CAJ | 학술논문

温漂和时漂对脉宽调制式电子分析天平示值影响较大且难以区分,分析了永磁体剩磁、动圈长度、恒流源采样电阻、电子元件参数等温漂和时漂影响机理,考虑电磁力平衡传感器各特征位置温度变化及内外温度梯度影响,建立了温漂与温度变化的二次多项式、与温度梯度的近似线性关系以及时漂与时间的指数关系,通过叠加得到示值漂移非线性混合补偿模型,并设计了一种能够同时辨识温漂和时漂模型参数的空载和满载组合漂移实验和数据处理方法,通过大量非均匀温度变化实验得到模型参数,利用该模型对量程220 g、分辨力0.1 mg的电子分析天平进行补偿验证。结果表明,补偿后的天平加载220 g并保持30 min后的示值漂移小于1 mg,零点示值漂移小于0.5 mg,满足国家标准《JJG1036-2008电子天平检定规程》规定的I级天平对温漂和时漂性能指标要求。
온표화시표대맥관조제식전자분석천평시치영향교대차난이구분,분석료영자체잉자、동권장도、항류원채양전조、전자원건삼수등온표화시표영향궤리,고필전자력평형전감기각특정위치온도변화급내외온도제도영향,건립료온표여온도변화적이차다항식、여온도제도적근사선성관계이급시표여시간적지수관계,통과첩가득도시치표이비선성혼합보상모형,병설계료일충능구동시변식온표화시표모형삼수적공재화만재조합표이실험화수거처리방법,통과대량비균균온도변화실험득도모형삼수,이용해모형대량정220 g、분변력0.1 mg적전자분석천평진행보상험증。결과표명,보상후적천평가재220 g병보지30 min후적시치표이소우1 mg,영점시치표이소우0.5 mg,만족국가표준《JJG1036-2008전자천평검정규정》규정적I급천평대온표화시표성능지표요구。
Temperature drift and time-varying drift have great effects on PWM electronic analytical balance indication and can not be easily distinguished. In this paper, the temperature and time drift mechanism is analyzed, which includes permanent magnet residual magnetism, movable coil length, constant current source sampling resistor and electronic component parameters. The im-pact of multi-point temperature changes and temperature gradient of the electromagnetic force balance sensor are considered;the quadratic polynomial of temperature drift vs. temperature change, the approximate linear relation between temperature drift and temperature gradient, and the exponential relation between time drift and time are established;and a nonlinear hybrid compensation model of the balance indication drift is obtained through superimposition. Drift experiment and data processing method were de-signed that could identify the parameters of the model simultaneously;the model parameters were obtained through various uneven temperature changing experiments. This model was used to conduct the compensation verification on the electronic analytical bal-ance with capacity of 220 g and resolution of 0.1 mg, experiment results show that when the balance is loaded with 220g and after operating for 30 min, its full-drift is under 1mg, zero-drift is under 0.5mg, which well satisfies the temperature and time drift per-formance requirement of 1st class electronic balance defined in the Chinese National Standard,“JJG1036-2008 Verification Regu-lation for Electronic Balance”.