说明：  VISA（VirtualInstrumentSoftwareArchitecture）是一个独立于硬件设备、接口、操作系统、编程语言的I／O控制库，处理测控计算机与仪器间物理连接的通讯信息
(VISA (VirtualInstrumentSoftwareArchit ecture) is a hardware-independent devices, interfaces, operating systems, programming languages, I/O control library processing Control between instruments and computers to the physical communications connectivity information)