然后再开路该通道，随后可从另一个通道的读数中减去该值。

Then open this channel. This value can be subtracted from subsequent readings made on other channels.

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电源及能调节交流或直流电流在期望值的5%之内的，控制开路电压到最大20毫伏的路。

Power supply or circuit capable of regulating either alternating or direct current within 5% of desired value, and limiting the open circuit (source) voltage to 20 millivolts maximum.

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如果这些元件中的任何一个出现短路或开路，则8.1.4中规定的值不应被超过。

If any one of the components is short-circuited or open-circuited the values specified in 8.1.4 shall not be exceeded.

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