Chapter 1 Getting Started
© National Instruments 1-3 X Series User Manual
Getting Started with X Series USB Devices
The following sections contain information about X Series USB device
best practices and features.
USB Device Chassis Ground
Note (NI USB-636x Mass Termination Devices) X Series USB Mass Termination devices have
chassis ground connection through the I/O connector.
(NI USB-634x/635x/636x Screw Terminal Devices) For EMC compliance, the
chassis of the X Series USB Screw Terminal device must be connected to
earth ground through the chassis ground.
The wire should be AWG 16 or larger solid copper wire with a maximum
length of 1.5 m (5 ft). Attach the wire to the earth ground of the facility’s
power system. For more information about earth ground connections, refer
to the KnowledgeBase document, Earth Grounding for Test and
Measurement Devices, by going to
ni.com/info and entering the Info
Code
earthground.
You can attach and solder a wire to the chassis ground lug of the X Series
USB device, as shown in Figure 1-1. The wire should be as short as possible.
Figure 1-1. Grounding an NI USB-634x/635x/636x Screw Terminal Device through
the Chassis Ground Lug
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