开路通道1,对其它所有通道重复以上步骤。
开路通道1,然后闭合通道2。验证通道2在规定的技术指标范围之内。
Open Ch. 1 and then close Ch. 2. Verify that Ch. 2 is within specification.
在闭合某个通道之前,必须确保其它所有的通道都是开路的,这非常重要。
It is particularly important to make certain all other channels are open before closing a particular channel.
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