Chapter 2
Using the NI 447X
2-4
ni.com
NI-DAQ documents and in the
NI-DAQ Function Reference Help
(
Start»Programs»National Instruments»DAQ»NI-DAQ Help
) for
more information.
Connecting Signals
The front panels of the NI PCI/PXI-4472 devices are shown in Figure 2-1,
and the NI PCI-4474 front panel is shown in Figure 2-2. There are eight
male SMB connectors on the front panel of the NI PCI/PXI-4472 and four
male SMB connectors on the front panel of the NI PCI-4474 for connecting
analog signals. Each NI 447
X
device also has one male SMB connector for
connecting a digital trigger. The analog inputs are unbalanced differential
channels with individually configurable AC/DC coupling and IEPE current
conditioning. The digital input can accept TTL/CMOS-compatible signals.
Note
To minimize noise and ensure more accurate measurements, do
not
allow the
connector shells of your SMB cables, SMB-to-BNC adapters, or BNC cables to touch each
other, the PCI-bus computer, or the PXI or CompactPCI chassis and controller.