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PXIe-4480/4481 Getting Started Guide
Caution
To ensure the specified EMC performance, operate this product only with
shielded cables and accessories.
Caution
To ensure the specified EMC performance, the length of all mini-XLR
cables must be no longer than 3 m (10 ft).
Caution
Electromagnetic interference can adversely affect the measurement
accuracy of this product when used with BNC cables. The construction of a BNC
coaxial cable is inherently unbalanced in that the outer conductor (LO) is used as a
shield for the inner conductor (HI). However, for functional reasons, there is no input
configuration of the PXIe-4480/4481 that directly connects the LO terminal to the
chassis ground. Without a direct connection to chassis ground, the outer conductor
does not act as a shield for unwanted noise and may act as an antenna for coupling
noise into the module inputs. For single-ended measurements, the noise immunity for
the system can be improved by directly connecting the outer conductor to the chassis
or earth ground at the load end of the cable. For differential measurements, where
such a connection is inherently not possible, the BNC cable can alternatively be
wrapped in a separate grounded shield. In addition, you might need to use snap-on
ferrite beads or other remedial measures to improve electromagnetic compatibility.
Unpacking the Kit
The PXIe-4480/4481 module ships in an antistatic package to prevent electrostatic discharge
from damaging module components.
Caution
To prevent electrostatic discharge from damaging the device, ground
yourself using a grounding strap or by holding a grounded object, such as your
computer chassis.
1.
Touch the antistatic package to a metal part of the grounded object before removing the
module from package.
2.
Remove the module from the package and inspect the module for loose components or any
other sign of damage.
Caution
Never touch the exposed pins of connectors.
Store the device in the antistatic package when the device is not in use. Notify NI if the module
appears damaged in any way; do not install a damaged device.
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