The utility model discloses an electricity meter. A photoscope with the magnification function is installed on a view window at the corresponding position of an indicating dial.
本实用新型公开了一种电表，指示盘的相应位置处的视窗上安装有具有放大功能 的透视镜。
When viewing extended objects, the apparent brightness seen in the eyepiece is a function only of aperture and magnification, it is not related to focal ratio.
当观察扩展光源时，目镜中所看到的亮度只跟孔径和放大率有关，它跟焦比并没有关系。
Based on the torsional displacement transfer function of the asymmetric structure with MTMD, the analytical expression is developed for the torsional displacement dynamic magnification factor.
基于导出的设置MTMD时非对称结构扭转角位移传递函数，建立了扭转角位移动力放大系数解析式。
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