描述
需要先調(diào)“正負(fù)平衡”再校準(zhǔn)的電壓表，應(yīng)先將其校準(zhǔn)開關(guān)置于“正負(fù)平衡”位置，調(diào)節(jié)“平衡”電位器，使表的正和負(fù)示值相等或在允許誤差范圍內(nèi)。然后將校準(zhǔn)開關(guān)置于校正位置，這時(shí)正負(fù)也應(yīng)保持平衡。如不平衡，應(yīng)反復(fù)調(diào)整使之平衡，并達(dá)到規(guī)定的校正電壓值。
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