民國107年 第3梯次 汽車修護甲級 學科
第66題
有關使用多功能數位電錶之安全事項,下列敘述何者正確?
題目
有關使用多功能數位電錶之安全事項,下列敘述何者正確?
- (1) Always insert the meter in the circuit in series for current measurements.
- (2) Always start measuring with the Ammeter on the highest scale and work your way down.
- (3) Always start measuring with the Voltmeter on the lowest scale and wor k your way down.
- (4) Never apply in a circuit of higher amperage than the meter is capable of measuri ng safely.
官方答案
(1) Always insert the meter in the circuit in series for current measurements.、(2) Always start measuring with the Ammeter on the highest scale and work your way down.、(4) Never apply in a circuit of higher amperage than the meter is capable of measuri ng safely.
解析
數位電錶量測電流時，電錶必須與電路串聯，讓電流實際流經電錶；若採並聯，會形成短路。選擇檔位時，電流檔應先選最高檔位再逐步往下切換，以免待測電流超過檔位而燒毀保險絲；電壓檔同樣應先選最高檔再往下修，因此「電壓先選最低檔」的說法錯誤。量測前還須確認電錶的額定電流與電壓，不得接入超過電錶安全量測能力的電路，否則可能產生電弧或燒傷。故1、2、4正確。
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