本文应用虚拟仪器的原理，开发出一套经济实用的外置式虚拟信号测试仪的样机。
In this paper, a Outer virtual Instrument Measuring System consisting of signal acquisition unit and software package was developed according to the principle of virtual Instrument.
在许多测试仪中需要用标准的正弦信号检测一些物理量。
In many tester using standard need in the sine signal detection some physical quantities.
由自检信号产生电路产生自检信号实现光栅自动测试仪的自检功能。
Signals of self test realize the function of self test of the grating auto testing instrument.
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