National Instruments NI 9481E - Manual (Page 5)

© National Instruments Corp. 5 NI 9481E Operating Instructions and Specifications
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.
Figure 3. Connecting a Load to the NI 9481E
NI 9481E
+
–
CHa
CHb
AC
or
Load