描述
電壓的測量將量程選擇開關(guān)的尖頭對準(zhǔn)標(biāo)有V的五檔范圍內(nèi)。若是測交流電壓則應(yīng)指向V處。依此類推,如果要改測電阻,開關(guān)應(yīng)指向檔范圍。測電流應(yīng)指向mA或UA。測量電壓時,要把電表表筆并接在被測電路上。根據(jù)被測電路的大約數(shù)值,選擇一個合適的量程位置。干電池每節(jié)最大值為1.5V,所以可放在5V量程檔。這時在面板上表針滿刻度讀數(shù)的500應(yīng)作5來讀數(shù)。即縮小100倍。如果表針指在300刻度處,則讀為3V。注意量程開關(guān)尖頭所指數(shù)值即為表頭上表針滿刻度讀數(shù)的對應(yīng)值,讀表時只要據(jù)此折算,即可讀出實值。除了電阻檔外,量程開關(guān)所有檔均按此方法讀測量結(jié)果。在實際測量中,遇到不能確定被測電壓的大約數(shù)值時,可以把開關(guān)先撥到最大量程檔,再逐檔減小量程到合適的位置。測量直流電壓時應(yīng)注意正、負(fù)極性,若表筆接反了,表針會反打。如果不知遭電路正負(fù)極性,可以把萬田表量程放在最大檔,在被測電路上很快試一下,看筆針怎么偏轉(zhuǎn),就可以判斷出正、負(fù)極性。
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