National Instruments NI 9481E manual 5

Each electromechanical relay channel has two interchangeable terminals, CHa and CHb.

Each channel has an LED that indicates the state of the channel. When a channel LED is lit, the channel is on. When the LED is dark, the channel is off. The LEDs are disabled when the chassis is in sleep mode. Refer to the Sleep Mode section for more information about sleep mode.

When connecting a load to the NI 9481E, connect the positive lead of the load to either the CHa or the CHb terminal, and the ground of the load to one of the leads of the power supply. Connect the remaining CHa or CHb terminal to the other lead of the power supply. Figure 3 shows a possible configuration.

CHa

CHb

NI 9481E

+

or

–

LoadAC

Figure 3. Connecting a Load to the NI 9481E

© National Instruments Corp. 5 NI 9481E Operating Instructions and Specifications