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© National Instruments Corporation

National Instruments for service and repair to ensure that its safety features are not 
compromised.

When using the terminal block with high common-mode voltages, you must insulate your 
signal wires appropriately. National Instruments is not liable for any damages or injuries 
resulting from inadequate signal wire insulation.

Connections, including power signals to ground and vice versa, that exceed any of the 
maximum signal ratings on the SCXI-1127/1128 can damage any or all of the modules 
connected to the SCXI chassis, the host computer, and the SCXI-1127/1128 module. 
National Instruments is not liable for any damages or injuries resulting from incorrect 
signal connections.

If high voltages (

≥

    30 V

rms

 and 42.4 V

peak

, or 60 VDC) are present, you must connect safety 

earth ground to the strain-relief tab of the terminal block. This maintains compliance with 
UL 3111 and IEC-61010, and protects against electric shock when the terminal block is not 
connected to the chassis. To connect the safety earth ground to the strain-relief tab, run an 
earth ground wire in the cable from the signal source to the terminal block. National 
Instruments is not liable for any damages or injuries resulting from inadequate safety earth 
ground connections.

Do not loosen or re-orient the safety ground solder lug hardware when connecting the 
safety ground wire; to do so reduces the safety isolation between the high voltage and 
safety ground.