National Instruments E Series - Manual (Page 18)

Chapter 1 Introduction
 National Instruments Corporation 1-5 DAQCard E Series User Manual
Optional Equipment
National Instruments offers a variety of products to use with your
DAQCard E Series card, including cables, connector blocks, and other
accessories, as follows:
• Cables and cable assemblies, shielded and ribbon
• Connector blocks, shielded and unshielded, with 50 and 68-pin
screw terminals
• SCXI modules and accessories for isolating, amplifying, exciting,
and multiplexing signals for relays and analog output. With SCXI
you can condition and acquire up to 3072 channels.
• Low channel-count signal conditioning modules, cards, and
accessories, including conditioning for strain gauges and RTDs,
simultaneous sample-and-hold circuitry, and relays
For more specific information about these products, refer to your
National Instruments catalogue or call the office nearest you.
Custom Cabling
National Instruments offers cables and accessories for you to prototype
your application or to use if you frequently change DAQCard
interconnections.
If you want to develop your own cable, however, the following
guidelines may be useful:
• For the analog input signals, shielded twisted-pair wires for each
analog input pair yield the best results, assuming that you use
differential inputs. Tie the shield for each signal pair to the ground
reference at the source.
• You should route the analog lines separately from the digital lines.
• When using a cable shield, use separate shields for the analog and
digital halves of the cable. Failure to do so results in noise coupling
into the analog signals from transient digital signals.