绘制频率特性和极坐标图的尺度和大小

[中文适用范围]： 本文件规定了以分贝表示的对数或电平特性相对于对数频率轴的标准纵横比以及极坐标电平图的半径范围。应用包括硬拷贝打印输出、电子文件（如PDF文件）、科学出版物、计算机程序和应用程序中的屏幕显示以及标准中的图表。符合本文件要求的图表示例见附录A。虽然不在本文件范围内，但具有线性y轴与对数频率的图表（例如相位、群延迟等）通常伴随着本文件规范性部分中描述的标准纵横比电平图表。这些在资料性附录B中描述。 [外文原描述]： IEC 60263:2020 specifies standard aspect ratios for logarithmic or level characteristics expressed in decibels versus a logarithmic frequency axis and ranges for the radius of polar diagrams of level. Applications include hard copy printouts, electronic files (e.g., PDF files), scientific publications, screen displays in computer programs and apps, as well as graphs in standards. Informative examples of graphs that conform to the requirements in this document are found in Annex A. Although outside the scope of this document, graphs with a linear y-axis versus logarithmic frequency (e.g., phase, group delay, etc.) often accompany the standard aspect ratio graphs of level described in the normative part of this document. These are described in informative Annex B. IEC 60263:2020 cancels and replaces the third edition published in 1982. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) the scope is expanded to include electronic files (e.g., PDF), scientific publications, graphs in other standards, and screen displays in programs and apps; b) a Terms and Definitions clause has been added; c) aspect ratios of 20 dB/decade, and 0,5, 1, 1,25, and 2,5 decades/decade have been added; d) ranges of 60 dB or 30 dB are specified for polar plots of absolute level; a 30 dB range is specified for polar plots of relative level; e) as most graphs are now computer generated, tolerances and sizes have been removed; f) all informative figures have been updated with contemporary examples; g) an informative annex with information about linear y-axis vs. logarithmic frequency has been added.