描述
需要先调“正负平衡”再校准的电压表,应先将其校准开关置于“正负平衡”位置,调节“平衡”电位器,使表的正和负示值相等或在允许误差范围内。然后将校准开关置于校正位置,这时正负也应保持平衡。如不平衡,应反复调整使之平衡,并达到规定的校正电压值。
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