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一、概述直流电位差计(以下略去直流二字)部标(JB1390—74)对其允差的规定是用一个二项组成的式子表达。其第一项为相对项,第二项为绝对项。在电位差计对检中,按检定规程规定,标准电位差计允差应小于或等于被检的1/5。但人们考虑时,往往只着眼于相对项是否满足这一要求,而忽略了绝对项。这对末盘步进为0.1微伏的前几盘校验时,问题不大,而对后几盘(尤其是末二盘)校验时就可能成问题。因为这时相对项的绝对值已小到可以忽
First, an overview of DC potentiometer (the following abbreviation of the DC word) Ministry standard (JB1390-74) The provisions of its tolerance is expressed by a two-component formula. The first is relative, the second is absolute. Potentiometer in the seizure, according to test rules, the standard potentiometer tolerance should be less than or equal to the seized 1/5. However, when people think about it, they often only focus on whether the relative term satisfies the requirement and neglect the absolute term. This is not a problem when the last few steps of 0.1 microsecond are last checked, and may be a problem when the last few, especially the last two, are checked. Because then the absolute value of relative terms has been small enough to be negligible