标准名称：	金属韦氏硬度计(试行)
英文名称：	Verification Regulation of Metallic Webster Hardness Testing Machine
中标分类：	综合 >> 计量 >> 力学计量
发布部门：	国家质量技术监督局
发布日期：	1999-05-06
实施日期：	1999-09-01
首发日期：
作废日期：
归口单位：	全国力值硬度计量技术委员会
起草单位：	兵器工业四二三区域计量站、中国计量科学研究院
起草人：	杨辉其、顾玉骐、梁廷伟
出版社：	中国计量出版社
出版日期：	2004-04-22
页数：	11页
书号：	155026-1065

本规程适用于新制造、使用中和修理后的测量范围为（0~20）HW的金属韦氏硬度计的检定。

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MIL-STD-188/140, MILITARY STANDARD: EQUIPMENT TECHNICAL DESIGN STANDARDS FOR COMMON LONG HAUL/TACTICAL RADIO COMMUNICATIONS IN THE LOW FREQUENCY BAND AND LOWER FREQUENCY BANDS (03 APR 1981)., This standard establishes minimum performance requirements in the form of Technical Design Standards and Design Objectives (DO) that will ensure interoperability of future radio subsystems equipment in the VLF and LF bands. Performance requirements for experimental or developmental extremely low frequency (ELF and ultra low frequency (ULF) are not addressed. The frequency ranges of military communications equipment have been established as a result of band characteristics which do not necessarily depend upon administrative or technical frequency band definitions. For example, in the area of the electromagnetic spectrum above ELF, that portion of application to military broadcast communications is found between 14 kHz and 200 kHz. This portion in fact extends into both the VLF adn LF bands. Efficient use of the limited bandwidth available at these lower frequencies precludes most analog modulation techniques. This standard, therefore applies primarily to those radio communications equipment and systems which are involved in the transmission of single and multi-channel teletypewriter, data and facsimile information.