对数功能块已广泛在测井仪器中使用。了解它的误差来源对提高对数功能块的性能是很有必要的。而且评价一个对数功能块的质量,即它的误差计算更是使用者关心的问题。过去,计算对数功能块的误差采用作图办法,即在单对数坐标纸上画输入—输出转换函数曲线,再从图上计算误差,这既浪费大量时间,又十分麻烦。本文介绍用查图表的办法来估算对数功能块的误差,节约了时间,保证了精度,想必对使用者是有帮助的。 Logarithmic function blocks are widely used in logging tools. Understanding its source of error is necessary to improve the performance of a logarithmic function block. And to evaluate the quality of a logarithmic function block, that is, its error calculation is a concern of the user. In the past, the error of the logarithmic function block was plotted by plotting the input-output transfer function curve on a logarithmic graph paper and then calculating the error from the graph, which wastes a lot of time and is very troublesome. This article describes the use of check chart method to estimate the logarithmic function block error, saving time, to ensure the accuracy, presumably to the user is helpful.