怎樣測擺動時間

Ⅰ 鍗曟憜瀹為獙涓錛岃灪姣嶆憜鍔ㄤ竴涓鏉ュ洖鐨勬椂闂村緢闅炬祴閲忥紝璇蜂綘甯灝忓崕璁捐′竴涓鏇村ソ鐨勬柟娉

嫻嬮噺鍏舵憜鍔20涓鏉ュ洖鐨勬繪椂闂達紝鐒跺悗鎶婃繪椂闂撮櫎浠20錛屼究寰楀埌浜嗗叾鎽嗗姩涓涓鏉ュ洖鐨勬椂闂撮噸澶嶆祴閲3嬈★紝鎶婂緱鍒扮殑閭3涓鎵嫻嬪緱涓涓鏉ュ洖鐨勬椂闂村姞鍦ㄤ竴璧鳳紝涔嬪悗鍐嶉櫎浠3錛屼究鑳藉緱鍒頒竴涓鏇翠負綺劇『鐨勬椂闂淬