National Instruments SCXI-1321 Connecting the Signals

Connecting the Signals

Note Refer to the Read Me First: Safety and Radio-Frequency Interference document

before removing equipment covers, or connecting or disconnecting any signal wires.

To connect the signal to the terminal block, complete the following steps,

referring to Figure 1 as necessary:

1. Unscrew the top-cover screws and remove the cover.

2. Loosen the strain-relief screws and remove the strain-relief bar.

3. Enable or bypass each of the nulling circuits, depending on the signal

you are measuring.

Note Disable the offset-nulling circuitry when you are not using a Wheatstone bridge or

when the excitation channel of the SCXI-1121 is in current mode.

4. Run the signal wires through the strain-relief opening. You can add

insulation or padding if necessary.

5. Prepare the signal wire by stripping the insulation no more than 7 mm

(0.28 in.).

6. Connect the wires to the screw terminals by inserting the stripped end

of the wire fully into the terminal. No bare wire should extend past the

screw terminal. Exposed wire increases the risk of a short circuit and a

hardware failure.

7. Tighten the screws to a torque of 0.57 to 0.79 newton-m (5 to 7 lb-in.).

8. Connect safety earth ground to the safety-ground lug. Refer to the

Read Me First: Safety and Radio-Frequency Interference document

for connection information.

9. Reinstall the strain-relief bar, and tighten the strain-relief screws.

10. Reinstall the top cover, and tighten the top-cover screws.

11. Connect the terminal block to the module front connector as explained

in the Installing the Terminal Block section.