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对于精密的电学测量,常常要考虑使用的仪表内阻对测量结果的影响,较准确地知道所使用的仪表的内阻是十分必要的;另外,调修过的仪表其内阻不可避免地会有所变动,这就需要重新测定,本文介绍一种较为准确、适用而又较简单的等值测定法。测量原理图见图。 1.先将K_1闭合,K_2打开,这时R_p不接入线路。调可调电阻R,使仪表G指针偏转一角度θ,假定此时被调定的R的阻值为R_1,则流过仪表动圈的电流 2.将K_1、K_2都闭合,这时R_p接入线路,由于其分流作用会使偏转角θ减小,这时再次调整电阻R,使仪表G的指针偏转至原先的角度θ,假定此时调定的R阻值为R_2,则此时流过仪表动圈的电流
For the precision of electrical measurement, it is often necessary to consider the influence of the internal resistance of the meter on the measurement result. It is very necessary to know the internal resistance of the meter accurately. In addition, the internal resistance of the repaired meter will inevitably Some changes, which need to be re-measured, this article describes a more accurate, applicable and simpler equivalent method. Measuring principle diagram shown in the figure. 1. First K_1 closed, K_2 open, then R_p access line. Adjust the adjustable resistance R, so that the instrument G pointer deflection angle θ, assuming the R is set at this time the resistance R_1, then flow through the instrument dynamic current 2. K_1, K_2 are closed, then R_p then Into the line, because of its shunt will make the deflection angle θ decreases, then adjust the resistance R again, so that the instrument G pointer deflection to the original angle θ, assuming the set R resistance at this time R_2, then the current Current flowing through the meter