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§11—1 用替代测量法消除定值系统误差替代测量法就是在其它测量条件不变的情况下,用某一已知量替代被测量以达到消除定值系统误差的一种测量方法。替代测量法可应用于质量的测量(见§6—4),也可用在以交流电桥作精密测量工作中。这时,可先使电桥与接入电路的被测的量达到平衡,然后用其一已知的量替代被测的量,使电桥再次达到平衡。如果这种替代在电桥内没有引起任何其它变化的话,几乎可以全部地消除由一系列因素(例如电流、电容、电感等)所造成的定值系统误差。
§11-1 Elimination of Fixed-Point System Error by Alternative Measurement An alternative measurement method is to use a known quantity instead of the measured quantity to eliminate the error of the set-point system when the other measurement conditions are the same. Alternative measurements can be applied to quality measurements (see §6-4), and can also be used in precision measurement with AC bridges. At this point, the bridge and the access circuit can be measured first to achieve a balance, and then use a known amount to replace the measured amount, so that bridge again to balance. If this alternative does not cause any other changes in the bridge, it can almost eliminate the set point systematic errors caused by a series of factors (such as current, capacitance, inductance, etc.).