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  • [仪表知识] 什么叫绝对误差、相对误差各引用误差? 日期:2009-11-10 17:59:44 点击:505 好评:-6

    (1)绝对误差 对同一参数进行测量时,仪表指示值x与标准表的指示值之差称为绝对误差 ,即 标准表的指示值 称作为标准值或真实值。 (2)相对误差 绝对误差的大小并不能完全精确...

  • [仪表知识] 什么叫仪表的基本误差、测量误差和附加误差?有 日期:2009-11-10 17:58:43 点击:117 好评:2

    仪表的基本误差是指在规定条件下仪表的误差。仪表在制造厂出厂前,都要在规定的条件下进行校验。规定条件一般包括环境温度、相对湿度、大气压力、电源电压、电源频率、安装方...

  • [仪表知识] IP防护等级 日期:2009-11-10 17:54:25 点击:211 好评:2

    IP分类体系通过一个数字来表明外壳对抵抗冲击和粉尘及水侵入的保护。请注意不要理解为防腐。按照IEC60529对防护级别的划分,其含义如下: 第一位数字 含 义 第二位数字 含 义 0 无防...

  • [仪表知识] 常见电子与材料术语及解释 日期:2009-11-10 17:52:12 点击:119 好评:2

    1、Admittance 导纳 指交流电路中,其电流在导体中流动的难易程度,亦即为阻抗 Impedance的倒数。 2、Aluminium Nitride(AIN) 氮化铝 是一种相当新式的陶瓷材料,可做为高功率零件急需散热的封...

  • [仪表知识] 防爆等级的划分 日期:2009-11-10 17:49:25 点击:134 好评:0

    防爆电气设备的类别,级别与温度组别(zhuantie ) 1.1 爆炸性气体环境危险区域的划分 不同的国家和地区,按各自的标准划分爆炸危险区域。我国根据爆炸性气体混合物出现的频繁程度和...

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