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ICS_17.140. 01 A 59 中华人民共和国国家标准 GB/T 7341.2—1998 idt IEC 645-2:1993 听力计 第二部分:语言测听设备 Audiometers Part 2:Equipment for speech audiometry 1998-05-08发布 1998-12-01实施 国家质量技术监督局发布 GB/T 7341.2—1998 目 次 IEC前言 引言 范围与目的 引用标准 定义 总要求 规定听力计类型的最低要求 对语言听力计作规格、测试及校准的参考条件 信号电平指示器 8对语言信号输出级的控制 输出声压级与振动力级 10频率响应 11 谐波失真· 12 信噪比… 13 掩蔽声· 14 监听耳机或监听扬声器· 15 对讲系统 16 阻断开关 17标志及操作说明书 附录A(提示的附录) 某些常用耳机的自由场等效输出修正数
GB-T 7341.2-1998 听力计 第2部分 语言测听设备
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