主题：寻找助听功能HAC受话器磁感应测试配件

此主题相关图片如下：003.jpg


这种怎样?

什么是HAC测试？
手机和助听设备同时使用时会产生相互干扰，因此，联邦通信委员会（FCC）要求测试手机和助听设备的兼容性，使用助听的两种模式：microphone模式和telecoil模式的兼容性都需测量， FCC设定等级以计算干扰的风险：
M rating指 microphone模式
T rating指 telecoil模式
美国国家标准局（ANSI）在2001年采用ANSI C63.19标准，根据联邦通信委员会（FCC）的规定，每个厂商所生产的大部分手机都必须符合HAC兼容（M3-4和T3-4）。

如何定义HAC?
HAC rating测试分为两步：
RF 测试（HA microphone 模式）：使用E场和H场的微型探头测试手机所发出的近场的电场和磁场。
音频测试（HA telecoil 模式）：测试使用T线圈探头测试手机所发出的磁场

文件编号:	IEEE Std (ANSI) C63.19:2007
参考名称:	Methods of Measurement of Compatibility Between Wireless Communication Devices and Hear ring Aids IEEE C63.19 , ANSI C63.19 , ANSI-C63.19

此标准不知谁有?

The Working Group will maintain the HACTS document. This document is a composite
of the wireless manufacturers/labs test efforts based the latest version of the C63.19
standard. Attached to this specification as an appendix is the C63.19 standard reflecting
the most recent changes initiated by the Working Group. Changes made to the HACTS
document are tracked and given to the IEEE C63.19 Working Group as a contribution for
change. Future changes to the standard will result from lessons learned during the round
robin test efforts and implemented in the HACTS document using the fast track process.

Elimination of the simulated ear in T-coil test process: The C63.19 standard
was based on the work that had been done on landline phones. A landline phone is
sealed against the ear when in use. Thus, a sealed ear was specified in performing
the T-Coil test. Wireless phones do not typically seal to the ear when in use and
the use of the sealed ear in the T-coil test was inducing errors. There are at least
four (4) different types of simulated ears that could be needed to match the
different types of wireless devices. The Working Group members came up with
an alternative test method that eliminates the need for simulated ears in the T-coil
test. The new method is far less error prone than the old method and should result
in a more consistent T-coil test. This change has subsequently been accepted in
the latest version of the C63.19 standard.

看到过三维的测试图,可惜找不到原文了.

磁场H的分布,是三维的,跟距离和方向都有关系,且不成线性关系.