NWBM85D008
NWBM85D008
NWBM85D008
对电工指示仪表的技术要求除了足够的推确度和适当的灵敏度外,还有下述一些要求:
(1)仪表本身消耗功率小:仪表接入电路时,本身也要消耗一定的能量。如果仪表消耗的功率大,必将改变电路原有的工作状态,从而造成不能允许的测量误差。因此,仪表本身消耗的功率应尽量小。从节约电能的角度来考虑,选用仪表时应尽可能选择低功耗仪表。
(2)有良好的读数装置:仪表的标尺刻皮应尽量均匀,以便于读数,并扩大仪表在阅量时的工作范围。对于刻度不均匀的标尺,应标明读数起点,并用符号“.”表示。
(3)有良好的阻尼:要求仪表的阻尼良好,就是要求阻尼时间短。阻尼时间是指仪表从接入被测旦开始,到指针在稳定位置左右的摆动不大于标尺全长的1%为止的时间。一般要求仪表的阻尼时间不过46。质量较好的仪表,阻尼时间只有1.5s左右。
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