 57.8 59.3 54.6 54.6 54.8 59.3 54.3 54.8 57.6 58.4 54.6 54.8 58.3 58.4 54.6 58.6 56.8 54.6 59.3 52.6 54.5 55.2 56.3 54.5 69.3 58.5 58.5 56.3 52.0 58.2 58.3 52.6 60.3

58.2

53.2

52.6

58.5

58.2

52.6

由表中数据可知：L10=48.4,L50=47.5,L90=50.1 66.3 56.3 60.1 59.5 51.8 51.2 56.1 51.2 56.2 59.1 51.2 50.3 59.8 56.3 56.3 54.2 56.5 56.4 59.0 56.8 56.0 50.3 58.2 59.9 54.1 53.2 54.3 59.3 54.6 54.6 52.8 58.3 58.0 56.4 59.3 54.3 55.2 55.3 58.6

54.5

62.4 59.1 50.3 50.0 53.2 68.7 52.4 55.0 55.5 59.3 54.3 58.2 56.3 58.6 52.3 54.6 52.0 58.4 55.8 55.8

76号点的数据 68.2 65.3 64.2 52.3 53.2 54.6 68.3 58.3 53.4 53.9 54.8 55.8 60.8 58.4 53.9 52.6 51.8 51.6 58.1 56.0 54.7 65.1 51.9 56.8 55.0 52.5 53.2 54.1 50.8 49.7 49.2 50.2 58.1 54.2 55.8 53.3 54.5 54.5 54.3 55.5 58.7 54.9 65.2 56.2 56.3 56.0 54.6 52.6 53.6 54.6 54.2 53.6 58.4 56.4 54.8 59.4 52.3 56.3 54.2 51.3 54.9 58.6 59.3 56.3 56.4 55.5 57.6 56.5 54.2 58.7 53.6 58.6 55.9 56.3 57.8 51.2 55.3 56.2 58.2 54.3 55.4 56.0 55.9 58.6 54.6 56.2 51.8 57.6 58.4 53.8 59.0 52.0 53.5 56.3 54.2 51.6 58.2 52.6 59.3 52.3 54.6 57.8 59.3 54.6 54.6 54.8 59.3 54.3 54.8 57.6 58.4 54.6 54.8 58.3 58.4 54.6 58.6 56.8 54.6 59.3 52.6 54.5 55.2 56.3 54.5 69.3 58.5 58.5 56.3 52.0 58.2 58.3 52.6 60.3

58.2

53.2

52.6

58.5

58.2

52.6

由表中数据可知：L10=64.4,L50=55.8,L90=58.7 63.3 56.3 60.1 59.5 51.8 51.2 56.1 51.2 56.2 59.1 51.2 50.3 59.8 56.3 56.3 54.2 56.5 56.4 59.0 56.8 56.0 50.3 58.2 59.9 54.1 53.2 54.3 59.3 54.6 54.6 52.8 58.3 58.0 56.4 59.3 54.3 55.2 55.3 58.6

54.5

62.4 59.1 50.3 50.0 53.2 68.7 52.4 55.0 55.5 59.3 54.3 58.2 56.3 58.6 52.3 54.6 52.0 58.4 55.8 55.8

77号点的数据 66.5 63.1 57.4 54.1 78.4 72.6 68.3 58.3 53.4 53.9 54.8 55.8 60.8 58.4 53.9 52.6 51.8 51.6 58.1 56.0 54.7 65.1 51.9 56.8 55.0 52.5 53.2 54.1 50.8 49.7 49.2 50.2 58.1 54.2 55.8 53.3 54.5 54.5 54.3 55.5 58.7 54.9 65.2 56.2 56.3 56.0 54.6 52.6 53.6 54.6 54.2 53.6 58.4 56.4 54.8 59.4 52.3 56.3 54.2 51.3 54.9 58.6 59.3 56.3 56.4 55.5 57.6 56.5 54.2 58.7 53.6 58.6 55.9 56.3 57.8 51.2 55.3 56.2 58.2 54.3 55.4 56.0 55.9 58.6 54.6 56.2 51.8 57.6 58.4 53.8 59.0 52.0 53.5 56.3 54.2 51.6 58.2 52.6 59.3 52.3 54.6 57.8 59.3 54.6 54.6 54.8 59.3 54.3 54.8 57.6 58.4 54.6 54.8 58.3 58.4 54.6 58.6 56.8 54.6 59.3 52.6 54.5 55.2 56.3 54.5 69.3 58.5 58.5 56.3 52.0 58.2 58.3 52.6 60.3

58.2

53.2

52.6

58.5

58.2

52.6

由表中数据可知：L10=63.8,L50=56.0,L90=56.4 66.3 56.3 60.1 59.5 51.8 51.2 56.1 51.2 56.2 59.1 51.2 50.3 59.8 56.3 56.3 54.2 56.5 56.4 59.0 56.8 56.0 50.3 58.2 59.9 54.1 53.2 54.3 59.3 54.6 54.6 52.8 58.3 58.0 56.4 59.3 54.3 55.2 55.3 58.6

