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 The distribution characteristics and laws of underground current for a change current system with the opposite direction are indicated in this paper. Secondly, anomalous formulations of the apparent resistivity in resistivity method with the opposite change current system are given, and a relation between the array factor and the allotment current factor is calculated, its laws and significance are showed by the results of calculations. Finally, as examples, the anomalous laws of the... The distribution characteristics and laws of underground current for a change current system with the opposite direction are indicated in this paper. Secondly, anomalous formulations of the apparent resistivity in resistivity method with the opposite change current system are given, and a relation between the array factor and the allotment current factor is calculated, its laws and significance are showed by the results of calculations. Finally, as examples, the anomalous laws of the apparent resistivity in electrical sounding method with the opposite change current system of level layers and spheres are analysed, as well as the significance for exploration is pointed out.  本文阐明了反向变分流系统地下电流的分布特点和规律。文中还给出了反向变分流电阻率法视电阻率的异常表达式,计算了装置系数和电流分配系数之间的关系,并阐明其规律和作用。最后,作为一个例子,分析了水平地层上反向变分流电测深法视电阻率的异常分布规律,并指出它在勘探中的作用。  The effect of medium of the earth at different positions to the measurement of frequency electromagnetic sounding with dipoledipole array is analysed. It is pointed out that when frequency sounding profiling is carried out under the complex geological condition, parallel dipole array with the current electrodes fixed and the potential electrodes moving along the profile is appropriate, and the data should be recorded at the middle point of the potential electrodes. Relatively large current electrode spacing... The effect of medium of the earth at different positions to the measurement of frequency electromagnetic sounding with dipoledipole array is analysed. It is pointed out that when frequency sounding profiling is carried out under the complex geological condition, parallel dipole array with the current electrodes fixed and the potential electrodes moving along the profile is appropriate, and the data should be recorded at the middle point of the potential electrodes. Relatively large current electrode spacing may be used to get strong signal and small potential electrode spacing may be adopted to acheive high resolution. The array coefficient expression for parallel dipole array with large current electrode spacing is derived.  分析了大地中不同位置的介质电性对赤道偶极装置频率电磁测深结果的影响，指出在复杂地质条件下作剖面性频率电磁测深，宜采用固定供电电极位置，只移动测量电极的平行电极装置，将测量电极中点定为纪录点；采用较大的供电极距以获得较强的测量信号和较小的测量极距以获得较高的横向分辨率。推导了有限长供电极距的平行电极装置的装置系数公式。  Analyzing reasons for system errors in measurement of earth resistivity, several methods to remove the errors are proposed. It's believed that the system errors are influenced by the accuracy of setting coefficient K,sampling resistor R I and measured ΔV and V R I .The R I with high precision and stability is chosen,the "suspending" measurement is applied and the same A/D converter with wide dynamic range and high linearity is used to measure Δ V and V R I in developed terrameter... Analyzing reasons for system errors in measurement of earth resistivity, several methods to remove the errors are proposed. It's believed that the system errors are influenced by the accuracy of setting coefficient K,sampling resistor R I and measured ΔV and V R I .The R I with high precision and stability is chosen,the "suspending" measurement is applied and the same A/D converter with wide dynamic range and high linearity is used to measure Δ V and V R I in developed terrameter by the authors for decrease of the system errors.At last,effect of the "suspending" measurement is verified by test in laboratory.  从地电观测的基本原理出发 ,分析了系统误差产生的原因 .认为系统误差的大小决定于装置系数K值、取样电阻RI 及测量ΔV和VRI 的准确度 .在地电仪中选用高精度、高稳定性的RI,采用“浮空”测量法及采用同一个动态范围大、线性度高的A/D转换器测量ΔV和VRI,可以减小地电阻率观测的系统误差 .最后通过实验验证了“浮空”测量法的效果 .  
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