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运行中的多点打印电子自动平衡电桥因滑线电阻磨损较快,示值易超差且不易及时发现。我们利用仪表空余的测量点监测仪表的工作状况,可及时发现上述故障。方法如下: 按不影响仪表其它测量点示值的某主刻度线相应的名义电阻值,用锰铜丝在胶木骨架上绕制(双线并绕)一固定电阻,老化后其阻值用不低于0.05级的电桥测量、调整准确,其偏差对分度号Pt 10的仪表应小于仪表允许基本误差值的1/5,对分度号Pt 100、Cu100和Cu50的仪表应小于仪表允许基本误差值的1/10。
Multi-point printing operation in the automatic balance bridge due to wear resistance of the sliding resistance faster, indicating the value of ultra-easy and not easy to find. We use the measuring point of the instrument to monitor the working condition of the instrument, which can be found in time. The method is as follows: According to the meter does not affect the other measurements indicate the value of a major graduation mark the corresponding nominal resistance, with Manganese copper wire in the bakelite frame wound (double and around) a fixed resistance, the resistance after aging with The measurement of the bridge below 0.05 level should be adjusted accurately. The deviation should be less than 1/5 of the basic allowable error for indexing Pt 10, and should be less than the allowable value of gauge 100 for Pt 100, Cu100 and Cu50 The basic error of 1/10.