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Chapter 1 Installing and Configuring the SCXI-1127/1128
© National Instruments Corporation 1-25 SCXI-1127/1128 User Manual
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.