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直流毫伏发生器是检定测温毫伏计与动圈式温度指示调节仪(动圈仪表)必不可少的专用检定设备。检定规程JJG187-78对使用的检定设备—调压箱(即毫伏发生器)规定:“当检定带断偶保护装置的仪表时,输出阻抗应小于5Ω”。由于对毫伏发生器精确度要求不高,线路结构简单,一直被大家忽视。有些仪表检修人员在检定动圈仪表时不用毫伏发生器,而用直流电位差计直接输入给动圈仪表,就是采用了也没有考虑毫伏发生器的输出阻抗,给检定带来了一定的测量误差。
DC millivolt generator is the test temperature millivoltmeter and moving coil temperature indicator regulator (moving coil meter) is essential for special verification equipment. Verification procedures JJG187-78 for the use of test equipment - surge tank (ie millivolt generator) states: “When testing with broken protective device instrument, the output impedance should be less than 5 ”. As the millivolt generator accuracy is not high, the line structure is simple, has been overlooked. Some instrument maintenance personnel check the moving coil instrument does not have millivolts generator, but with direct current potentiometer directly into the moving coil instrument, that is, also did not take into account the output impedance of millivolt generator to bring a certain amount of test Measurement error.