采用数字式电压表检定指针式电压表时,根据检定规程JJG124-82第40条规定:“在检定之前数字式电压表要选择合适的量限,当检定仪表上限时,对于0.1、0.2及0.5级仪表及其读数不应小于5位”。从该规程中表10中查得,被检仪表的准确度级别为0.5级,则检定被检仪表的测量上限时,数字电压表的实际误差要求≤0.1％。下面举例说明,如何应用上述原则。 The use of digital voltmeter test pointer voltage meter, according to test procedures JJG124-82 Article 40 states: “Before the test digital voltmeter to choose the appropriate amount of limit, when the instrument limit test, for 0.1,0.2 and 0.5 Level meter and its reading should not be less than 5 ”. From the procedure in Table 10 found that the level of accuracy of the seized instrument was 0.5 level, then test the upper limit of the measured instrument, the actual error of the digital voltmeter ≤ 0.1%. The following examples illustrate how to apply the above principles.