In order to compare the difference of sunshine duration measured by heliograph and pyranometer, the data of sunshine duration measured by heliograph and pyranometer in Nanning national basic weather station during year 2008 - 2009 was analyzed. The results showed that the difference of sunshine duration measured by heliograph and pyranometer was significant, sunshine duration measured by pyranometer was more significant than that measured by heliograph, and there were variation laws of year, month and hour in the difference of sunshine duration measured by the two instruments. Further analysis found that the main reasons caused the difference were that pyranometer was more sensitive than heliograph, and the data measured by pyranometer was moreObjective than that measured by heliograph. However, although there was a certain difference, the data measured by pyranometer was well related with that measured by heliograph. Analysis also found another reason caused the difference was that the weather conditions were different. Generally, the difference was small on the sunny day, while it was large on the cloudy day.%为了比较日照计与总辐射表在测量日熙时数上存在的差异,通过对南宁国家基本气象站2008～2009年间暗筒式日照计与总辐射表进行测量所得的日照时数资料进行统计分析,结果发现2种仪器测量所得的日照时数差异明显,总辐射表测量的日照总时数明显多于暗筒式日照计所测的,且二者的差值有明显的年、月、时的变化规律；分析发现,引起差异的主要原因是总辐射表比暗筒式日照计有更高的灵敏度,相对暗筒式日照计而言,总辐射表测量的数据更客观,虽然测值有一定的差别,但两者有很好的相关性；分析还发现,不同的天气条件也是导致两者差异的原因,一般晴好天气差别较少,多云天气差值较大.
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机译：作为基于PC的测量供应商超过20年的经验，探索ni独有的基于PC的测量的吸引力近年来，许多测量仪器制造商开始使用“基于PC的测量”这一术语。美国国家仪器公司（National Instruments，以下简称ni）是基于pc的测量市场的先驱，其为基于pc的测量提供了称为“ pc + pc接触式/插入式测量仪”的解决方案已有20多年的历史了。在这里，我们询问了基于PC的测量的吸引力，这是nl所独有的。
