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.
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.
在测量完成以后，7169A型的常闭接点使电容器放电。
The normally closed contact of the Model 7169A serves to discharge the capacitor after it has been measured.
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