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1.时间 技术指标中通常包含时间的指标.设定时间间隔或校准间隔是基于对仪器内模拟电路漂移的考虑.这个核准间隔用来衡量一个仪器保持其指标的能力如何.实际中使用的时间间隔有30、 90、180和360天.很明显,不能用某台仪器30天的指标和另一台仪器360天的指标进行比较.对于Fluke 700系列校准器校准间隔是一年和二年.2.温度 指标中的温度范围也是非常重要的.它考虑了仪器中模拟电路的温度系数.常用的温度范围是23℃士5℃.这个范围反映了大部分实际的使用情况.超过了温度范围,就要用温度系数来对精度指标的下降程度进行描述.修正因数T_(MOD)=|TC×△t|,TC为温度系数;△t是使用环境的实际温度减去给定的温度限.总精度=(温度范围内的基本精度)+T_(MOD).例如,假设一个精度为0.03%的校准器,它的温度系数(TC)为0.002%/℃.该仪器在32℃的环境中使用时:t=32,限制范围=23+5=28℃,T_(MOD)=0.0025%|32-28|=0.0025%|4|=0.01%,最后的精度=0.03 %+0.01=0.04%.
1. Time The technical indicator usually includes the indicator of time. Setting the time interval or calibration interval is based on the consideration of the analog circuit drift in the instrument. The approval interval is used to measure the ability of an instrument to maintain its specifications. The intervals are 30, 90, 180, and 360 days, and it is clear that you can not compare the 30-day metric for one instrument to the 360-day metric for another instrument. The calibration interval for Fluke 700 Series calibrators is one year and two years. 2. The temperature range in the temperature indicator is also very important. It takes into account the temperature coefficient of the analog circuit in the instrument. The typical temperature range is 23 ° C ± 5 ° C. This range reflects most of the real world usage. Exceeds the temperature range , It is necessary to use the temperature coefficient to describe the degree of decline of the accuracy index.The correction factor T_ (MOD) = | TC × △ t |, TC is the temperature coefficient; △ t is the actual temperature of the environment minus the given temperature limit For example, assume that a calibrator with a precision of 0.03% has a temperature coefficient of (TC) of 0.002% / ° C. The instrument operates at 32 ° C In use: t = 32, the limit range = 23 +5 = 28 ° C, T_ (MOD) = 0.0025% | 32-28 | = 0.0025% | 4 | = 0.01%, final accuracy = 0.03% + 0.01 = 0.04%.