Figure 2-2 – National Instruments Isolated Analog Input Device NI PXI-4224 User Manual

Page 16

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Chapter 2

Connecting Signals

NI PXI-4224 User Manual

2-4

ni.com

In the electrical diagrams, two different ground symbols are used. These
symbols indicate that you cannot assume that the indicated grounds are at
the same potential. Refer to Appendix A,

Specifications

, for maximum

working voltage specifications.

You can make signal connections to the NI PXI-4224 through either an
NI terminal block, such as the TB-2725, or you can build a connector using
a 25-pin D-SUB.

Caution

If you are building a 25-pin D-SUB connector for your application, make sure

you use a connector and signal wires that are safety rated for the voltage and category of
the signals in your application.

Figures 2-2 through 2-5 illustrate connecting signals using a D-SUB
connector.

Figure 2-2. Unshielded Floating Signal Source Connection Using a D-SUB Connector

+

Twisted-Pair

Wiring

AI 0 +

AI 0 –

CH 0

V

SIG

Signal Source

AI 7 +

AI 7 –

CH 7

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