在设计数据采集系统之前，我们应首先确定是否要使用传统仪器，如万用表。
One of the first things you should decide when designing your data acquisition system is whether you're going to use traditional external instruments, such as a multimeter.
SCPI命令是可编程仪器的标准指令，HP33120A函数发生器与HP34401 A数字万用表等程控仪器对其具有兼容性。
SCPI order is the standard instruction of programmable instrument. The programmable control instruments of HP33120A Function Generator and HP34401A Multimeter and so on have compatibility to it.
一台典型的直流台式数字万用表的精度可以达到0.002%（一种6 1/2 数字仪器的一个读数）。
Accuracies of a typical DC bench-type digital multimeter can be as good as 0.002 percent (1 count of reading for a 6 1/2 digit instrument).
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