当利用这一配置测量漏流时，通过每个继电器的常闭触点同时向所有的二极管施加偏压。
When measuring the leakage current with this setup, the voltage bias is applied to all the diodes simultaneously through the normally closed contact of each relay.
当没有通道被选中时，每组开关的第一个通道（常闭）被连接到一个输出端口。
When no channels are selected, the first channel of each bank, which is normally-closed, is connected to an output port.
原理：常闭型直动式电磁阀通电时，电磁线圈产生电磁吸力把阀芯提起，使关闭件离远开阀座密封副打开；
Principle: when the power is on, the electromagnetic force of the electromagnetic force to shut off the valve seat, the valve open;
原理：常闭型直动式电磁阀通电时，电磁线圈产生电磁吸力把阀芯提起，使关闭件离远开阀座密封副打开；
Principle: when the power is on, the electromagnetic force of the electromagnetic force to shut off the valve seat, the valve open;
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