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class="show">阅读模式</a> </div> </div> </div><div class="pct"><style type="text/css">.pcb{margin-right:0}</style><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_285267"> 原文：DC voltage measurement<br /> 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.<br /> <br /> 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.<br /> <br /> 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.<br /> <br /> 译文：直流电压<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测量</a><br /> 固体状态设备总是以直流和电压为动力。真空<a href="http://electronic.oecr.com" target="_blank" class="relatedlink">电子</a>管也要求以直流电压为电源。这样许多测量是采用直流模式的。许多系统现在都内装诊断仪以便电能供应参数能被监测和记录。<br /> <br /> 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)。这种精度经常用于低电压范围(一般在300 V以下)；对于更高的电压精确性可能稍微差点。<br /> <br /> 此处的要点是仔细地阅读仪器说明书，如果说明书上没有详细的说明，可与仪器制造商技术支持部门联系。<br /> <br /> 更多英中对照请点击：http://www.greatleo.com/show.aspx?id=121&cid=11</td></tr></table> </div> <div id="comment_285267" class="cm"> </div> <div id="post_rate_div_285267"></div> </div> </div> </td></tr> <tr><td class="plc plm"> <div 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