Q 如何测量变频器主回路的好坏？

<p><a href="https://technology.invt.com.cn/index/pc/questiondetail.html?id=27" class="questem d-flex" style="box-sizing: border-box; font-family: 宋体, 黑体; color: rgb(0, 86, 179); text-decoration-line: none; background-color: rgb(255, 255, 255); border-bottom: 1px dashed rgb(219, 232, 238); padding: 20px 0px; font-size: 14px; text-wrap: wrap; display: flex !important;"><span class="lett" style="box-sizing: border-box; font-weight: bolder; display: inline-block; width: 18px; height: 18px; line-height: 18px; background: rgb(219, 232, 238); border-radius: 2px; color: rgb(255, 255, 255); text-align: center; margin-top: 3px;">Q</span><p class="questxt" style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; width: calc(100% - 18px); padding-left: 11px; letter-spacing: 1px; color: rgb(51, 51, 51);">如何测量变频器主回路的好坏？</p></a></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0.5rem;">用带有二极管档的数字表测量，负表笔点变频器&quot;+&quot;极，正表笔点变频器输入端子R，S，T和输出端子U，V，W；测得R，S，T端子整流桥管压降大概在0.26-0.38之间，测得U，V，W模块压降在0.3-0.38之间而且三相都平衡，反过来测，正表笔点变频器“-”极，测得的结果是一样的，表明主回路管压正常</p><p><br/></p>