©
National Instruments Corporation
3
NI USB-9201/9221 User Guide and Specifications
Safety Guidelines
Operate the NI USB-9201/9221 only as described in these operating
instructions.
Caution
Although the NI 9201/9221 might have more stringent certification standards
than the NI USB-9201/9221, when used with the NI USB-9162 carrier, the combined
system might be limited. Refer to the
Hot Surface
This icon denotes that the component may be hot. Touching this component
may result in bodily injury.
Caution
Do
not
disconnect I/O-side wires or connectors unless power has been switched
off or the area is known to be nonhazardous.
Caution
Do
not
remove modules unless power has been switched off and the area is known
to be nonhazardous.
Caution
The NI USB-9201/9221 is
not
certified for use in hazardous locations.
Safety Guidelines for Hazardous Voltages
You can connect hazardous voltages to the NI USB-9201/9221 with the
screw terminal only. Do
not
connect hazardous voltages to the
NI USB-9201/9221 with D-SUB.
If
hazardous voltages
are connected to the module, take the following
precautions. A hazardous voltage is a voltage >42.4 V
pk
or 60 VDC to earth
ground.
Caution
Ensure that hazardous voltage wiring is performed only by qualified personnel
adhering to local electrical standards.
Caution
Do
not
mix hazardous voltage circuits and human-accessible circuits on the same
module.
Caution
Make sure that devices and circuits connected to the module are properly
insulated from human contact
Caution
When module terminals are live with hazardous voltages, make sure that the
terminals are
not
accessible by using the high voltage screw terminal backshell. Refer to
Assembling the High Voltage Screw Terminal Backshell
section for more information.
