National Instruments NI 9481

NI 9481 Operating Instructions and Specifications 8 ni.com

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 NI9481, 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. Figure3 shows a possible configuration.

Figure 3. Connecting a Load to the NI 9481

NI 9481

–

CHa

CHbAC

Load