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众所周知,使用0.05级低电阻电位差计检定配热电偶的动圈仪表时,毫伏发生器的内阻要求小于5Ω,才能忽略断偶保护线路所产生的附加误差。毫伏发生器内阻对测量精确度影响的原因是:检定时,用毫伏发生器代替热电偶,当内阻和热电偶的电阻不同时,断偶线路对毫伏发生器和热电偶的作用也就不同,从而产生了附加误差。
It is well-known that the millivolt generator’s internal resistance requirement of less than 5Ω when using a 0.05-level low-resistance potentiometer to verify a moving coil gauge with a thermocouple ignores the additional error generated by the broken-even protection line. The reason why the millivolt resistance affects the measurement accuracy is that when the test is performed, the millivolt generator is used instead of the thermocouple. When the resistance between the internal resistance and the thermocouple is not the same, the broken line is sensitive to the millivolt generator and the thermocouple The role is different, resulting in additional error.