54.5

62.4 59.1 50.3 50.0 53.2 68.7 52.4 55.0 55.5 59.3 54.3 58.2 56.3 58.6 52.3 54.6 52.0 58.4 55.8 55.8

78号点的数据 60.5 63.3 65.3 54.2 63.2 68.3 63.5 66.5 53.4 53.9 54.8 55.8 60.8 58.4 53.9 52.6 51.8 51.6 58.1 56.0 54.7 65.1 51.9 56.8 55.0 52.5 53.2 54.1 50.8 49.7 49.2 50.2 58.1 54.2 55.8 53.3 54.5 54.5 54.3 55.5 58.7 54.9 65.2 56.2 56.3 56.0 54.6 52.6 53.6 54.6 54.2 53.6 58.4 56.4 54.8 59.4 52.3 56.3 54.2 51.3 54.9 58.6 59.3 56.3 56.4 55.5 57.6 56.5 54.2 58.7 53.6 58.6 55.9 56.3 57.8 51.2 55.3 56.2 58.2 54.3 55.4 56.0 55.9 58.6 54.6 56.2 51.8 57.6 58.4 53.8 59.0 52.0 53.5 56.3 54.2 51.6 58.2 52.6 59.3 52.3 54.6 57.8 59.3 54.6 54.6 54.8 59.3 54.3 54.8 57.6 58.4 54.6 54.8 58.3 58.4 54.6 58.6 56.8 54.6 59.3 52.6 54.5 55.2 56.3 54.5 69.3 58.5 58.5 56.3 52.0 58.2 58.3 52.6 60.3

58.2

53.2

52.6

58.5

58.2

52.6

由表中数据可知：L10=61.6,L50=53.1,L90=59.8 64.2 66.2 60.1 59.5 51.8 51.2 56.1 51.2 56.2 59.1 51.2 50.3 59.8 56.3 56.3 54.2 56.5 56.4 59.0 56.8 56.0 50.3 58.2 59.9 54.1 53.2 54.3 59.3 54.6 54.6 52.8 58.3 58.0 56.4 59.3 54.3 55.2 55.3 58.6

54.5

63.5 59.1 50.3 50.0 53.2 68.7 52.4 55.0 55.5 59.3 54.3 58.2 56.3 58.6 52.3 54.6 52.0 58.4 55.8 55.8

79号点的数据 66.5 63.1 57.4 54.1 78.4 72.6 68.3 58.3 53.4 53.9 54.8 55.8 60.8 58.4 53.9 52.6 51.8 51.6 58.1 56.0 54.7 65.1 51.9 56.8 55.0 52.5 53.2 54.1 50.8 49.7 49.2 50.2 58.1 54.2 55.8 53.3 54.5 54.5 54.3 55.5 58.7 54.9 65.2 56.2 56.3 56.0 54.6 52.6 53.6 54.6 54.2 53.6 58.4 56.4 54.8 59.4 52.3 56.3 54.2 51.3 54.9 58.6 59.3 56.3 56.4 55.5 57.6 56.5 54.2 58.7 53.6 58.6 55.9 56.3 57.8 51.2 55.3 56.2 58.2 54.3 55.4 56.0 55.9 58.6 54.6 56.2 51.8 57.6 58.4 53.8 59.0 52.0 53.5 56.3 54.2 51.6 58.2 52.6 59.3 52.3 54.6 57.8 59.3 54.6 54.6 54.8 59.3 54.3 54.8 57.6 58.4 54.6 54.8 58.3 58.4 54.6 58.6 56.8 54.6 59.3 52.6 54.5 55.2 56.3 54.5 69.3 58.5 58.5 56.3 52.0 58.2 58.3 52.6 60.3

58.2

53.2

52.6

58.5

58.2

52.6

由表中数据可知：L10=64.0,L50=48.7,L90=60.1 66.3 56.3 60.1 59.5 51.8 51.2 56.1 51.2 56.2 59.1 51.2 50.3 59.8 56.3 56.3 54.2 56.5 56.4 59.0 56.8 56.0 50.3 58.2 59.9 54.1 53.2 54.3 59.3 54.6 54.6 52.8 58.3 58.0 56.4 59.3 54.3 55.2 55.3 58.6

54.5

62.4 59.1 50.3 50.0 53.2 68.7 52.4 55.0 55.5 59.3 54.3 58.2 56.3 58.6 52.3 54.6 52.0 58.4 55.8 55.8

