Configuration and Installation Chapter 2SCXI-1120 User Manual 2-20 © National Instruments CorporationTable 2-8. Jumper Settings on the SCXI-1328 Terminal BlockJumper Position DescriptionW1 DTEMP MTEMP••••MTS mode selected; factorysetting; parking positionW1 ••••DTEMP MTEMPDTS mode selectedTerminal Block Signal ConnectionWarnings: The chassis GND terminals on your terminal block are for grounding highimpedance sources such as a floating source (1 mA maximum). Do not use theseterminals as safety earth grounds.If high voltages (≥42 Vrms) are present, you must connect the safety earth groundto the strain-relief tab. This complies with UL 1244 and protects against electricshock when the terminal block is not connected to the chassis. To connect thesafety earth ground to the strain-relief tab, run an earth ground wire in the cablefrom the signal source to the terminal block. National Instruments is not liable forany damages or injuries resulting from inadequate safety earth groundconnections.! Shock Hazard: This unit should only be opened by qualified personnel aware ofthe dangers involved. Disconnect all power before removing cover. Alwaysinstall grounding screw.To connect the signal to the terminal block, use the following procedure:1. Remove the grounding screw of the top cover.2. Snap out the top cover of the shield by placing a screwdriver in the groove at the bottom ofthe terminal block.3. Slide the signal wires, one at a time, through the front panel strain-relief opening. You canadd insulation or padding if necessary.4. Connect the wires to the screw terminals by wrapping the wires around the screws andtightening the screws without letting the wires slip out.5. Tighten the larger strain-relief screws.6. Snap the top cover back in place.7. Reinsert the grounding screw to ensure proper shielding.8. Connect the terminal block to the SCXI-1120 front connector as explained in the TerminalBlock Installation section later in this chapter.Figure 2-9 shows a parts locator diagram for the SCXI-1320 terminal block. Figure 2-10 showsa parts locator diagram for the SCXI-1328 terminal block.
