标题: 直流电压测量（英中对照） [打印本页] 作者: 琉璃公社 时间: 2005-11-24 01:07 标题: 直流电压测量（英中对照） 原文：DC voltage measurement
Solid-state devices are always powered by direct currents and voltages . Vacuum tubes require DC voltage sources as well. Thus many measuremtents are made in the DC mode. Many systems today have built-in diagnostic meters so that power supply parmeters can be monitored and logged.
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). This accuracy is often available on the lower voltage ranges usually below 300 V；for higher voltages accuracies may be slightly worse.
The point here is to read the instrument’s specifications carefully, and if things are not clearly spelled out, contact the instrument manufacturers’ application. engineering department.