This method is similar to the current-reversal method except that the measurements are alternated between a fixedsource current and zero current.
这种方法和电流反向法类似，只是这种方法在固定的源电流和零电流之间交替进行测量。
2
Based on the calculation of annual fixed expenditure and annual running cost, compares some heat and cold source schemes with annual current expenditure method.
用年经常费用法对几种冷热源方案的年固定费用和年运行费用进行了计算比较。
3
The flow chart of the 3D inversion of anomalous data of fixed loop source TEM survey has also been given. A test inversion result of forward modeling data show that the method is effective.