Virtual instrument system used for field electrical test generally consists of signal conditioning units (SCU), data acquisition devices and a computer.

用于现场电气试验的虚拟仪器系统，一般由信号调理装置、数据采集卡和计算机组成。

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A metric system of measurement units based upon the meter (length), gram (weight), second (time) and amperes (electrical current).

基于米(长度)、克(重量)、秒(时间)和安培(电流)的一种测量单位公制系统。

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But other companies, such as units of United Technologies and other vendors, contribute to the plane's extensive electrical system.

CNN: Quick fix for Dreamliner looks less likely, experts say