交流(ac)信号产生的电弧通常在电压通过零点时就会自己熄灭。
An arc due to an AC signal usually quenches itself as soon as the voltage level passes through zero.
仪器的零点读数也会随着环境温度的变化而变化。这种效应通常称为电压偏置温度系数。
The zero reading may also vary as the ambient temperature changes. This effect is usually referred to as the temperature coefficient of the voltage offset.
在电压源即将打开之前，关闭仪器的零点检查功能并使用REL功能抑制电荷读数，使显示为零。
Just before the voltage source is turned on, disable the meter's zero check and suppress the charge reading by using the REL function to zero the display.
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