继电器驱动电流激励继电器所需的电流总量。通常以每通道给出。
Relay Drive Current. The amount of current necessary to energize a relay. Usually specified per channel.
闭锁继电器采用了一个电流脉冲进行激励，因此其热电漂移非常小。
Latching relays use a pulse of current to actuate them, so they have very low thermoelectric drift.
如果采用类似7013型继电器开关卡这样的开关卡，通道2通常是加激励的。
If using a card such as the Model 7013 Relay Switch card, ch. 2 is normally energized.
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