const searchPopup_search_default = document.getElementById('search-default-content');const searchInput_search_default = document.getElementById('search-default-input'); // 监听实例的弹窗显示状态变化 const observer_search_default = new MutationObserver(() => {// 当弹窗从隐藏变为显示时，执行当前实例的输入框聚焦 if (searchPopup_search_default.style.display !== 'none' && !searchPopup_search_default.hidden) {searchInput_search_default.focus(); // 核心聚焦方法 // 可选：聚焦后选中输入框内内容，方便直接替换（按需开启） // searchInput_.select(); observer_search_default.disconnect(); // 聚焦一次后断开，避免重复触发 }}); // 启动当前实例的监听，仅监听自身弹窗的属性变化，各实例完全独立 observer_search_default.observe(searchPopup_search_default, {attributes: true,attributeFilter: ['style', 'hidden', 'class'] // 仅监听关键属性，性能最优 });

differential mode interference

Definition:

Differential mode interference: the amplitude of the interference current on the two wires is equal and in the opposite direction is called differential mode interference.

Differential mode interference current schematic

Differential mode interference current schematic

When a differential mode interference current passes through a conductor, it will produce adifferential mode voltageThe

How to test for differential mode interference:

utilizationDifferential Common Mode Separator+Artificial Power NetworksDifferential mode interference voltages and currents can be tested.

Created Date: 2025-05-04 11:36:21 ;
Last modified on 2025-07-18 18:02:17 ;

/