80号点的数据 55.2 50.2 53.3 54.1 50.3 52.3 53.3 53.3 53.4 53.9 54.8 55.8 60.8 58.4 53.9 52.6 51.8 51.6 58.1 56.0 54.7 65.1 51.9 56.8 55.0 52.5 53.2 54.1 50.8 49.7 49.2 50.2 58.1 54.2 55.8 53.3 54.5 54.5 54.3 55.5 58.7 54.9 65.2 56.2 56.3 56.0 54.6 52.6 53.6 54.6 54.2 53.6 58.4 56.4 54.8 59.4 52.3 56.3 54.2 51.3 54.9 58.6 59.3 56.3 56.4 55.5 57.6 56.5 54.2 58.7 53.6 58.6 55.9 56.3 57.8 51.2 55.3 56.2 58.2 54.3 55.4 56.0 55.9 58.6 54.6 56.2 51.8 57.6 58.4 53.8 59.0 52.0 53.5 56.3 54.2 51.6 58.2 52.6 59.3 52.3 54.6 57.8 59.3 54.6 54.6 54.8 59.3 54.3 54.8 57.6 58.4 54.6 54.8 58.3 58.4 54.6 58.6 56.8 54.6 59.3 52.6 54.5 55.2 56.3 54.5 69.3 58.5 58.5 56.3 52.0 58.2 58.3 52.6 55.3

50.3

54.3

53.2

50.5

53.6

52.6

由表中数据可知：L10=51.2,L50=48.3,L90=47.8 54.2 56.3 60.1 59.5 51.8 51.2 56.1 51.2 56.2 59.1 51.2 50.3 59.8 56.3 56.3 54.2 56.5 56.4 59.0 56.8 56.0 50.3 58.2 59.9 54.1 53.2 54.3 59.3 54.6 54.6 52.8 58.3 58.0 56.4 59.3 54.3 55.2 55.3 53.3

53.2

52.3 59.1 50.3 50.0 53.2 68.7 52.4 55.0 55.5 59.3 54.3 58.2 56.3 58.6 52.3 54.6 52.0 58.4 55.8 54.2

找出L10、L50、L90，求出等效声级Leq L10 L50 L90 Leq

71 62.4 50.0 58.1 50.3

72 56.3 58.2 55.0 58.2

73 64.4 65.8 58.7 66.3

74 60.0 54.2 55.1 54.6

75 48.4 47.5 50.1 47.5

76 64.4 55.8 58.7 56.3

77 63.8 56.0 56.4 56.9

78 61.6 53.1 58.8 53.2

79 64.6 48.7 60.1 49.0

80 51.2 48.3 47.8 48.5

Leq=L50+(L10-L90)^2/60

3、对校园噪声进行简单评价

校园噪声主要是车辆开过的声音

六、实施体会

在记录时由于数字变化较快，不能很精准的记录，导致实验记录有所误差。

实验二 噪声源频谱测定

一、实验目的

1、了解学生噪声源的主要来源； 2、使学生学会熟练频谱仪的使用方法； 3、了解不同噪声的频谱特征； 4、掌握绘制频谱图的方法。

二、实验原理

除音叉等之外，各种声源发出的声音很少是单一频率的纯音，大多是由许多不同强度，不同频率的声音复合而成，统称复音。在复音中，不同频率(或频段)的成分的声波具有不同的能量，这种频率成分与能量分布的关系称为声的频谱。由于一般噪声的频率分布宽阔，在实际的频谱分析中，不需要也不可能对每个频率成分进行具体分析。为了方便，人们把20—20000Hz 的声频范围分为几个段落，划分的每一个具有一定频率范围的段落称做频带或频程。实验证明，当声音的声压级不变而频率提高一倍时，听起来音调也提高一倍(音乐上称提高八度音程)；为此，将声频范围划分为这样的频带：使每一频带的上限频率比下限频率高一倍，即频率之比为2，这样划分的每一个频程称1 倍频程，简称倍频程。为了简明，每个倍频程用其中心频率，fc 来表示：

fc?fd?fu

fu 和fd，分别为该频程的上限和下限频率。描述一个复音中，各频率成分与能量分布关系的图形称为频谱图。通常是先测定出该噪声的各频率成分与相应的声压级或声功率级，然后以频率为横坐标，以声压级(声功率级)为纵坐标进行绘图。目前大部分声级计都具有频谱分析的功能，能够把监测值传送到计算机上并绘制出频谱图。使用噪声测量虚拟仪器声级计联机绘制的频谱图如图1.3所示。频谱图的横坐标显示倍频程的中心频率：63，125，250，500，1000，2000，4000，8000Hz。纵坐标显示外部环境的声级dB。

/图1 频谱仪

三、测量方法

将班级分组，每3人一组。一个组长。学生在指导老师的带领下进行具体操作。要求组内每位同学选择2中不同类型的噪声源进行测定。

打开仪器电源，进入测量子菜单，用▲▼调节光标，按下“启动/暂停”键，是菜单中跳动的“run”停止闪烁，开始测量。移动光标到31.5Hz，再接下去是63 Hz,125 Hz,250 Hz,500 Hz,1000 Hz,2000 Hz,4000 Hz,8000 Hz。由于滤波要有一定的稳定时间，所以每个中心频率点要有8s左右的停留时间，所有中心频率点测量完成后，按“打印”键，然后回按，记录数据，剩下几个噪声源重复同样操作。 四、数据处理 1、记录数据

根据不同的噪声源，记录数据。

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