Operation can be conducted after the indicating value of direct current voltmeter of the panel is zero.
待面板的直流电压表的指示值为0时方可进行操作。
DC voltmeter PA2: the secondary DC current exported by indicating device.
直流电压表pa 2：指示设备输出的二次侧直流电流。
DC voltmeter PA2: the secondary DC current exported by indicating device.
直流电压表pa 2：指示设备输出的二次侧直流电流。
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