{"type":"product","schema_version":"1.0","item_id":"100092388239","canonical_url":"https://tw.bid.yahoo.com/item/100092388239","title":"【大台北液晶維修】高精度 0~100A  LED數字電流表 供電4V-30V  帶分流器","subtitle":null,"condition":"全新品","currency":"TWD","observed_at":"2026-07-27T00:16:54.687Z","current_price":350,"original_price":null,"stock_status":"in_stock","available_quantity":9,"sold_quantity":1,"seller":{"id":"Y9358969786","name":"大台北地區液晶電視電腦螢幕維修","positive_rate":null,"rating_count":null},"images":[{"url":"https://img.yec.tw/ob/image/f92a2e6b-a2c8-496e-9445-f63daa2f7694.jpg","role":"main","alt":"商品主圖","width":null,"height":null},{"url":"https://img.yec.tw/ob/image/6e0a3318-4322-44d9-9c2e-8a8a9f68f4d0.jpg","role":"detail","alt":"商品圖片 2","width":null,"height":null},{"url":"https://img.yec.tw/ob/image/41ee23f0-aabb-4a94-bf38-b123a0c03282.jpg","role":"detail","alt":"商品圖片 3","width":null,"height":null}],"description":"此電流表供電範圍寬DC4V-30.0V，帶反接保護，防止反接燒壞；配100A/75mV分流器，接線方便； 體積小巧，外形美觀，方便安裝。\n\n出廠前用專用設備將表頭與分流器配套校准保證了電流表極高的準確度精度遠遠超過那些（表頭+分流器）沒校準的廠家\n\n電流表基本性能參數如下：\n\n開口尺寸 ：45.5mm*26.5mm\n\n外形尺寸 ：48mm*29mm*21mm\n\n電流表量程：DC0-99.9A\n\n供電電壓 :DC4-30V2線接入\n\n重 量 ：23克/只（表頭重量） \r\n\n分流器\n要測量一個很大的直流電流，例如幾十安培，甚至更大，幾百安培，沒有那麼大量程的電流表進行電流的測量，怎麼辦？這就要採用分流器。分流器是一個可以通過大電流的精確電阻，當電流流過分流器時，在它的兩端就會出現一個毫伏級的電壓，於是用毫伏電壓表來測量這個電壓，再將這個電壓換算成電流.就完成了大電流的測量。電流表有多種不同規格，但是實際表頭卻是標準的毫伏電壓表。比如是一種滿刻度為75mv的電壓表。那麼用這塊電壓表測量比如20A的電流，就需要給它配一個在流過20A電流時候產生75mv電壓降的分流電阻，也稱75mv分流器。分流器就是一個能夠通過極大電流的電阻一般常用的15A或20A以及35A的電流表都需要分流器，分流器的阻抗=表頭標誌滿度電壓/表頭滿度電流。比如20A的電流表的分流器阻值=75mv/20A=0.00375Ω，阻抗恆定後根據歐姆定律U=IR，電流與電壓成正比，電流為線形電壓也呈線形，所以就可以用一個滿度為75mv的電壓表顯示當前電流。因此，使用的電流表實際是一塊電壓表。","shipping_methods":[{"name":"7-ELEVEN取貨付款","fee":0,"currency":"TWD"},{"name":"郵局掛號","fee":0,"currency":"TWD"},{"name":"面交/自取/不寄送","fee":0,"currency":"TWD"}],"lowest_shipping_fee":null,"payment_methods":["ATM轉帳","7-ELEVEN取貨付款"],"category_id":"2092104745","category_name":"電表/儀表","breadcrumb":[{"id":"24198","name":"居家、家具與園藝","url":"/tw/%E5%B1%85%E5%AE%B6%E3%80%81%E5%AE%B6%E5%85%B7%E8%88%87%E5%9C%92%E8%97%9D-24198-category.html"},{"id":"24642","name":"五金/照明工具","url":"/tw/%E4%BA%94%E9%87%91-%E7%85%A7%E6%98%8E%E5%B7%A5%E5%85%B7-24642-category.html"},{"id":"2092104745","name":"電表/儀表","url":"/tw/%E9%9B%BB%E8%A1%A8-%E5%84%80%E8%A1%A8-2092104745-category.html"}],"view_count":0,"watch_count":5}