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SCXI-1335 Terminal Block Installation Guide
4
ni.com
When using the device with high common-mode voltages, you
must
insulate your signal
wires for the highest input voltage. National Instruments is
not
liable for any damages or
injuries resulting from inadequate signal wire insulation. Use only 26-20 AWG wire with
a minimum voltage rating of 150 V and a temperature value of 60 °C for measuring up
to 150 V.
When connecting or disconnecting signal lines to the SCXI terminal block screw terminals,
make sure the lines are powered off. Potential differences between the lines and the SCXI
ground can create a shock hazard while you connect the lines.
Connections, including power signals to ground and vice versa, that exceed any of the
maximum signal ratings on the SCXI device can create a shock or fire hazard, or can
damage any or all of the boards connected to the SCXI chassis, the host computer, and the
SCXI device. National Instruments is
not
liable for any damages or injuries resulting from
incorrect signal connections.
If hazardous voltages (
≥
30 V
rms
and 42.4 V
peak
or 60 VDC) are present, you
must
connect
a safety earth-ground wire to the terminal block safety-ground lug, shown in Figure 1.
This complies with safety agency requirements and protects against electric shock when
the terminal block is not connected to the chassis. To connect the safety earth-ground to
the safety-ground lug, run an earth-ground wire 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 lug hardware when connecting the
safety-ground wire; to do so reduces the safety isolation between the high voltage and
safety ground.
Clean the module and accessories by brushing off light dust with a soft non-metallic brush.
Remove other contaminants with a stiff non-metallic brush. The unit
must
be completely
dry and free from contaminants before returning it to service.
The terminal block
must
be used with a UL-listed SCXI chassis.
Unpacking
Your SCXI-1335 terminal block is shipped in an antistatic package to
prevent electrostatic damage to the terminal block. Electrostatic discharge
can damage several components on the terminal block. To avoid such
damage in handling the terminal block, take the following precautions:
•
Ground yourself using a grounding strap or by holding a grounded
object.
•
Touch the antistatic package to a metal part of your computer chassis
before removing the terminal block from the package.