National Instruments NI 9401, Manual

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Install a clamp-on ferrite bead (782803-01) on the cable that you are
connecting to NI 9401.
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The clamp-on ferrite bead must be connected to the cable as close to the
module as possible. Placing the ferrite elsewhere on the cable noticeably
impairs its effectiveness.
Figure 1.
Installing a Ferrite Bead
1 2
1. Installing a ferrite bead on a 25-pin DSUB cable.
2. Installing a ferrite bead on the cable of the terminal block.
Special Conditions for Marine Applications
Some products are Lloyd’s Register (LR) Type Approved for marine (shipboard)
applications. To verify Lloyd’s Register certification for a product, visit ni.com/
certification and search for the LR certificate, or look for the Lloyd’s Register mark
on the product.
Caution
In order to meet the EMC requirements for marine applications,
install the product in a shielded enclosure with shielded and/or filtered
power and input/output ports. In addition, take precautions when
designing, selecting, and installing measurement probes and cables to
ensure that the desired EMC performance is attained.
Preparing the Environment
Ensure that the environment in which you are using the NI 9401 meets the following
specifications.
Operating temperature
(IEC 60068-2-1, IEC 60068-2-2)
-40 °C to 70 °C
Operating humidity (IEC 60068-2-78) 10% RH to 90% RH, noncondensing
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NI-9401