一、引言高档的数字万用表都提供I/O接口端,如美国HP公司生产的HP3457A6位半数字万用表,配有IEEE-488接口端,可与专用的HP80或200系列微型计算机联接。由于多数单位都没有购买HP80或200计算机,因此其遥控功能无法得到使用。考虑到Apple-Ⅱ微型机在国内较为常用,而且为它而设计的7490AIEEE-488接口卡也容易购买,我们应用7490AIEEE-488接口来实现Apple-Ⅱ微型机与HP3457A数字万 First, the introduction of high-end digital multimeter provides I / O interface, such as the United States HP’s HP3457A6 half digit digital multimeter, with IEEE-488 interface, with dedicated HP80 or 200 series of micro-computer connection. Since most units do not have an HP80 or 200 computer, their remote control features are not available. Taking into account the Apple-Ⅱ microcomputer is more commonly used in the country, but also designed for it 7490AIEEE-488 interface card is also easy to buy, we use the 7490AIEEE-488 interface to achieve Apple-Ⅱ Microcomputer and HP3457A digital million