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微差法检定热电偶,具有允许炉温变化大(5℃),在冷端温度相等的条件下,冷端温度不用修正,检定精度主要决定于标准热电偶的精度和稳定度等优点,但测量方法要求使用0.5级电子电位差计实行自动测量,一般工厂由于缺乏条件不易实现。根据微差法原理,可算出相对误差为±0.5%的测量仪表在1000℃时,如某被检热电偶的误差为+10℃或-10℃,则因测量仪表所引起的误差只有0.05℃;如1000℃的误差为1℃时,由测量仪表引起的误差只有0.005℃。这说明可以使用较低精度
Micro-differential test thermocouple, with the allowable temperature changes (5 ℃), the cold-side temperature is equal to the conditions, the cold-side temperature without correction, test accuracy mainly depends on the accuracy and stability of the standard thermocouple, etc., but the advantages Measurement methods require the use of 0.5-level electronic potentiometer implementation of automatic measurement, the general factory due to lack of conditions is not easy to achieve. According to the principle of differential method can calculate the relative error of ± 0.5% of the measuring instrument at 1000 ℃, such as a thermocouple to be seized error of +10 ℃ or -10 ℃, then the error caused by the measuring instrument only 0.05 ℃ ; If the error of 1000 ℃ is 1 ℃, the error caused by the measuring instrument is only 0.005 ℃. This shows that lower accuracy can be used